IcedID — PDF malware analysis

Static analysis result for SHA-256 c2e3097e2de547d7…

MALICIOUS

PDF

109.3 KB Created: 2023-01-16 08:29:14 -08:00 Authoring application: iTextSharp’ 5.5.13.2 ©2000-2020 iText Group NV (AGPL-version)
MD5: 5f8a9cb690464151bb443ed4740a3c27 SHA-1: e467d01dd6810da100fb2b96fc30f2d33a205602 SHA-256: c2e3097e2de547d70f1d4543b51fdb0c016a066646e7d51b74ca4f29c69f5a85
170 Risk Score

Malware Insights

IcedID · confidence 95%

MITRE ATT&CK
T1566.002 Spearphishing Attachment

The PDF is an image-only lure designed to trick the user into clicking an invisible link. This link repeatedly points to a ZIP file hosted on Google Firebase Storage. ClamAV identifies this as Pdf.Trojan.IcedID, and the ML classifier also flagged it as malicious. The primary attack vector is the delivery of a payload via a malicious link embedded within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8365

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 1 image(s), only 0 text block(s), carries a click-outward action, and is only 109 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/atlantean-field-372418.appspot.com/o/vnnaLMV3ii%2FDocument-2325.zip?alt=media&token=3eb21a6e-77b3-453c-a091-cae359354173

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