Malicious PDF — malware analysis report

Static analysis result for SHA-256 103f6a0480464903…

MALICIOUS

PDF

70.8 KB Created: 2021-06-04 20:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be6a3025f1f306bcd088babe8b7b9f89 SHA-1: 7a19457d223fef6c29aa921c931dfa8ae453e0cd SHA-256: 103f6a0480464903f7fe60b080f778b037ba77650b06d6e6d66ddbba14cdbba6
126 Risk Score

Malware Insights

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

The PDF document contains numerous external links, with one prominent URL pointing to 'crewmak.ru' and a query parameter suggesting a service manual lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, further supporting a phishing or malicious redirection scheme. Although no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://crewmak.ru/pbw?utm_term=onida+ultra+slim+tv+service+manual
    • https://static.s123-cdn-static.com/uploads/4417306/normal_600819e8a48e8.pdf
    • https://cdn-cms.f-static.net/uploads/4459175/normal_60258dd2c958a.pdf
    • https://cdn-cms.f-static.net/uploads/4491414/normal_60b97170cb74e.pdf
    • https://cdn-cms.f-static.net/uploads/4454988/normal_606b55400f235.pdf
    • https://static.s123-cdn-static-d.com/uploads/4466151/normal_60b3d24b1685c.pdf
    • https://cdn-cms.f-static.net/uploads/4477649/normal_605048ab9a25d.pdf
    • https://static.s123-cdn-static-d.com/uploads/4481156/normal_60b198465f6c6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zikupuzajix.pbworks.com/w/file/fetch/144573819/lojeziguzokiso.pdf
    • https://uploads.strikinglycdn.com/files/f8493fec-275f-4dc1-b7cf-b9ce5bc4cbe7/trane_cleaneffects_collection_cells_cleaning.pdf
    • http://munonoraze.pbworks.com/w/file/fetch/144609246/39408707764.pdf
    • http://tekitejug.pbworks.com/w/file/fetch/144568425/reresafekufenufel.pdf
    • http://rupebaxo.pbworks.com/w/file/fetch/144598848/how_long_does_it_take_to_breed_legendary_monster_legends.pdf
    • https://uploads.strikinglycdn.com/files/894af39c-aa91-4175-8a40-a8c9e4d1d680/taromaw.pdf
    • https://uploads.strikinglycdn.com/files/76b3f035-deb0-4093-8251-64e81f0fd1b8/novodoj.pdf
    • https://uploads.strikinglycdn.com/files/83bf536d-cf63-42aa-8c73-34e8e925a865/difidadudunazemobuxuguv.pdf
    • http://funuvutidip.pbworks.com/w/file/fetch/144461532/kugajeduworewatasowixa.pdf
    • http://nafidob.pbworks.com/f/ruwiwalovabegixuwonur.pdf
    • http://dadilotofexi.pbworks.com/w/file/fetch/144505047/pejunojulovokadifa.pdf
    • https://uploads.strikinglycdn.com/files/6dee05a5-0853-43c8-a727-27c8c40503f8/ledafisivelugejewi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8e1.bin
b321f5fea96cd5dfa8c81ed84907c60ed5196e5dd38733b7a9e8acada15c1b99		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E1 5172 bytes
font_01_sfnt_off0000ea67.bin
d4ddc74f755016ab1ac4a11589d720469176843d5bed8ae3c5cfaf083e7812fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA67 10412 bytes

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