Malicious PDF — malware analysis report

Static analysis result for SHA-256 834c857aa9ec3084…

MALICIOUS

PDF

80.2 KB Created: 2021-09-13 14:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 07111c52c3ded342703c5da53476dd7a SHA-1: 4a5d15372c7a14388c7e17a8a6c3b730f8121255 SHA-256: 834c857aa9ec3084574a470d45da22a26402884c5957e159d376b6ccf4072ac9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on various domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of using disposable hosting for a large number of links, suggesting an attempt to obscure the true malicious destination or to distribute malicious content through a chain of redirects. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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
  • 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://safe-international.com/userfiles/file/diriz.pdf
    • https://perkunasstudio.com/uploads/files/202109101931173585.pdf
    • http://bodegaadrover.com/userfiles/imagenes/14140424274.pdf
    • http://skomi.ru/img/files/file/mureforubanitanimajuxunon.pdf
    • http://www.haztartasigepszakuzlet.hu/pics/file/12817676184.pdf
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kivegabekozamizivajo.pdf
    • http://kavtas.com/images_upload/files/30329082867.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161328de5de522---sufaseza.pdf
    • http://ottotech.center/userfiles/file/zazufogiwexo.pdf
    • https://beysukonaklari.com/ckfinder/userfiles/files/20366014960.pdf
    • https://megacook.pt/site/upload/file/98325863669.pdf
    • https://atpl.aero/ckfinder/userfiles/files/60878075184.pdf
    • https://pepsima.biz/files/file/vimubijewafijemekaw.pdf
    • https://losungversorger.com/product/file/vuworujufiwosetotofav.pdf
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/wevuvupeb.pdf
    • http://fijiembajak.com/uploads/ck_uploads/files/62526624249.pdf
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kajenerokabukelomi.pdf
    • https://balbok.net/admin/ckfinder/userfiles/files/govoxurojofirowegilisajo.pdf
    • http://ellenia3.eu/userfiles/files/wutasapazunudotudol.pdf
    • http://grupafurman.pl/!mag2011/userfiles/file/xukopuzimolepa.pdf
    • https://hitourkorea.com/FileData/ckfinder/files/20210903_6B3E86F10D1FFFC1.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=bug+club+android+app
    • 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_off0000d609.bin
c83d4c80fa201ccb80243f487dad0403a1539aacb45ce7293a80db78d523777d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD609 10584 bytes
font_01_sfnt_off0000edd3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD3 16792 bytes
font_02_sfnt_off000105e5.bin
3649acedd57213393c265531f87be3c2d92f1deaa7ccbe7b69bcd726cac5b094		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105E5 17772 bytes

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