Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5ff4fd2dd5d2a80…

MALICIOUS

PDF

95.4 KB Created: 2021-04-03 05:23:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c40f875a40715b8a1116ad8dcc01fcc5 SHA-1: d504a8c9851efc0af379def2931eddd7c6f30674 SHA-256: a5ff4fd2dd5d2a8009985ff91714bbc05988f7c1374a790c74c716bd002fcd17
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs pointing to other PDF files, some hosted on disposable domains. The primary purpose appears to be directing users to potentially malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/wix?keyword=history+2+crossing+the+line
    • https://vejarava.weebly.com/uploads/1/3/1/0/131070596/vebixujak_tupejak.pdf
    • https://cdn-cms.f-static.net/uploads/4420934/normal_601b292b93eb6.pdf
    • http://trynon.xyz/33609715925xtaft.pdf
    • https://fogolimavoburaj.weebly.com/uploads/1/3/0/8/130813413/a21f09b51cc5.pdf
    • http://rixorevu.getenjoyment.net/wivitofegajuxej.pdf
    • https://gilepinewuje.weebly.com/uploads/1/3/4/0/134096317/xofemevoreb-poxozeloguv-jamakerotixub-zaramu.pdf
    • http://medway24.com/36204645595s1sek.pdf
    • https://jamiwimavebu.weebly.com/uploads/1/3/1/4/131453695/02f52b0becda.pdf
    • https://levalezekavazif.weebly.com/uploads/1/3/4/6/134639406/netupivusisu.pdf
    • https://cdn-cms.f-static.net/uploads/4393489/normal_604db02529e9c.pdf
    • https://cdn-cms.f-static.net/uploads/4414848/normal_605d1a9b7efa4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://28f2c00a-638b-45ec-8848-4d649cb6aba9.filesusr.com/ugd/946f28_0298ed10cea1440bb45c4e06c8884bfd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/aa492574-f6a7-415a-8336-61c0961a847f/gitutunuripa.pdf
    • https://6b137298-3864-41c5-aaa3-11744000c3c2.filesusr.com/ugd/b916f4_9d5a5d6459da44eb94ec715586c0c316.pdf?index=true
    • https://3b87a2b8-2d13-4e6d-acc4-cbba57692a59.filesusr.com/ugd/50988c_f5824126923c48c38d883278a3a4e126.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c54a1524-7a58-49f8-91d0-0dfbc1a21877/gevifafepulisufuritene.pdf
    • http://wuragumok.atwebpages.com/how_to_support_diverse_learners.pdf
    • https://f8d4b294-f952-4a11-85e8-0a3036f9bdaf.filesusr.com/ugd/ad8f3a_452b54c051e74a2090f7f5ca8cc47cc5.pdf?index=true
    • https://3bcdeb60-9876-4d14-bc0a-1dd1632c647c.filesusr.com/ugd/16a96a_cf5e80ba975d44d5a33e3de24f467243.pdf?index=true
    • https://uploads.strikinglycdn.com/files/11f8ecc9-d752-4327-aabe-c237b868d193/sojumag.pdf
    • 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_off00011a78.bin
4c68287e5c6fff2172618275a1193519ba37c5d76fff6d2208063ed5433202ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A78 9344 bytes
font_01_sfnt_off00013976.bin
9dd620cc69fd152681af3d7be4eb39ab65b6a1e0467fca2a8f37ade85aa3466d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13976 5048 bytes
font_02_sfnt_off00014aaa.bin
dad9bade4f1323c60e1cd3faa6a15f83705e3b4245a5be6d362caa88746231d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14AAA 11100 bytes

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