Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa87431c08fa4acd…

MALICIOUS

PDF

93.1 KB Created: 2021-04-05 03:42:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: a4086cfa3cc1a349234d9d7bb66509fc SHA-1: 39c71055bd9e3456ea928e5fe144609848324dec SHA-256: aa87431c08fa4acdf2ceeac4536a3a8085d0824809773657294c28fa94f95dbd
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, with a significant heuristic indicating it's a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically phishing. The presence of a URL pointing to 'xajibur.ru' with a 'strik' path further supports the malicious nature, likely serving as a redirector or landing page for a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://xajibur.ru/strik?utm_term=strangers+in+their+own+land+review PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4493597/normal_601ad5856c036.pdfIn PDF document text
    • http://akfb.online/forma_de_contagio_da_ancilostomosemuf8u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386337/normal_604f58fec6655.pdfIn PDF document text
    • https://cdn.sqhk.co/gegenosuzun/XQiglge/20606535402.pdfIn PDF document text
    • https://cdn.sqhk.co/nepelusir/fja2ihI/cruise_ship_stock_market.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385028/normal_603cc7f0d50e5.pdfIn PDF document text
    • http://fb-pageunderreview.com/55355871423409tx.pdfIn PDF document text
    • http://evromotors.net/bejameramubirobar75f6.pdfIn PDF document text
    • https://cdn.sqhk.co/rureroso/JgdrypJ/monster_hunter_stories_apk_mod_offline.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374840/normal_5fe44c356a997.pdfIn PDF document text
    • https://cdn.sqhk.co/tefozakozup/xhcEKy9/movistar_team_2019_imdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470696/normal_5fd63dbe4e30f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499299/normal_5fd8098ce7fac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492245/normal_5ffb59b5575be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378171/normal_60371255ec24c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377098/normal_6048fd8b510e4.pdfIn PDF document text
    • https://cdn.sqhk.co/dimumaneda/UpKs83m/bojif.pdfIn PDF document text
    • http://0fruit.space/dinosaurs_vs_aliens_filmavpva.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4526930/normal_5fe289e4af56c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/023b9318-bbb8-4c38-85b2-77296aec0cdb/annabel_lee_deeper_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/d_d_grave_cleric_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/journal_of_heterocyclic_chemistry_author_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/lunojol/36519194215.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e49cda6-a610-4648-a98e-6c9317bc6eb1/us_navy_ranks_and_insignia_enlisted.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_off00012eab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EAB 5340 bytes
SHA-256: 84c44c318ce1ff2dc69d803e981b62259a7ee6aa1a0d26ff778df99c66101473
font_01_sfnt_off000140e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140E4 10704 bytes
SHA-256: 5229efbd44fe455a1c0e398ba54d2bfc636361539e0b7a3427d1acae062ce2a8

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