Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ac490ea421ce6d6…

MALICIOUS

PDF

50.6 KB Created: 2021-03-29 18:20:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd307a0dfe4b1966bc0c943db78c3dbc SHA-1: f5472aa6d5f2d4bedc273191eb46a3f24f3ccd5e SHA-256: 3ac490ea421ce6d65e2ce99f264a5d8a6347f0488ea147a460e945e52da489c6
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by multiple heuristics and ClamAV, indicating it's 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. The document's structure and content, including the presence of embedded URLs, strongly suggest it is designed to trick users into clicking through to a compromised or malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8343

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 50 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://jottigo.ru/aws?utm_term=lirr+train+schedule+port+washington+to+penn+station
    • http://ses-sanobrabotka.ru/national_rail_senior_railcard_application_formek2lq.pdf
    • https://static.s123-cdn-static.com/uploads/4447915/normal_5fdee4bc5d7a3.pdf
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    • http://milanomoda.site/your_grace_is_enough_lyrics_and_chords_key_of_g20xui.pdf
    • https://static.s123-cdn-static.com/uploads/4401691/normal_6006314957da5.pdf
    • https://cdn-cms.f-static.net/uploads/4415937/normal_604b63b300597.pdf
    • https://cdn-cms.f-static.net/uploads/4416660/normal_600fdeee4e96d.pdf
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    • http://ppl-nutrshopfit.website/63131659173rqmxo.pdf
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    • https://d102a0f2-001f-4998-bb0a-88ac30ac05b5.filesusr.com/ugd/771ea4_37352971405c4c2c995d2cd9db96f2d6.pdf?index=true
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    • https://ea0a6730-5b47-42bc-899c-5b27b21b32ea.filesusr.com/ugd/184298_45baffd0225a44b4bbcaef6ef46cf6ac.pdf?index=true
    • https://c84d532c-3b33-47d6-96aa-4134a1164eb1.filesusr.com/ugd/6d45f6_4421881de5fc4fe3a42e8a1aa4d9649c.pdf?index=true
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