Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a2d1f3a8b9e72ee…

MALICIOUS

PDF

80.7 KB Created: 2021-09-23 09:05:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e5538634e24430ac956382af17fe42a5 SHA-1: 71ed33eba358b0bc6960f7fcd94109e4b8d86c24 SHA-256: 4a2d1f3a8b9e72ee5791783296c8b1aa9849e1376dd5cbeb808ede33e6fa50be
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The primary purpose appears to be directing users to a collection of other PDF files, likely for SEO poisoning or to distribute further malware. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • 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 http://virus-safe-zone.com/ckupload/files/nopogazevaxizoxobewolaji.pdf
    • http://taeguektour.com/FileData/ckfinder/files/20210909_24853427786F793A.pdf
    • http://spiregene.com/image/files/20210923_072241.pdf
    • http://www.sctiec.com/up_files/FCK/file/70714254555.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16137d7ee33c04---64703933697.pdf
    • http://hoangnampte.vn/quangbasanpham/app/webroot/upload/image/files/sebefem.pdf
    • http://moristas.com/userfiles/files/4859467118.pdf
    • http://glassick.com/userfiles/file/pinuzefuzarox.pdf
    • https://monyetjoget.com/contents/files/nokovafub.pdf
    • https://duvarkagidierzincan.com/userfiles/file/zatuziru.pdf
    • http://bige.vn/uploads/userfiles/file/jadugerobuvenerokigi.pdf
    • http://wangguanhardware.com/userfiles/file/nanofaxibilevigawawonunuk.pdf
    • http://packturf.fr/files/29559912121.pdf
    • https://tectrongim.com/uploads/file/rivosagobojuni.pdf
    • http://hzhuacui.com/images/upload/File/sokaravinipem.pdf
    • http://coffee33.ru/archive/file/33547224948.pdf
    • http://e-kva.ru/admin/ckfinder/userfiles/files/bukatujusubofu.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16147a76248e79---sixopanivijupaliwaluv.pdf
    • http://plaschke-partner.com/uploaded/file/24632467953.pdf
    • https://zemiigori.com/uploads/file/fivadawetafuwope.pdf
    • http://qigong.ru/userfiles/file/99276305268.pdf
    • https://trvstore.com/userfiles/file/13120707286.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=watch+top+gun+2+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d715.bin
b09fdde16116f76db4299a3bb3d46ced6de5b211a201949d97eff3da00d2acc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD715 17480 bytes
font_01_sfnt_off000104da.bin
749f8acd1728e231bff400c98157b8382751063e2f91ad0520420fb7c99f91cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104DA 10668 bytes
font_02_sfnt_off00011d66.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D66 16792 bytes

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