Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff710cefe31a8c72…

MALICIOUS

PDF

79.6 KB Created: 2021-05-13 08:42:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 3e7d1ad804c35a1861f25f0a492195ce SHA-1: 239cd3d2b2578db2c8c3309d19b64e2a5f883d05 SHA-256: ff710cefe31a8c722a2c2cb121815bee487bd3cbfea40413f0da3aa2f32e9585
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a primary suspicious URL identified as 'https://baarspo.ru/strik?utm_term=navy+eval+statement+page+limit'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://baarspo.ru/strik?utm_term=navy+eval+statement+page+limit PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4499334/normal_5fdb227de3e9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391305/normal_603108dbbf18c.pdfIn PDF document text
    • https://cdn.sqhk.co/vidujubotaf/fu96SQ6/vekuzurasef.pdfIn PDF document text
    • http://xodaxedepapopox.mygamesonline.org/galomifilosix.pdfIn PDF document text
    • http://salimom.mygamesonline.org/69494098217.pdfIn PDF document text
    • http://jelojutu.sportsontheweb.net/aspen_plus_guide.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413703/normal_5fef3fad2c35a.pdfIn PDF document text
    • http://firobazotu.sportsontheweb.net/inverse_of_a_matrix_by_adjoint_method.pdfIn PDF document text
    • http://instacopyrighthelpteam.com/the_decision_book_reviewnkekr.pdfIn PDF document text
    • http://nanolenka.xyz/cuantos_milimetros_tiene_un_metroyasfq.pdfIn PDF document text
    • http://tiriruno.sportsontheweb.net/4420945588.pdfIn PDF document text
    • http://dodajavux.scienceontheweb.net/dnd_5e_paladin_oath_of_vengeance_gods.pdfIn PDF document text
    • https://cdn.sqhk.co/nufanusiki/nhjiaih/negin_mirsalehi_boyfriend.pdfIn PDF document text
    • https://cdn.sqhk.co/mujowofapubi/lPigP0l/nintendo_classic_mini_gameboy_spiele.pdfIn PDF document text
    • http://biomanua.website/495688638237cp44.pdfIn PDF document text
    • http://minesaxofunawi.getenjoyment.net/wilumo.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/igjogi7/nixotaxap.pdfIn PDF document text
    • http://lazisirogabidir.mypressonline.com/subject_verb_agreement_worksheets_grade_1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lipabarud.atwebpages.com/gapokaxivebitufepomavawub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69c51ed3-4df4-4805-9951-0b7cf506568b/26004108250.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b85c3072-e7a1-4a69-9ed0-c4077d6a99bd/54780300477.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5d15630-371b-4119-9bf4-9f0b52aa97a2/24542777061.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_off0000f99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99A 5176 bytes
SHA-256: 840c6e1a17fddfd6522ef7fbcc0f8135d7b8a27b34f903eb3fc00512f91702ea
font_01_sfnt_off00010b3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3D 11220 bytes
SHA-256: 76f24608df1bb9332e13f12fd54b6c911e2f80673851775df0ab1d44d053d752

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