Malicious PDF — malware analysis report

Static analysis result for SHA-256 840a09d5004c3ca4…

MALICIOUS

PDF

88.8 KB Created: 2021-03-29 18:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a204ee62a611c3b52d9d1814dd0d291e SHA-1: 537ea7d5e2bd6f7a29a4c5ae3a5c5b539bd5cd23 SHA-256: 840a09d5004c3ca4c43b62ea20e918ddde7740ee6bc5a61771bf3620cc5fe2d8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9991

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://jacksth.ru/strik?utm_term=temas+biblicos+para+jovenes+cristianos+evangelicos+pdf PDF link annotation
    • https://cdn.sqhk.co/gegefemorosu/hiribje/snow_storm_superhero_mod_apk_latest_version.pdfIn PDF document text
    • https://cdn.sqhk.co/ridasozewe/GxharbR/project_snare_drum_for_sale.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374013/normal_5fe58d51484f9.pdfIn PDF document text
    • http://juzezudusota.mypressonline.com/fisorixirimani.pdfIn PDF document text
    • http://minesaxofunawi.getenjoyment.net/kiwejabo.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzowadijavu/jjjjfjc/42312121840.pdfIn PDF document text
    • http://kudusakepupa.sportsontheweb.net/alphabet_arabe_prononciation.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478946/normal_60104c72dd278.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386609/normal_602cea156c286.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424009/normal_60020118f1a6e.pdfIn PDF document text
    • https://cdn.sqhk.co/zejizoguzut/xhbT0ia/zukizidofumufaniwidika.pdfIn PDF document text
    • http://regsen.website/tactics_for_listening_tapescriptm3ohx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409798/normal_60306013af56f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491437/normal_5fc9bb4ca1936.pdfIn PDF document text
    • http://vadosaj.getenjoyment.net/67547488865.pdfIn PDF document text
    • http://vvd.bar/human_error_in_aviation_definitiond8n0x.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365547/normal_5fe10d3e5dd1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418001/normal_603d205560a08.pdfIn PDF document text
    • http://fiwupejebibogu.sportsontheweb.net/oceans_chords_c.pdfIn PDF document text
    • https://cdn.sqhk.co/lirebirab/0ig8hf7/emergency_dental_omaha_medicaid.pdfIn PDF document text
    • http://legiontry.online/14267321524ito7s.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sekuwomexapa.myartsonline.com/baghouse_filter.pdfIn PDF document text
    • http://pavabiza.atwebpages.com/75430965885.pdfIn PDF document text
    • http://zegiwewezenaro.myartsonline.com/ruzalofimewinisudaxaxova.pdfIn PDF document text
    • http://nosigegu.onlinewebshop.net/41411505691.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_off0001177a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1177A 5700 bytes
SHA-256: aa407e3ecea97d5b7ece38d96a08b64b53370347f4d780b62343dde339c6040b
font_01_sfnt_off00012acc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACC 12592 bytes
SHA-256: 83c24d29a1ea3fe0b3e61d7b9a7c7f4d353c8b9dd47b360a3e514873e9ae5b5e

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