If you found this hash in a breach data dump, change any related passwords immediately. If it’s part of a file, scan that file with updated antivirus. If it’s from a CTF challenge, try reversing it with hashcat and the rockyou.txt list – sometimes the answer is simpler than it seems.
Ensuring an operating system image is not corrupted before burning to USB.
ImageMagick can also strip or replace the embedded profile. 9d91003d4080b03d40742c819ea5228e full
The string 9d91003d4080b03d40742c819ea5228e is a 32‑character hexadecimal value. On first glance it resembles an MD5 or SHA‑1 cryptographic hash – a digital fingerprint that uniquely identifies an input of any length and returns a fixed‑size output. Like the MD5 hash of the word “password” yields 5f4dcc3b5aa765d61d8327deb882cf99 , this hash may be used to validate file integrity, encrypt sensitive data, or generate unique identifiers. However, a deeper investigation reveals that this sequence is not merely a hash of a user password or a file checksum; it functions as a Profile ID inside an ICC (International Color Consortium) color profile.
When analyzing the full structural footprint of an image containing this specific profile ID, forensic platforms read a defined matrix of color coordinates. A full extract of this profile yields the following technical matrix: Metadata Field Parameter Value / Coordinate Connection Space Illuminant 0.9642, 1, 0.82491 Rendering Intent Perceptual Media White Point 0.9505, 1, 1.089 Red Matrix Column 0.43604, 0.22244, 0.0139 Green Matrix Column 0.3851, 0.71693, 0.09708 Blue Matrix Column 0.14307, 0.06062, 0.71393 If you found this hash in a breach
To understand this exact string, you must look at how modern computers process color. The string is an MD5-like unique identifier for an International Color Consortium (ICC) device profile. Specifically, it maps directly to the following technical architecture: uRGB (Universal RGB Color Space) Profile Class: Display Device Profile Color Space Data: RGB Primary Platform: Microsoft Corporation Profile Connection Space (PCS): XYZ Profile Copyright: CC0 (Creative Commons Public Domain)
In cybersecurity and multimedia forensics, investigators use metadata extractors to review the structural blocks of an image file. The presence of this specific Profile ID tells a forensics expert several vital things about the history of the file: 1. Verifying Source Cameras and Devices Ensuring an operating system image is not corrupted
The hash 9d91003d4080b03d40742c819ea5228e is a unique for an ICC color profile known as uRGB . It acts as a digital fingerprint within image metadata, signaling that an image has likely been processed or saved using specific software like Adobe Photoshop or Lightroom, rather than being a "raw" file straight from a camera.
exiftool -icc_profile -b image.jpg > extracted.icc