Qakbot — PDF malware analysis

Static analysis result for SHA-256 ce0b6e49d017a570…

MALICIOUS

PDF

89.2 KB Created: 2023-03-11 03:17:32 +00:00 Authoring application: dompdf 2.0.3 + CPDF
MD5: dd27c04bc998f69467c2c81c53a111ab SHA-1: 3e09fbba03859f0b59059e160109d5a6929182e7 SHA-256: ce0b6e49d017a570bdaa463e51893014a7378fb4586e33fabbc6c4832c355663
82 Risk Score

Malware Insights

Qakbot · confidence 95%

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file is identified as an image-only lure, a common tactic for phishing or malware distribution. ClamAV explicitly detects it as Pdf.Downloader.Qakbot, strongly suggesting Qakbot family involvement. The embedded URL http://gurtek.com.tr/exi/exi.php is likely used to host or redirect to a malicious payload. The heuristics indicate a click-outward action, reinforcing the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier clean score 0.0537

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 1 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 http://gurtek.com.tr/exi/exi.php

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