Qakbot — PDF malware analysis

Static analysis result for SHA-256 f27161f72a8731fb…

MALICIOUS

PDF

89.8 KB Created: 2023-02-22 14:44:24 +00:00 Authoring application: dompdf 2.0.3 + CPDF
MD5: 961f36b0d20d67441a9d7dfb1c75cfbd SHA-1: 2a363d9daeddf3a415a0965be91a9550561d6739 SHA-256: f27161f72a8731fbf5297a0043b6273e1342fc8d660688e114c59c3c65d2bd62
82 Risk Score

Malware Insights

Qakbot · confidence 95%

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

The PDF file is identified as an image-only document with an action trigger, a common technique for phishing lures. ClamAV detection confirms it as Pdf.Downloader.Qakbot-9989703-0. The embedded URL, https://zuericherblatt.com/RRE.php, is likely used to deliver the next stage of the attack, consistent with Qakbot's typical behavior of downloading and executing additional payloads.

Machine Learning

  • Nyx PDF Classifier clean score 0.0452

Heuristics 4

  • ClamAV: Pdf.Downloader.Qakbot-9989703-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Downloader.Qakbot-9989703-0
  • 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 89 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://zuericherblatt.com/RRE.php

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