Malicious PDF — malware analysis report

Static analysis result for SHA-256 b37709ff80b9f034…

MALICIOUS

PDF

80.4 KB Created: 2021-03-29 10:21:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 700a41dc11120ec86cf4f6de651a0b1e SHA-1: 79c281a1a0653e16d3b7e86d82ca111b3fe23b1c SHA-256: b37709ff80b9f034684b9901bd005a1eddf7c0ed02a0cfd3e2ece4addeed39e1
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are generated SEO-style links, suggesting a link farm or phishing attempt. One prominent URL, 'https://soxebez.ru/strik?utm_term=who+were+cain+and+abel%2527s+parents+in+the+bible', is directly embedded and likely leads to a malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soxebez.ru/strik?utm_term=who+were+cain+and+abel%2527s+parents+in+the+bible
    • https://cdn-cms.f-static.net/uploads/4370529/normal_6051ffd7c6d2a.pdf
    • https://cdn-cms.f-static.net/uploads/4406775/normal_6057bafca7beb.pdf
    • https://cdn.sqhk.co/rufebumu/2pghwQd/simple_reversible_reactions.pdf
    • https://static.s123-cdn-static.com/uploads/4374957/normal_5ff9085351d9f.pdf
    • https://cdn-cms.f-static.net/uploads/4467601/normal_601d638d5dfd8.pdf
    • https://cdn.sqhk.co/vuwipabobatu/icOjljJ/moxokopa.pdf
    • https://static.s123-cdn-static.com/uploads/4375361/normal_6008cd1ab25ec.pdf
    • https://static.s123-cdn-static.com/uploads/4382192/normal_600102af20825.pdf
    • https://cdn-cms.f-static.net/uploads/4465564/normal_5fe808ec49a36.pdf
    • https://cdn.sqhk.co/lazujanaziri/jb49byB/wilmington_ohio_tractor_pull_2020.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://ac3db616-04cb-40f1-8357-c67041f5e20c.filesusr.com/ugd/eda9ba_a010f432c2304e39b27954b4750a32f6.pdf?index=true
    • https://e590c0d9-b694-44fb-9862-47327b30d8b0.filesusr.com/ugd/89363e_2f6255f06c074bbc9d760f5721a69657.pdf?index=true
    • https://6200e599-3f2f-4e3e-ab45-e6977ed7e777.filesusr.com/ugd/f8de3e_9f44e3a3d77546ce96b55c13f62b93d4.pdf?index=true
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_6299090a9d2144e1bde8fa868db74ab0.pdf?index=true
    • https://6e37e838-c278-4d46-baa9-25b8497af200.filesusr.com/ugd/fbcb80_d0c0709a7aad48bd94ca24cf358fb0bb.pdf?index=true
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_55d2e95308d141f68ff1de15d901f121.pdf?index=true
    • https://0df6220b-9630-4647-aab6-0d9db69b9d59.filesusr.com/ugd/8b97dd_a48367aa31b44f01837000b22f3d586e.pdf?index=true
    • https://18e99e0c-7034-4a8c-9069-267580a295b8.filesusr.com/ugd/b337f5_124e59f67161447ea07212115627e0cb.pdf?index=true
    • https://a819be37-316e-4347-83bc-b067fb6953c8.filesusr.com/ugd/d5662a_34b9bfddfd8e49f68b07110b932a8371.pdf?index=true
    • https://1f2f8e77-98df-4c5e-b88a-83bc2b612b58.filesusr.com/ugd/5c7528_302919e24ad44a609c9205e76fcfe3d1.pdf?index=true
    • https://85d2c5a2-fc31-4f76-86b4-4ebe2abe2bf4.filesusr.com/ugd/a8cc01_44d053eb2f75433db2d03f70b0945017.pdf?index=true
    • https://19aaccd0-9772-41b6-85c4-be118606641a.filesusr.com/ugd/a12125_617e0a29470b4277b213bf2d882c0072.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eea9.bin
86cd04aa1cdc04d57186c5e400195caa3874522b84b803d63a6b4e4b010ed2e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA9 5228 bytes
font_01_sfnt_off00010074.bin
7eaeca0b0fb651e20880b8fec81a20c9cb9705c723f7269d21c2240013172476		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10074 11016 bytes
font_02_sfnt_off000125fc.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125FC 4324 bytes

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