Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a8082debd23dcd2…

MALICIOUS

PDF

76.2 KB Created: 2021-03-10 22:56:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: afd3d28ddf56b4472a49aa918af04499 SHA-1: 99dffeb04eeac39a66054ae07aba9d064763c3e3 SHA-256: 0a8082debd23dcd26d1db46ebb94d9b5417d103b175cf8eec7141d8a522f576c
186 Risk Score

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 0.9998

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://xezojetit.ru/award?keyword=flamenco+guitar+method+for+beginners+pdf PDF link annotation
    • https://kozamenarolu.weebly.com/uploads/1/3/2/6/132682647/cc011ce1.pdfIn PDF document text
    • https://tizomunu.weebly.com/uploads/1/3/6/0/136050200/eb7950cc5e481.pdfIn PDF document text
    • http://lozejebivo.scienceontheweb.net/vapewususotebiginisuk.pdfIn PDF document text
    • http://pusapev.scienceontheweb.net/seniroxanugipezafefugo.pdfIn PDF document text
    • https://felabare.weebly.com/uploads/1/3/0/7/130776415/1222cddbf.pdfIn PDF document text
    • https://wetusaseri.weebly.com/uploads/1/3/5/2/135297966/e6caa73.pdfIn PDF document text
    • https://tolejavufagus.weebly.com/uploads/1/3/1/4/131437822/5195c7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6997f972-013f-4c6f-ac95-4179ba17a557.filesusr.com/ugd/549e1a_92f703a3111246cfa378ff78076e698b.pdf?index=trueIn PDF document text
    • http://xajokaxakubif.rf.gd/acadian_asset_management_performance.pdfIn PDF document text
    • http://bezofiwod.rf.gd/nutrition_taco_bell_breakfast_quesadilla.pdfIn PDF document text
    • https://9387bd13-3746-4408-b474-2867f26e464d.filesusr.com/ugd/ace02d_1b4e33719507478dbba40ca33c9534d8.pdf?index=trueIn PDF document text
    • http://nenadizalotoj.epizy.com/johnny_the_homicidal_maniac_directors_cut.pdfIn PDF document text
    • http://jasigobup.epizy.com/bentayga_w12_performance.pdfIn PDF document text
    • https://a694a867-b0fa-45cd-b082-7f9abf80b1a7.filesusr.com/ugd/430cb2_300187e6c4eb4c46a37e2d0212d3c4b7.pdf?index=trueIn PDF document text
    • https://2cc12256-1025-444a-bacb-901a9f007bda.filesusr.com/ugd/d1fcfc_36ea9a22e99c484998d2dafdcee19fa6.pdf?index=trueIn PDF document text
    • http://wubezirinipo.epizy.com/letunomor.pdfIn PDF document text
    • https://55963656-6eb1-4b25-bcd5-bb835d65808b.filesusr.com/ugd/0064ae_192dd91523ae4efab1698329314f0b8f.pdf?index=trueIn PDF document text
    • https://f1cb2ec4-a82d-4768-8a06-5236a2db220e.filesusr.com/ugd/a2e20a_ab69d1859eed420d9173a90971ba1ad9.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_off0000ecb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB7 5664 bytes
SHA-256: b9ce95bdee6145b9cf19d808726d857f877d82f6fc9a6b45740f73af8d09abf9
font_01_sfnt_off0000ffce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCE 10404 bytes
SHA-256: bc8e577c32cf776a20a9a39b485b334f7facc8933be94e4a66a17102ac8667d3

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