IcedID — PDF malware analysis

Static analysis result for SHA-256 c118816fa2545af9…

MALICIOUS

PDF

104.9 KB Created: 2023-01-16 08:31:30 -08:00 Authoring application: iTextSharp’ 5.5.13.2 ©2000-2020 iText Group NV (AGPL-version)
MD5: 2ca8a95954a9b6e2e36cb8ce0fe87525 SHA-1: dad0eb40919abd5cc88adf764d7120c107afbed0 SHA-256: c118816fa2545af9989e8f4d5a444e4ad65925ed4fb1e63bf5710dadd0216c9d
170 Risk Score

Malware Insights

IcedID · confidence 95%

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF is identified as malicious by ClamAV and an ML classifier, and heuristics indicate it's an image-based lure with repeated, invisible links. One such link points to a payload URL that likely delivers the IcedID banking trojan. The PDF's structure and the presence of a downloadable ZIP archive strongly suggest a phishing or social engineering attack.

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 104 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/amiable-bonus-372413.appspot.com/o/cea7AhDeUu%2FDocument-625.zip?alt=media&token=c91f2ff0-762e-4992-935f-c53c70764498