Malicious PDF — malware analysis report

Static analysis result for SHA-256 919c93b78bd029c9…

MALICIOUS

PDF

75.2 KB Created: 2021-03-25 07:41:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 919d4cbd637f254f2f229ced11ec3687 SHA-1: b84b1a2406b1ca6413138bdd10872b2cfa425ab0 SHA-256: 919c93b78bd029c9ecde526ecdb7ebff2cb952d2bd7c70f9f32d96110d8c2158
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to appear as legitimate search results. The primary malicious URL identified is vilenefex.ru, which is likely used to host phishing content or distribute further malware. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/award?keyword=late+adulthood+social+development+pdf
    • https://xoxigukot.weebly.com/uploads/1/3/4/8/134861038/tapix.pdf
    • https://mosugomepa.weebly.com/uploads/1/3/4/0/134096926/1794071.pdf
    • https://zedimidobigeno.weebly.com/uploads/1/3/4/7/134721933/lisinuri.pdf
    • https://cdn-cms.f-static.net/uploads/4425515/normal_6051ed42a2aa6.pdf
    • https://cdn-cms.f-static.net/uploads/4369774/normal_5fe9b5bcb967c.pdf
    • https://sowodelomix.weebly.com/uploads/1/3/5/3/135315299/retalavalel_kuzoru.pdf
    • https://static.s123-cdn-static.com/uploads/4496165/normal_60089dcdcbbc9.pdf
    • https://cdn-cms.f-static.net/uploads/4474220/normal_603324b9b68a8.pdf
    • https://vulesavub.weebly.com/uploads/1/3/6/0/136095957/79a428c.pdf
    • https://sodomolu.weebly.com/uploads/1/3/5/3/135398587/toniriwolixebib.pdf
    • https://bolowotusupiwam.weebly.com/uploads/1/3/5/3/135300352/lajivizutagosuresip.pdf
    • https://cdn-cms.f-static.net/uploads/4369632/normal_5fd384ba656f0.pdf
    • https://cdn-cms.f-static.net/uploads/4451352/normal_60470d29c827d.pdf
    • https://cdn-cms.f-static.net/uploads/4416919/normal_601de879741c6.pdf
    • https://kadefevexenikoz.weebly.com/uploads/1/3/0/8/130813118/a9cd5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://78ff948a-0765-49f5-a22c-0fbe0eba7848.filesusr.com/ugd/888d0b_b0b92593361b4ca3b0defabefce3e002.pdf?index=true
    • https://43cb2d18-1589-43a7-b1c5-fe1278e1c76d.filesusr.com/ugd/370b54_168fe67d3cf9413d97a1d2192a109c4c.pdf?index=true
    • https://5071cc05-3fa2-46b1-b944-d2523ca4b51d.filesusr.com/ugd/62e2c1_97785e45e4f547d49575a190ee1f17c8.pdf?index=true
    • https://36fde204-cda4-4268-899b-58717f9005d0.filesusr.com/ugd/b13063_58d9658f64af4796b9a7314e37550c06.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_off0000e7d2.bin
e0b1118c9871d25009e371b356b09820c93f422c7d29daa624f9219f26c12d63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D2 5300 bytes
font_01_sfnt_off0000f9ca.bin
e481632070525fa03b5454ae54c2fd541f79c8d852c94f622b4c92e9cdd3f30f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CA 10544 bytes

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