Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cc0ecc6ecd801bc…

MALICIOUS

PDF

47.6 KB Created: 2021-09-08 14:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 81b645d8281613891d5958882c5d8e74 SHA-1: 91330c36bc7efc49711548c6cef4ba4e0a4fe2dc SHA-256: 7cc0ecc6ecd801bc7c77b67d8b87c789a298853a3f29bb48527be164c0b00435
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to disposable domains and are likely part of a link farm designed to obscure the true malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing or a trojan. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver secondary payloads or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9202

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • 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://smidgel.ru/uplcv?utm_term=simple+compound+complex+and+compound+complex+sentences+worksheet+with+answers PDF link annotation
    • http://shoreluxurylimos.com/userfiles/files/65071123051.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/boxeguvewo.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b5902196d---12856854809.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/42955247756.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/54572644358.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/7470747679.pdfIn PDF document text
    • http://vucert.vn/uploads/files/tazigoxubaxategurufes.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/xifanelunaj.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613223247517a---zezemepemekebaraliza.pdfIn PDF document text
    • http://www.polni.si/Images/files/94789365866.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/64735574204.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/xasakatirifusomolezetig.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/vanekisewob.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/petide.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/fuwebotejetovepub.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/26844682396.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/90731035168.pdfIn PDF document text
    • http://abwessex.com/uploads/files/romalukif.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/26958282026.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/pokonaxupi.pdfIn PDF document text
    • https://ismart99.net/upload/files/39415358598.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/laxijivajumofe.pdfIn PDF document text

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