Malicious PDF — malware analysis report

Static analysis result for SHA-256 d73aa6e314b279b3…

MALICIOUS

PDF

76.5 KB Created: 2021-05-19 23:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b70b62ca5ae0bd36d2a57bd34ba528b SHA-1: c2ea64bac10681e4b128a512562179649fe31483 SHA-256: d73aa6e314b279b32f04867d00c9a7948515b69867723a2d802002f9ae09539c
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO poisoning attempt. One prominent URL, 'https://druttle.ru/strik?utm_term=helter+skelter+book+cover', is directly embedded and likely serves as a lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://druttle.ru/strik?utm_term=helter+skelter+book+cover
    • https://cdn-cms.f-static.net/uploads/4476782/normal_601b97c9dba09.pdf
    • https://xiwupegolowiba.weebly.com/uploads/1/3/1/6/131606046/buvupoke.pdf
    • https://static.s123-cdn-static.com/uploads/4474170/normal_5fe2af4f8b1b8.pdf
    • https://videxopejevis.weebly.com/uploads/1/3/5/3/135333638/178fad77ab0405e.pdf
    • https://japilosibif.weebly.com/uploads/1/3/4/5/134578465/35fb8923fdd.pdf
    • https://static.s123-cdn-static.com/uploads/4428043/normal_5fec5b8f046e2.pdf
    • https://cdn-cms.f-static.net/uploads/4482671/normal_602384390bb98.pdf
    • https://mutuvedaluvop.weebly.com/uploads/1/3/1/8/131856278/ropexomip_gunabelaxukum_nugudememijupu.pdf
    • https://cdn-cms.f-static.net/uploads/4417049/normal_6047a9c7ba68d.pdf
    • https://cdn-cms.f-static.net/uploads/4410414/normal_60523d302dacc.pdf
    • https://cdn-cms.f-static.net/uploads/4365540/normal_600e48b05fbc7.pdf
    • https://cdn-cms.f-static.net/uploads/4471958/normal_6017ce62e7c7f.pdf
    • https://static.s123-cdn-static.com/uploads/4413705/normal_600574f93dda7.pdf
    • https://static.s123-cdn-static.com/uploads/4414679/normal_5feceddc24c83.pdf
    • https://zufezegudowoz.weebly.com/uploads/1/3/2/6/132683286/libazu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lizuseguwix/nobabaxenazidugov.pdf
    • https://s3.amazonaws.com/pululusodogi/2000_jeep_grand_cherokee_laredo_user_manual.pdf
    • https://s3.amazonaws.com/jukoxisojow/wevipujamovetubulesa.pdf
    • https://s3.amazonaws.com/zisulamisozoto/98865931157.pdf
    • https://s3.amazonaws.com/navoburarovada/kijapoxoporogirokugupazin.pdf
    • https://s3.amazonaws.com/lizuseguwix/exploiter_orb_guide.pdf
    • https://s3.amazonaws.com/xumakomowi/setimabodoke.pdf
    • https://s3.amazonaws.com/somamere/meradis.pdf
    • https://s3.amazonaws.com/nefomojuwet/numbers_expense_report_template_free.pdf
    • https://s3.amazonaws.com/rafiralexezol/school_uniform_essay_topic.pdf
    • https://s3.amazonaws.com/jonora/85919287232.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_off0000ecf7.bin
5a6db1cc1d0a9586b64ae7818673b566b6879207f519896debb1861eba3c544c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECF7 4808 bytes
font_01_sfnt_off0000fd65.bin
1c157f14b04ca545f63f2d2864abaa4316cee9ce5ebab6fcf78c1ded78e6a44f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD65 11664 bytes

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