Malicious PDF — malware analysis report

Static analysis result for SHA-256 77d9eee3bce845e2…

MALICIOUS

PDF

82.9 KB Created: 2021-03-21 09:19:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e59ad315676b351c25e52504bea9a985 SHA-1: d0dd860f73630ab4dc92c0d26ef8ea4cb7a464b3 SHA-256: 77d9eee3bce845e2381c7e19f84280433d244f0b6bbc4aca7b6e7d61c1d0eafc
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated and point to other PDF files, indicating a link farm or SEO spam tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the PDF structure itself is used to facilitate the malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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
  • 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://zajinet.ru/award?keyword=pdf+bestand+comprimeren+mac
    • https://cdn.sqhk.co/bujasugawo/b5bIJOy/us_armed_forces_enlisted_rank_insignia.pdf
    • https://cdn.sqhk.co/kasuvapexal/qChgjjj/medetawalofufetagojokigu.pdf
    • http://kovuzaxaf.medianewsonline.com/red_rising_series_characters.pdf
    • https://cdn-cms.f-static.net/uploads/4393346/normal_603a73e61a002.pdf
    • https://cdn-cms.f-static.net/uploads/4454048/normal_6039cb85b7a1b.pdf
    • https://cdn-cms.f-static.net/uploads/4476268/normal_60243a946d140.pdf
    • https://cdn-cms.f-static.net/uploads/4424683/normal_605550397abce.pdf
    • http://fevinoreniwelik.sportsontheweb.net/funivo.pdf
    • https://static.s123-cdn-static.com/uploads/4425483/normal_5fc71898b4af7.pdf
    • https://static.s123-cdn-static.com/uploads/4416490/normal_5fdf73b62a7be.pdf
    • https://cdn.sqhk.co/zuzemokobexo/jjVghi1/jiwoxepagasavikeveritotu.pdf
    • https://static.s123-cdn-static.com/uploads/4475864/normal_5fca2ee44b225.pdf
    • https://cdn-cms.f-static.net/uploads/4379856/normal_60445c074329f.pdf
    • http://tojuvapemupo.mywebcommunity.org/96130084120.pdf
    • https://cdn.sqhk.co/vonirosidejo/Njgwjj6/of_road_games.pdf
    • http://mezogevap.mypressonline.com/zaromebapogopos.pdf
    • https://cdn.sqhk.co/mitebosareki/cjeXK2H/bakogosikexixoj.pdf
    • https://cdn-cms.f-static.net/uploads/4408989/normal_602c3566558b4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://pusebirenox.myartsonline.com/40270636384.pdf
    • https://9de673a2-3b8e-40eb-bbf5-c0ad8e71a3da.filesusr.com/ugd/bd5c68_72b0b959f8e54b4383d1fbbc14d28864.pdf?index=true
    • https://a0758896-f8c2-4fc9-8c7e-5c1738e8bc18.filesusr.com/ugd/0ce882_4a64e34f212a4b69b8e7cc6f4cb7c9a8.pdf?index=true
    • https://1b2c4efd-c8eb-4b04-b26f-b9154d704720.filesusr.com/ugd/d3758e_f4548378946a49f28f794da1b8d825d9.pdf?index=true
    • https://9c789f27-b70c-4c9d-9e83-211ee8f99b38.filesusr.com/ugd/bdeb4c_87f138e3887c4188b0da58f06476fdfd.pdf?index=true
    • https://42190e62-4dca-482d-a077-ae7b222d7779.filesusr.com/ugd/b91392_6bcd017912e34749a47ea448ee104010.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8fa.bin
e65fe29bbb0480d11ac9c4614ed1edb7bd77fc01e924562a5fd7020211059226		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FA 5196 bytes
font_01_sfnt_off00010a74.bin
22178591acbade4391ba0c1b8530781e7656cb3fa5d47231657cfa72f8347b4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A74 11132 bytes
font_02_sfnt_off00012ffe.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FFE 4324 bytes

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