Malicious PDF — malware analysis report

Static analysis result for SHA-256 48d1f30de79da5ac…

MALICIOUS

PDF

63.5 KB Created: 2021-09-10 06:37:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c25e7a927a03499021119f5a979fd171 SHA-1: 4ea22ce6b52917fb19114bfd61ebb7e49de4860e SHA-256: 48d1f30de79da5ac220b07b0cc9dc462c4c42f1dadb849a0cc457841074c4352
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. It contains numerous embedded URLs pointing to other PDF files hosted on various domains, suggesting a distribution mechanism for malicious content. The presence of 'utm_term_redirector=True' and a high number of distinct hosts further supports the link farm classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8191

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://slkuang.com/v15/Upload/file/2021910955274316.pdf In PDF document text
    • http://candientu24h.vn/webroot/img/files/kupavakonemanepibipuvad.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/83897956792.pdfIn PDF document text
    • http://househouse.it/userfiles/files/wawesidomogerajikezaji.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/1992435631.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/ridewavonuzokabilanok.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/letis.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134db8177896---85151374860.pdfIn PDF document text
    • http://transgusto.ch/userfiles/file/1998587985.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/xibowugad.pdfIn PDF document text
    • http://emblem4home.com/UserFiles/Member/File/31927415496.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/mojizemav.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/duwenubosonexirepi.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/ridejurusulolepi.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/f1df6e4b89b6dd4e6f1a989718f000e1/gagosikaxetun.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/pixivosoxorowixuwex.pdfIn PDF document text
    • https://istanajp.coIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=boat+browser+apkPDF link annotation

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