Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b1faa065f922b61…

MALICIOUS

PDF

64.9 KB Created: 2020-12-05 14:32:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 910d7f7ab1b8376d3c82b8f6b6f9a1eb SHA-1: e4270a21c6e34f29e9da183810719360791c9be8 SHA-256: 4b1faa065f922b6117ad7b86622912bf1a8bbed9bf57baaf5a46fb8bdcf8a620
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical detection for a link farm and a high ML score. It contains numerous external links, many pointing to disposable hosting, suggesting an attempt to manipulate search engine results or redirect users to potentially harmful content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffking.ru/strik?utm_term=ac+blower+motor+replacement
    • https://fimupekegu.weebly.com/uploads/1/3/4/5/134502303/firoz-kunuboduzufap-nalisexo-wedone.pdf
    • https://fopojikanerev.weebly.com/uploads/1/3/4/8/134888820/bapujafo.pdf
    • https://sunajekivogemaz.weebly.com/uploads/1/3/4/8/134895881/laketipusaxiw.pdf
    • https://semovililuf.weebly.com/uploads/1/3/4/4/134476677/tujuxiteve.pdf
    • https://bijimeko.weebly.com/uploads/1/3/4/3/134327756/xuturopovawiki.pdf
    • https://fetevemukimagon.weebly.com/uploads/1/3/4/8/134896640/8679557.pdf
    • https://kukatuvitakutir.weebly.com/uploads/1/3/4/6/134690336/ruragores.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/desekusoxi/fibromyalgia_guidelines_australia.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf50021972c46e3c9563bb/1606373378512/73917545826.pdf
    • https://uploads.strikinglycdn.com/files/d87411aa-faf1-40c0-a85b-93b8a8d24dc4/badikuxokawivukon.pdf
    • https://static1.squarespace.com/static/5fc0bf1b9955c744b53ac36d/t/5fc117b41972c46e3cc514f0/1606490036986/nasidoruvupadeworabegumi.pdf
    • https://static1.squarespace.com/static/5fc286302e34347c704e786a/t/5fc712fb5060c93fcd75779d/1606882046914/44984460733.pdf
    • https://s3.amazonaws.com/fejatepudopito/lozapinoniwaroveg.pdf
    • https://s3.amazonaws.com/sixenogafopoj/fotexezetadefivoxiwubup.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_off0000c2e0.bin
6a42d555c6996643baba88260f464560cbaf60eaa03197438afdc3e7958c42de		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E0 5124 bytes
font_01_sfnt_off0000d443.bin
67ebeb7fce85adb6efaa0ceb95fb000460f87a6b49d9f23d2c13ad3590097f0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD443 10104 bytes

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