Malicious PDF — malware analysis report

Static analysis result for SHA-256 951b58d4e947b88d…

MALICIOUS

PDF

79.5 KB Created: 2021-09-19 08:19:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3b406fbc61afc855cf852636432466d9 SHA-1: 1e8dc7186c5f1b446b00a8cd3bb8a293dbb48f9f SHA-256: 951b58d4e947b88defa64e6a8f903723479c2153574356ba6ca3a3432ea455fc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://chcial.ru/uplcv?utm_term=top+game+android+tablet
    • http://tamker.hu/userfiles/file/namazunenizusipixa.pdf
    • http://stopguepes72.fr/userfiles/file/61264977011.pdf
    • http://parvazyab.net/basefile/api203/files/xazeresomilukogojijaje.pdf
    • http://rehahomecare.com/upload/editor/files/befoxizojorexopim.pdf
    • http://mobitransjogja.com/files/sameno.pdf
    • http://automozg.by/upload/editor/files/13516311970.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401768cc7b5---rabarifuwejofagivinu.pdf
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/75401701596.pdf
    • http://hibertek.com/image/files/20210910_123813.pdf
    • https://doublehaircenter.com/upload/ckfinder/files/55824554686.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614256585dbcf---32678885297.pdf
    • http://cuanhuadanang.vn/uploads/image/files/84580407208.pdf
    • http://travellightnepal.com/userfiles/file/malejinemarifageb.pdf
    • https://www.puskinas.lt/ckfinder/userfiles/files/18814606564.pdf
    • http://traiteurluc.com/userfiles/file/91109911539.pdf
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/vixinugebemovudar.pdf
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/fimipivitav.pdf
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/zakile.pdf
    • http://improntediteatro.it/userfiles/files/nupezetanetejebofuxugop.pdf
    • http://arcstema.com/userfiles/files/83436533573.pdf
    • https://mamo-tato.ro/userfiles/file/36836487089.pdf
    • http://fli.edu.mn/ckfinder/userfiles/files/52199245183.pdf
    • https://chungangroup.com/uploads/files/202109050756338216.pdf
    • https://ev-owners.jp/userfiles/files/31955772714.pdf
    • 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_off0000d600.bin
d604fe196550cbaa555eeebf26a38ead0c083d08f80883dac02a1fdac2bae823		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD600 10672 bytes
font_01_sfnt_off0000edf3.bin
2004d7fd43dbbfbd55431e52c59288eceaaa44bf9c5ff12bbad427b2d8e78d32		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF3 16480 bytes
font_02_sfnt_off000118b6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118B6 16792 bytes

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