IcedID — PDF malware analysis

Static analysis result for SHA-256 1796aef0940e800b…

MALICIOUS

PDF

157.8 KB Created: 2023-01-10 07:56:28 -08:00 Authoring application: iTextSharp’ 5.5.13.2 ©2000-2020 iText Group NV (AGPL-version)
MD5: 64b2a2c9feb643ae90639aa50158dfd9 SHA-1: e9e1a506fc44ac015e35fca6988385e4d134d0c2 SHA-256: 1796aef0940e800bcb2556782f92a7874422bbdfdda24e6658e43db4b0916850
172 Risk Score

Malware Insights

IcedID · confidence 95%

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, typical for phishing, with heuristics indicating repeated invisible links designed to deliver a payload. ClamAV detection and ML classification confirm its malicious nature, specifically identifying it as IcedID. The primary IOC is the URL used to host the malicious ZIP payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9601

Heuristics 4

  • Invisible/repeated PDF links deliver payload file critical PDF_REPEATED_PAYLOAD_LINK_LURE
    PDF uses invisible link annotations and points to a direct payload download. Repeated invisible links or lure-like payload names such as document/unlock/verify archives match malware-delivery PDF carriers where the page is only a prompt and the real payload is fetched from the linked URL.
  • ClamAV: Pdf.Trojan.IcedID-9983378-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Trojan.IcedID-9983378-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 2 image(s), only 0 text block(s), carries a click-outward action, and is only 157 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://firebasestorage.googleapis.com/v0/b/plenary-matrix-372414.appspot.com/o/Oov7gezL7D%2Frequest_01-10_INV-171.zip?alt=media&token=9366b044-ff35-46d4-8371-06712d585093

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