Malicious PDF — malware analysis report

Static analysis result for SHA-256 c82c327adf77a6a0…

MALICIOUS

PDF

79.7 KB Created: 2021-03-18 14:37:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: c2a97c2b9a0b43fb3f46357001fa2827 SHA-1: e9515a4256689424605506fa48a7d0761b7901db SHA-256: c82c327adf77a6a0e357ecc3febc3c7264acf50af7031e46447e9da8f014ba1a
134 Risk Score

Malware Insights

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

The PDF document contains heuristics indicating it is a link farm and a potential invoice/payment lure. It embeds multiple URLs, with one specifically pointing to a page about military reserve retirement pay, suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://bologen.ru/strik?utm_term=how+to+apply+for+military+reserve+retirement+pay PDF link annotation
    • https://cdn.sqhk.co/jobasalem/gzhbjcV/amazement_square_jobs.pdfIn PDF document text
    • https://pumaxodevuk.weebly.com/uploads/1/3/1/8/131872084/4008701.pdfIn PDF document text
    • https://cdn.sqhk.co/pinofizulag/jdnhiVh/87839405720.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484383/normal_605154640bd8e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421960/normal_5ffdaf62bf4d4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410204/normal_5feda5d309f8b.pdfIn PDF document text
    • http://wordsidepost.top/oster_bread_machine_recipes_5838xhfol.pdfIn PDF document text
    • https://cdn.sqhk.co/fegukajebaj/fKyibgF/56300796824.pdfIn PDF document text
    • http://bufo.online/turore915cu.pdfIn PDF document text
    • https://riwaxetonebena.weebly.com/uploads/1/3/4/3/134363930/muzolawamagox.pdfIn PDF document text
    • https://cdn.sqhk.co/jifedibodo/kpgeji8/bad_piggies_mod_leading_edge.pdfIn PDF document text
    • http://kmplitka.shop/can_you_put_crystals_in_candlesa5sgm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383156/normal_60384a9982e7e.pdfIn PDF document text
    • https://bonujuvab.weebly.com/uploads/1/3/2/7/132740321/jotew.pdfIn PDF document text
    • https://cdn.sqhk.co/fowoleleda/ylibEhh/97372524904.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dozore/11039083113.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/lixefisupibuxife.pdfIn PDF document text
    • https://89e1056b-8c01-44a4-bea5-a80a497d444f.filesusr.com/ugd/6db6f7_ab82c9cb9155441ca432882458e520ae.pdf?index=trueIn PDF document text
    • https://f18b8dc1-3ce9-44bd-8712-01435d039869.filesusr.com/ugd/b97cba_d59cccd380ee49a785b88dc10b8bda30.pdf?index=trueIn PDF document text
    • https://76bf09fe-c378-4d6f-baa9-beaf48595a8b.filesusr.com/ugd/61567a_5936deeb85944488a3a42ed2544206c0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/resisuna/naming_aromatic_compounds_exercises_with_answers.pdfIn PDF document text
    • https://77483064-5892-4b52-b419-66e751946b77.filesusr.com/ugd/ef7b09_91a394b00f8040f6ac9bff58646b27c2.pdf?index=trueIn PDF document text
    • https://6d706a39-1f93-4f1a-9423-caccf7e65e71.filesusr.com/ugd/69f91f_46e37c924c4d4c13a5759a0f88950cbd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/benuka/25151254894.pdfIn PDF document text
    • https://s3.amazonaws.com/dewazewokib/lalobasoxidajafo.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_off0000fa07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA07 5264 bytes
SHA-256: 35c33b394de990a81bde3a57e7847b87a9997df7ea30cc249b5d19a1550d2de3
font_01_sfnt_off00010bf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF8 10852 bytes
SHA-256: aea5c7c8962b06045cdb31a4a206527f10e9835127b6d3dd10f4969b92ed3c4f

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