Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4c3ff14e2ee9395…

MALICIOUS

PDF

64.0 KB Created: 2021-09-27 00:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1cefd23480f32f4f9139aa772ffa3d68 SHA-1: 6dd6ae493dfd1abecef4f32c0a23c134e16b312a SHA-256: b4c3ff14e2ee939530f23ca187d65903552f2f550e1fdbb81388a34c6759f17a
124 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm or redirection scheme. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a tactic of using many distinct, potentially disposable hosts to obscure the true malicious intent, likely to distribute malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7092

Heuristics 4

  • 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 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://eqletstalk.com/uploads/files/202109252100078809.pdf In PDF document text
    • https://itscebu.com/upload/file/20210902190635.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/30674888586.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/71078638636.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/46643533600.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/85838934558.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///8061276111.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/53124628745.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16150e698cc5b5---pedelepik.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/gotinadodoxowi.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/87729702715.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/6de6cfb573ce6d0f84e0169aebce102b/baxivonenufarorusajut.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/15067605756.pdfIn PDF document text
    • http://chinalabware.es/d/files/bajidulezetubunabak.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/xiwijowenizanipun.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021090723370292.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/20273165438.pdfIn PDF document text
    • http://allier.proximeo.com/ckfinder/userfiles/files/8122717597.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1630928735.pdfIn PDF document text
    • http://efcosmetic.com/uploadfile/files/22650072679.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210927_F3DB0EA12516A267.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=download+super+mario+2+hd+mod+apkPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ad52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD52 17604 bytes
SHA-256: 7a07fbe31c7246bd8cbd2e66a243379ff084ecec2201fc9732673670611c9c80
font_01_sfnt_off0000d996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD996 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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