Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcf5a7d4b6d47364…

MALICIOUS

PDF

40.1 KB Created: 2021-04-02 00:41:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ef206cc2274411690504f44d75f5b7c8 SHA-1: d76e8ef4e523a030fe3ba44475ab79ec7c9fec8c SHA-256: bcf5a7d4b6d4736411228243730f20093e69f43a963e5bb54f74131f5a120a1f
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF employs an image-only lure, a common phishing tactic, to entice users to click on embedded links. Heuristics indicate it's a link farm hosted on disposable infrastructure, suggesting a malicious intent to redirect users. ClamAV detection and ML classification further support its malicious nature, likely serving as a dropper or redirector to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8020

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 40 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://bologen.ru/award?keyword=connectors+in+english+grammar+pdf PDF link annotation
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    • http://dimozakebaba.scienceontheweb.net/90724792649.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369771/normal_6018c295777c1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407100/normal_5ffc1af596040.pdfIn PDF document text
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    • http://makebugobiwuka.mypressonline.com/cardiac_rehabilitation_guidelines_2020.pdfIn PDF document text
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    • http://kewokuxumuzig.medianewsonline.com/biology_paper_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/walter_benjamin_the_work_of_art_in_the_age_of_mechanical_reproduction.pdfIn PDF document text
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    • https://uploads.strikinglycdn.com/files/60ba33f7-6485-409c-924a-4c2e22ba7746/louis_lamour_sackett_series_in_order.pdfIn PDF document text
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    • https://s3.amazonaws.com/waxegatulo/fubalomiweduxowex.pdfIn PDF document text
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