Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcae6a9a6e9f117b…

MALICIOUS

PDF

69.1 KB Created: 2021-03-31 23:00:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 81b308f685f7b2349800c88d10ac7f2c SHA-1: a3f19dd1b362ef6f23f9849b1f144ba86a7fd65f SHA-256: bcae6a9a6e9f117b894ab4d4cf85ba32376b28a6dd67fc8fd7442de9aaec402f
196 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a phishing or malicious content delivery mechanism, indicated by the 'PDF_SEO_LINK_FARM' heuristic and numerous external URLs. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of a password-protected archive lure implies an attempt to bypass security scanning by encrypting the actual payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://seumenha.ru/wix?keyword=synapse+x+reddit
    • https://cdn-cms.f-static.net/uploads/4374986/normal_604ee5a630172.pdf
    • http://fesotisifofil.mygamesonline.org/employment_news.pdf
    • https://cdn-cms.f-static.net/uploads/4407064/normal_605fbd2ae5775.pdf
    • http://felidefewipikig.22web.org/alveolitis_seca.pdf
    • http://newoxoxi.mywebcommunity.org/75181414621.pdf
    • http://pinopizo.sportsontheweb.net/doturanubitilitanuzo.pdf
    • http://vubitim.sportsontheweb.net/how_much_can_a_pallet_jack_lift.pdf
    • http://fikakutipid.mygamesonline.org/ridunubikewewupokulomefim.pdf
    • https://cdn-cms.f-static.net/uploads/4374533/normal_6024c38010b60.pdf
    • https://cdn-cms.f-static.net/uploads/4371498/normal_603aa48976f5e.pdf
    • https://static.s123-cdn-static.com/uploads/4420767/normal_5ff1d8aa70c5a.pdf
    • https://cdn-cms.f-static.net/uploads/4450340/normal_60160f5999432.pdf
    • https://cdn-cms.f-static.net/uploads/4426558/normal_6033425f05b89.pdf
    • http://sopidemeleket.mygamesonline.org/89690536103.pdf
    • https://cdn-cms.f-static.net/uploads/4385634/normal_5fdb006b51a7a.pdf
    • https://cdn-cms.f-static.net/uploads/4478378/normal_601a18f899cbc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b4140449-9b96-4148-8619-c9b3eed7b48c.filesusr.com/ugd/c33cdb_331273dd15c547f8b5d64c8dfd4c85d9.pdf?index=true
    • https://f6e2a16f-d004-42cd-8f17-0463e090774c.filesusr.com/ugd/c70c35_de1abd00dccf4ee082a9c0239839d0c7.pdf?index=true
    • http://diruben.rf.gd/kijuvugikovasuxunajusaj.pdf
    • http://sofibimibojas.myartsonline.com/rixixusipoxevukov.pdf
    • https://b3dfd9c9-1030-471f-a26d-814ea73dbccc.filesusr.com/ugd/d97afa_8a3e6fa273994c56a7c6b03e8cef6e0d.pdf?index=true
    • http://zevesijuduma.atwebpages.com/delirium_trilogy_book_4.pdf
    • http://sudexixurijaxoz.atwebpages.com/administrao_publica_estrategia.pdf
    • http://waraposid.rf.gd/79314032392.pdf
    • https://65f7c47b-6fa2-4aed-9649-637438a88329.filesusr.com/ugd/8fb471_49641fc5b87847fca85b0daf55430733.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf21.bin
561fb0c28030113a70bff1943b1c5a9f2efdc733695d182658b1837b8dc9f497		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF21 5192 bytes
font_01_sfnt_off0000e0e9.bin
958c03b1e024904789ce9d82c002c425e1c38599476bf4ad3794d0035cedbce7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E9 12004 bytes

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