Malicious PDF — malware analysis report

Static analysis result for SHA-256 b50f9be5eb67a2ce…

MALICIOUS

PDF

81.7 KB Created: 2021-09-18 01:48:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 968905f827e7ae0ad49fce92057d9f19 SHA-1: dbbd3ad27864fd2612044bf601451eeca14d1c41 SHA-256: b50f9be5eb67a2ce5efdbfbc4c022ccb009ce680f1ed012de39ce2c60ade3979
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, indicating an attempt to execute code within the PDF viewer. The PDF also acts as a link farm, directing users to numerous external URLs, many of which are hosted on potentially disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded JavaScript and external links points to an attack pattern involving client-side execution and redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://atletika-pardubice.cz/files/file/wirogukazetikudorodo.pdf
    • http://logiccpacma.com/ckfinder/userfiles/files/45712471377.pdf
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/29729000112.pdf
    • http://ledseoul.com/userData/board/file/56131233921.pdf
    • http://koreabulk.net/userData/board/file/jerofevi.pdf
    • http://musthighschool.mn/ckfinder/userfiles/files/68098872935.pdf
    • https://edex.co/userfiles/files/45686451244.pdf
    • http://carnow.jp/js/upload/files/4018036921.pdf
    • https://apotekatia.ba/fajlovi/32496692506.pdf
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12201624276.pdf
    • http://tokyosushilohaus.com/uploads/files/sibovivuk.pdf
    • http://apismorava.eu/docs/24817491335.pdf
    • https://247christianity.org/fckeditor/userfiles/file/483101928961631712135.pdf
    • https://fullmagicweekend.com/ckfinder/userfiles/files/89103962122.pdf
    • http://drprdesaihospital.com/uploads/73989266431.pdf
    • http://designpavelzapletal.cz/files/file/wexetibojesizixize.pdf
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/seziwaxadav.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613100ca5ae0d---fusokesuzomomoladuf.pdf
    • http://liccuza.ro/stiri_files/file/zobusu.pdf
    • http://opuspointpartners.com/ckfinder/userfiles/files/20582594963.pdf
    • http://studiotecnicodama.it/userfiles/files/dizowisomoki.pdf
    • http://rm-centr.ru/uploads/file/27713813132.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=bloons+tower+defense+fps
    • 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_off0000d918.bin
76b4e7d9184f3c382a04445124cacf241cb24d9dbb3a50197f7c1028a9351f4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD918 18516 bytes
font_01_sfnt_off000109b7.bin
1067daf17980533a3d0f6279c77b99c3b21f86e7e9c6e3c8cb3f7c399ac4d77c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109B7 10376 bytes
font_02_sfnt_off00012166.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12166 16792 bytes

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