Malicious PDF — malware analysis report

Static analysis result for SHA-256 10142ff336d7d47b…

MALICIOUS

PDF

76.9 KB Created: 2021-02-23 22:21:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 025ab4c1b337fb8e95ab275d2662abb9 SHA-1: 4627fe27d2f99517d7be9bc707e36ce8429a8a95 SHA-256: 10142ff336d7d47bd294c33076118573f5e349717ea3010fc0b84d9c0c588afd
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a large number of external links pointing to various PDF files hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, https://jacksth.ru/wb?keyword=hp%20elitedesk%20800%20g1%20sff%20ram%20specs, appears to be a search query, further supporting the SEO manipulation hypothesis. The document's structure and numerous external links indicate a potential distribution mechanism for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://jacksth.ru/wb?keyword=hp%20elitedesk%20800%20g1%20sff%20ram%20specs PDF link annotation
    • https://jexafowasefuxuv.weebly.com/uploads/1/3/4/5/134588667/biragagirobudiwadez.pdfIn PDF document text
    • https://widowajezow.weebly.com/uploads/1/3/4/5/134584852/5557485.pdfIn PDF document text
    • https://duwifugikez.weebly.com/uploads/1/3/5/3/135351140/dbb88567.pdfIn PDF document text
    • https://cdn.sqhk.co/gabadifofibo/wgc4jcg/nalozidarizejese.pdfIn PDF document text
    • https://fimiximokizo.weebly.com/uploads/1/3/1/3/131384127/3050838.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459917/normal_5fd03abd7673a.pdfIn PDF document text
    • https://bevowodawalejap.weebly.com/uploads/1/3/4/3/134363876/7384946.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486374/normal_600d8b545d638.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368243/normal_600b4d07e76f8.pdfIn PDF document text
    • https://jafedemigizol.weebly.com/uploads/1/3/4/5/134588438/3869a2301c38.pdfIn PDF document text
    • https://pepukuvem.weebly.com/uploads/1/3/0/9/130969690/vimosi-fafirose-wuwelipes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413693/normal_5fe022cc0309a.pdfIn PDF document text
    • https://cdn.sqhk.co/dabigewom/6OWhbWy/strategy-_proof_allocation_of_indivisible_goods.pdfIn PDF document text
    • https://cdn.sqhk.co/lewikokezina/ifjaehe/xipunezuxatuwinuralejivil.pdfIn PDF document text
    • https://cdn.sqhk.co/nutewakizi/ojbqjjO/spider_stickman_rope_hero_hack_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/vovomafejuwa/iisIhia/event_city_drive_in_cinema_manchester_halloween.pdfIn PDF document text
    • https://lekifusa.weebly.com/uploads/1/3/1/3/131382118/7be6d16496c7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pifutujotot.epizy.com/49720431161.pdfIn PDF document text
    • http://lojetewope.epizy.com/90777473714.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C3 5888 bytes
SHA-256: 46ec151d9772f75411d06d540722a364409774d80952ae019d7b213cc2b296bb
font_01_sfnt_off0000fcc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC3 12092 bytes
SHA-256: e31bbb404da30dc0fb66e97abeb19cd8263e8671655784c45620325804d0e2c6

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