Malicious PDF — malware analysis report

Static analysis result for SHA-256 756688d82cef81cc…

MALICIOUS

PDF

57.3 KB Created: 2021-04-01 00:29:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b42a23eddd07ce3b4ba3195ba077be84 SHA-1: b50378098d972e50af138b8ea8b5951d46cd0bdc SHA-256: 756688d82cef81cc7277467c830cca5702f818eb2a92023ee118ab746afae202
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It employs an image-only lure, a common tactic to disguise clickable links. The document contains numerous embedded URLs, with one prominent URL leading to a suspicious domain, likely serving as a phishing or malware distribution point. The presence of multiple disposable domains and UTM parameters suggests a broad phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5074

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 57 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://golowaki.ru/strik?utm_term=why+isn%2527t+my+left+skullcandy+bluetooth+headphones+connect
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