Malicious PDF — malware analysis report

Static analysis result for SHA-256 f41c267a3ce42b09…

MALICIOUS

PDF

78.2 KB Created: 2021-03-05 22:46:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8ebe7347b4191b22d3de8665ddee757d SHA-1: d1ea0b79e460fec1cdf3eb9154f79f0700f46e2f SHA-256: f41c267a3ce42b09dbd9b970f55ef4ca54da0fb4c3930a8b7eb7c9a82249a355
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • 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://dugedepap.ru/wix?keyword=difference+between+spanish+and+british+colonization PDF link annotation
    • https://cdn.sqhk.co/kepozote/djctjhb/picotin_18_price_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/jovowosifo/hcjJ9ih/96433722332.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408190/normal_601c67d1239bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417519/normal_5fd38aa5b8b71.pdfIn PDF document text
    • https://cdn.sqhk.co/pigexebobe/EvJieZH/xudotenemoxaligaxuguzed.pdfIn PDF document text
    • https://cdn.sqhk.co/wesuwajil/frjehab/sigasulut.pdfIn PDF document text
    • https://cdn.sqhk.co/fiseguvugele/hegjXjj/7241135831.pdfIn PDF document text
    • https://cdn.sqhk.co/tenokesime/hege2ih/pizza_chef_florence_alabama_phone_number.pdfIn PDF document text
    • http://zitokik.iblogger.org/lobitokuxexunexeziw.pdfIn PDF document text
    • https://cdn.sqhk.co/nobukomorur/kRRjfih/shadow_fight_film.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404755/normal_602f5f9371e12.pdfIn PDF document text
    • http://xuforaxi.22web.org/idsa_guidelines_uti_uncomplicated.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393632/normal_60400347e2dfa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488339/normal_5feb922fcdd7d.pdfIn PDF document text
    • https://cdn.sqhk.co/putizimetiwe/wheugdd/sword_knights_ghost_hunter_idle_rpg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cf336f9a-6a79-4542-9269-5b62d6eb69dd.filesusr.com/ugd/1daf83_0e30d49ca54e42fd8cdd951d263b5980.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/ladupujikiwupefukojagemu.pdfIn PDF document text
    • http://wevosana.rf.gd/navy_seals_training_facility.pdfIn PDF document text
    • https://s3.amazonaws.com/miledu/37448615586.pdfIn PDF document text
    • http://miruwofewap.rf.gd/xiruragatidedonesakuv.pdfIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/bolo_de_cenoura_simples_forma_grande.pdfIn PDF document text
    • https://8e8ef6ac-913c-489f-8395-c30730e7ba0a.filesusr.com/ugd/f39c52_1eb265a4330a4343b51b97c9e383eec9.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF468 5524 bytes
SHA-256: b9102f3e3c631a62cd92e63066abb364c596a8f067d20d96c1fb77bc79026373
font_01_sfnt_off00010747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10747 9936 bytes
SHA-256: 61bd3f9bd6afcd66a19e32cff9a4fdeb3215ec161723d0a46e1b662b22d03b17

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