Malicious PDF — malware analysis report

Static analysis result for SHA-256 e09cfc25e69dbf3e…

MALICIOUS

PDF

68.6 KB Created: 2021-09-12 03:16:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a43d90d3290c09e98c763c2628a199a7 SHA-1: d96b8930b60602df94c471af67d03f437a67c2c2 SHA-256: e09cfc25e69dbf3e5479489394b77d06a771bff2d1b6b3fd1692cc5bfc0e8812
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, a common tactic for distributing malware or conducting phishing campaigns. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://studiotecnicolari.it/userfiles/files/26391932279.pdf
    • http://medianet2000.net/amm_prod/image_news_popup/file/17695534474.pdf
    • http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/49087842407.pdf
    • https://lexconsulting.ro/webroot/files/media/4700246136.pdf
    • http://ytbozhuo.com/upload/file/011354347695.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/e5714fcb5b5f76d2f99cd20f6ad7c1b1/vajeviwamuzexudolu.pdf
    • https://prestinieurope.com/userfiles/files/6942104347.pdf
    • http://beta-rc.com/upload/files/mofonazogerekokeduvivim.pdf
    • https://ausztriasi.spawellness.hu/upload/hirlevel/files/27217382496.pdf
    • https://thaiahpa.com/flash/files/73076323587.pdf
    • http://grafosaleservice.cz/images/fck_editor/file/nupexute.pdf
    • http://goodlack.cz/userfiles/file/70535521028.pdf
    • https://flavio-tonon.it/public/file/89171987564.pdf
    • http://the100voicesofgospel.ch/fichiers/newsletter/file/bugajomu.pdf
    • http://futimisdev.com/userfiles/file/ziluvepirimozezemumekuwa.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613157a2b383f---galawinevu.pdf
    • http://homeopathyhongkong.cn/files/rogowemuluxupitevorigad.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=henshin+belt+apk
    • 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_off0000ad02.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD02 16792 bytes
font_01_sfnt_off0000c519.bin
c00bcba829faefd24cce8155531e2b7d915ab69d7342ddfe1ef03c3856f2fe8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC519 10352 bytes
font_02_sfnt_off0000dc20.bin
9a7f17d655cc2ea56d9419945ad58fe0ba3bdba1aeda9adb459392b53f6203f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC20 16132 bytes

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