Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c35a8f142578ba1…

MALICIOUS

PDF

89.0 KB Created: 2021-06-03 04:07:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4ec5a5d26bfd0541db0842b20f7fd61a SHA-1: db3919a127221f2d39515f50142b94902114ce4d SHA-256: 6c35a8f142578ba176523e7176a22fa4d61e0131b58d6ad2d2bf9dc10580a2ba
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on different platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware through these linked documents. No scripts were extracted, but the structure suggests an attempt to manipulate search engine results or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://philabc.ru/pbw?utm_term=personal+narrative+paragraph+examples+pdf
    • https://vefutafefu.weebly.com/uploads/1/3/4/8/134882527/8caa0c6.pdf
    • https://static.s123-cdn-static.com/uploads/4462678/normal_5fde12f688d4f.pdf
    • https://cdn-cms.f-static.net/uploads/4443815/normal_601e46992013c.pdf
    • https://static.s123-cdn-static.com/uploads/4412408/normal_5fe268923bfe3.pdf
    • https://tipujinozubuva.weebly.com/uploads/1/3/4/8/134883375/vibebarafilerolo.pdf
    • https://static.s123-cdn-static.com/uploads/4409623/normal_5fddd9e51688f.pdf
    • https://cdn-cms.f-static.net/uploads/4366319/normal_6043272dca46a.pdf
    • https://static.s123-cdn-static.com/uploads/4402724/normal_5fcf25c7b4fef.pdf
    • https://cdn-cms.f-static.net/uploads/4417029/normal_601ee7904ecb2.pdf
    • https://cdn-cms.f-static.net/uploads/4418777/normal_60194826e7f0f.pdf
    • https://cdn-cms.f-static.net/uploads/4503387/normal_606127db826e3.pdf
    • https://toxavikosas.weebly.com/uploads/1/3/4/4/134437834/ce7ab4425c2d.pdf
    • https://povarudoro.weebly.com/uploads/1/3/5/3/135324530/3693975.pdf
    • https://static.s123-cdn-static.com/uploads/4369504/normal_6003f72b7e19c.pdf
    • https://tedunifadikave.weebly.com/uploads/1/3/7/5/137505165/badikelojas.pdf
    • https://static.s123-cdn-static.com/uploads/4422620/normal_5feb1872dfc90.pdf
    • https://cdn-cms.f-static.net/uploads/4476135/normal_602af431ced9e.pdf
    • https://static.s123-cdn-static.com/uploads/4388048/normal_5fde2d315cec6.pdf
    • https://cdn-cms.f-static.net/uploads/4457572/normal_60201a5ed1806.pdf
    • https://static.s123-cdn-static-d.com/uploads/4417669/normal_60b0616c8cbdd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/4968fb61-ee3c-4d4d-8b7b-6253961a7666/roxulamebujoxono.pdf
    • https://uploads.strikinglycdn.com/files/97c42500-be87-401d-93a3-b1c6e392c9ad/labesu.pdf
    • https://uploads.strikinglycdn.com/files/17b3eec2-7e18-4eb9-951b-8649a3ed6a0c/xerox_workcentre_7855_fuser_part_number.pdf
    • https://uploads.strikinglycdn.com/files/290e9699-c23d-4bc4-91a1-f11386c0d42b/61447663392.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_off000111c4.bin
a076d5d6931f1f7c82cb4ed7274e7c74141dc6bb0bfa5b98981ac944e60e9622		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111C4 5372 bytes
font_01_sfnt_off000123df.bin
56fcb20951772372507c0c2c0a7153d07b2f875f59ae79cbf736cbb7af058f84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123DF 10584 bytes
font_02_sfnt_off0001480f.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1480F 4324 bytes

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