Malicious PDF — malware analysis report

Static analysis result for SHA-256 219693da5ddf66f0…

MALICIOUS

PDF

80.3 KB Created: 2021-09-16 11:46:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b33dddf5b6b6d3c9fdc19f7fe093e249 SHA-1: d2ab3d3448319de185f04256f466097bc2ea78ee SHA-256: 219693da5ddf66f0582f135182e6db0b5e19a7e9395325d73a1149aa5f4a262d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high heuristic indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.nomorcantikjoss.com/file/saxat.pdf
    • http://cx-gl.hu/images/files/lijavavebewazefefijoju.pdf
    • http://guojingmall.com/userfiles/file///bexusoguditeti.pdf
    • http://turinhotelcompany.com/userfiles/files/309290924.pdf
    • http://qdjshg.com/files/file/91770760693.pdf
    • http://www.bc-arman.kz/ckfinder/userfiles/files/taniwopuwoz.pdf
    • http://stefanourso.com/public/userfiles/file/29232080795.pdf
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/87632637947.pdf
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/punuwe.pdf
    • https://yocarbroker.com/upload/ckfinder/files/litojidewuwivetenuwimo.pdf
    • http://transbur.ru/admin/ckfinder/userfiles/files/dudipemojufesuje.pdf
    • https://godahoian.com/app/webroot/upload/files/kekivali.pdf
    • http://kimhoatra.vn/upload/fckimagesfile/lafumagupovebobitigipume.pdf
    • http://poetische-malerei.de/web/editor/files/gatazamo.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/b2ffa9440c33d439f10d02207991e1f8/85513507345.pdf
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/dovozofefojarikizorizabuv.pdf
    • http://spc1991.com/ckfinder/userfiles/files/99362854768.pdf
    • http://gsnursing.in/ckeditor/ckfinder/userfiles/files/tunofaz.pdf
    • http://bukharaalpharetta.com/sites/default/files/file/ronufolivoputit.pdf
    • http://auto-spec.ca/fck/file/domeledonuz.pdf
    • http://thebankcardservices.com/uploads/files/dotejobekupubemewo.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613f36eec73ee---38852402009.pdf
    • http://otevrel.eu/ckfinder/userfiles/files/68496086445.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=android+gps+programlar%C4%B1
    • 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_off0000cf44.bin
3047c97e6a95d466c9cd9f027ff5214e99f788734928226500fe252ee402b945		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF44 19648 bytes
font_01_sfnt_off00010246.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10246 16792 bytes
font_02_sfnt_off00011a5d.bin
766ff0ac83f623e1a28c3c5e7e87b24595d6da081b6a3772c85e2d3024149024		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5D 10532 bytes

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