Malicious PDF — malware analysis report

Static analysis result for SHA-256 d645ed2f7d59770d…

MALICIOUS

PDF

97.5 KB Created: 2021-02-16 05:40:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: aa637a1026b4236e8d3b59a9f90f4248 SHA-1: 22325b8d25b55a7ad755c42a1bff3218a3053d88 SHA-256: d645ed2f7d59770d2f9892d7e67938fb671409866b3bb402d361c38b74d723f7
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, containing a large number of external links pointing to potentially malicious or SEO-manipulated websites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the embedded URLs suggest the document's purpose is to redirect users to external sites, likely for phishing or malware distribution.

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://seumenha.ru/123?utm_term=garrett+hardin+tragedy+of+the+commons+solutions PDF link annotation
    • https://jatufajikovuna.weebly.com/uploads/1/3/4/7/134719937/2956942.pdfIn PDF document text
    • https://cdn.sqhk.co/lerapuraroke/jficjiN/csr_racing_classic_download.pdfIn PDF document text
    • https://ligiponofejejo.weebly.com/uploads/1/3/4/3/134346234/afc82182.pdfIn PDF document text
    • https://cdn.sqhk.co/nebinefis/yGpghdz/59699605467.pdfIn PDF document text
    • https://cdn.sqhk.co/soxobiwefili/Sgmsxgf/vector_full_auto_uzi.pdfIn PDF document text
    • https://kagepejipewabo.weebly.com/uploads/1/3/4/8/134871264/958e198aeece574.pdfIn PDF document text
    • http://raxijulerejo.iblogger.org/full_movie_free_online.pdfIn PDF document text
    • https://cdn.sqhk.co/gegefemorosu/pTBidjj/space_attack_galaxy_hope_galaxy_shooter.pdfIn PDF document text
    • https://cdn.sqhk.co/xawodoze/hhSibge/secret_of_mana_remake_weapon_orbs.pdfIn PDF document text
    • https://cdn.sqhk.co/somisafeg/hi3hnS1/79100821076.pdfIn PDF document text
    • https://cdn.sqhk.co/vedanoderifu/hahhjdr/when_do_license_plate_stickers_expire_illinois.pdfIn PDF document text
    • https://nonexivibofopuv.weebly.com/uploads/1/3/4/6/134603010/2369533.pdfIn PDF document text
    • http://daddytestit.xyz/deal_genie_real_estateovbuy.pdfIn PDF document text
    • https://bemebedutor.weebly.com/uploads/1/3/4/6/134624352/xixalumif.pdfIn PDF document text
    • https://junimadegerozo.weebly.com/uploads/1/3/4/0/134096607/1612c5133.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xelidamos.epizy.com/2018_hindu_calendar_with_holidays.pdfIn 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_off000141fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141FB 5568 bytes
SHA-256: 74c2910f5607f4f9f68057e3c2c04d024ffb36feabd2f494358d1e6d402cefba
font_01_sfnt_off000154d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154D0 10568 bytes
SHA-256: 4c869b00977b336423fe76da075e7ec859e17ec28e56573a1e17daef5c683c0e

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