Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3f23873be3159e9…

MALICIOUS

PDF

60.9 KB Created: 2021-09-17 17:21:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ae5c0b44647a6be6b9e09dd16791b6e8 SHA-1: c133943bfb2609c10538555ba03084c0f9e63abc SHA-256: d3f23873be3159e958c8a76aac7d763f72cd338edbee3da4c694705a8efbbd50
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to suspicious domains and are structured as a link farm, a common tactic for phishing or distributing further malware. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags this behavior. While no scripts were extracted, the overall structure and URL distribution suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6290

Heuristics 4

  • 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
  • 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 http://tycoonmedical.com/userfiles/file/sokolupizisuwu.pdf In PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/kafowozutotepavojivoteri.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/11898006064.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/17375382996.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/4649234900.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/56602285625.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109031535152429.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/61761940020.pdfIn PDF document text
    • https://waxparadise.pl/userfiles/file/fuwodenegog.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/kojiru.pdfIn PDF document text
    • http://exosushi.com/uploads/files/vifemadufepupas.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16134abb551b2e---taxosoj.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/96517262115.pdfIn PDF document text
    • http://dyneco.kr/userData/board/file/nedajugofipularofif.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16136295065ea0---bunufitedugazat.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/39497225607.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/pupuk.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/jifogedatonawuvetafid.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/debasosotawarupenikeri.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613b181880cdc---woriranomitaxufetega.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/letis.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/gijurusupabim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=magnus+chase+the+hammer+of+thor+read+onlinePDF link annotation