Malicious PDF — malware analysis report

Static analysis result for SHA-256 5646a2e15cc90359…

MALICIOUS

PDF

79.0 KB Created: 2021-04-01 17:09:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 674aad4e694e645df4f91e9d880937df SHA-1: fba5c083ebb1b2189de051441517653a91c957f4 SHA-256: 5646a2e15cc90359972f9dc5e9ae54f25124bcb52d5e98e53eaac07b3cfb7bee
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF contains a malformed exploit stream and numerous external links, indicating it is part of a link farm designed to redirect users to malicious content. The primary URL, https://lozipotod.ru/award?keyword=superlative+adjectives+games+pdf, suggests a phishing or scam attempt by disguising malicious links within seemingly innocuous content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9491

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://lozipotod.ru/award?keyword=superlative+adjectives+games+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417815/normal_600bd30c7c3f4.pdfIn PDF document text
    • https://munuteme.weebly.com/uploads/1/3/4/8/134862418/kudim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467036/normal_5fd2adcad23c9.pdfIn PDF document text
    • https://lasezafokovopar.weebly.com/uploads/1/3/5/2/135294620/5636186.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402963/normal_6016e2579261c.pdfIn PDF document text
    • https://fipugodegiposal.weebly.com/uploads/1/3/4/6/134687615/8705777.pdfIn PDF document text
    • https://sazavilekin.weebly.com/uploads/1/3/4/8/134851962/3844968.pdfIn PDF document text
    • https://tegugozitofo.weebly.com/uploads/1/3/0/8/130874592/sidafate.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367283/normal_5fd6778ee3e75.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403119/normal_5ffed346c143a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423752/normal_604864fa4ee5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409796/normal_6057a4342f3ba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460043/normal_5feb6fc82313a.pdfIn PDF document text
    • https://vumevomuw.weebly.com/uploads/1/3/4/3/134335884/rugabogolos.pdfIn PDF document text
    • https://pebezudaxefen.weebly.com/uploads/1/3/4/3/134347708/4630818.pdfIn PDF document text
    • https://liletalezawo.weebly.com/uploads/1/3/4/5/134591830/xazefutuzalef.pdfIn PDF document text
    • https://nilowebun.weebly.com/uploads/1/3/4/7/134751503/9866076.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416514/normal_6025fee5b7d43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483071/normal_602f763067936.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458615/normal_605bf93ded98f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6151e78-2ef7-46f8-a78d-5a38977340dd/how_to_read_choicemmed_fingertip_pulse_oximeter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4509a055-7649-4a28-bdf2-ce6307042c2e/64439188589.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8F 5716 bytes
SHA-256: 27ca49955685c726e67672183ea2d4edcb6508fdca9be5be0b97e5f6841f62f7

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