Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f4636120a05bc6c…

MALICIOUS

PDF

37.6 KB Created: 2021-01-28 12:48:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5afd0631f47d4ab421820c90ec673de SHA-1: 3b161487483dac9e4bd61082d076d95cf08b2fae SHA-256: 5f4636120a05bc6cabf3ff5814285d3f11c5d6e1e52506fdff5abf57f71e55da
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ClamAV and ML classifiers, and exhibits characteristics of a phishing lure. It contains a large number of external links, many hosted on disposable domains, suggesting an attempt to redirect users to malicious sites or download further malware. The document body is heavily obfuscated, but the presence of embedded URLs and the overall structure point towards a malicious intent, likely related to spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6482

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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 37 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://crophysi.ru/aws?utm_term=microsoft+excel+checklist+template
    • http://xavolavuduxi.22web.org/fofokugodiruvarowebu.pdf
    • https://bujetukojijem.weebly.com/uploads/1/3/4/8/134875379/6711625.pdf
    • https://cdn-cms.f-static.net/uploads/4449424/normal_5fe6d37602132.pdf
    • https://jowakalol.weebly.com/uploads/1/3/4/4/134480841/jufulutur.pdf
    • https://nisixokavenofaf.weebly.com/uploads/1/3/4/8/134891603/3834897.pdf
    • https://xukizawumu.weebly.com/uploads/1/3/1/3/131380236/rosekatuxire.pdf
    • https://zonujonuwug.weebly.com/uploads/1/3/4/3/134309714/d36c76fc81c7.pdf
    • https://static.s123-cdn-static.com/uploads/4483088/normal_5fddda23ef5d8.pdf
    • https://cdn-cms.f-static.net/uploads/4476578/normal_5fe96262cbf94.pdf
    • http://bavigozobuk.rf.gd/51390949145.pdf

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