Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6e92ef15b65ae2d…

MALICIOUS

PDF

79.8 KB Created: 2021-04-18 07:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 513276a19cf112f89ce35b1d6174aab4 SHA-1: b2730d438d6919d96769f6155c1e2ccae929763c SHA-256: f6e92ef15b65ae2df2c4bb14e9fb3482bbe22f8758d740144ff71571fb5d2a0f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are disguised as academic or informational content, suggesting a link farm or phishing attempt. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of generated links, and the ClamAV detection as 'Pdf.Phishing.Trojan' confirms its malicious nature. The embedded URLs likely lead to further malicious content or phishing sites.

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/strik?utm_term=california+life+science+7th+grade+textbook+answers
    • https://cdn.sqhk.co/letopoto/aQhaihF/dragon_quest_11_casino_roulette.pdf
    • http://katipef.medianewsonline.com/64141375703.pdf
    • https://cdn-cms.f-static.net/uploads/4383452/normal_603a203aba5f3.pdf
    • https://cdn.sqhk.co/nuxoporerom/hg1jg7x/hockey_clothing_brands_canada.pdf
    • https://cdn.sqhk.co/dazibewibu/ghigeKW/minecraft_new_ores_mod.pdf
    • https://cdn.sqhk.co/wezupobuwab/dgjjeic/govisug.pdf
    • https://cdn-cms.f-static.net/uploads/4468828/normal_6038e9a5bfca2.pdf
    • https://static.s123-cdn-static.com/uploads/4487424/normal_600650c6d3c2f.pdf
    • http://cardio-active.site/tiximowefogalagozb6oe.pdf
    • https://cdn.sqhk.co/zupivikeg/djaiyIv/tititapifa.pdf
    • https://static.s123-cdn-static.com/uploads/4409246/normal_5fe01ddfce645.pdf
    • http://natur-bio.space/41598353633h7hpf.pdf
    • https://cdn-cms.f-static.net/uploads/4407724/normal_5fe8bc321b352.pdf
    • http://wivikaxebox.medianewsonline.com/32264306240.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://7d14b3fe-44ab-47f5-a5a4-fb5d7998febd.filesusr.com/ugd/ba499c_3f2f25df78a147cc85a717e327632ca5.pdf?index=true
    • https://6bc61794-ec17-45f1-96eb-8bed4cd57308.filesusr.com/ugd/217b8a_504d6025c36543e29320970b4e74f410.pdf?index=true
    • https://s3.amazonaws.com/gafedupeba/maytag_3000_series_dryer_disassembly.pdf
    • https://s3.amazonaws.com/mibiwivanetuj/rezajipev.pdf
    • https://s3.amazonaws.com/gumagabu/20046188904.pdf
    • https://s3.amazonaws.com/zusevamasor/watirizovibukatul.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7f2.bin
1d5baebd69cc2eaacb2d952b41c44b4f5ee99f0c67c0d397c0667a6a6b559c36		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F2 5632 bytes
font_01_sfnt_off00010b2e.bin
6ac8ce82bac4a1039ad64b68812e225a88c4e761cb5345d8af2ed82c14ba7c7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2E 11236 bytes

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