Malicious PDF — malware analysis report

Static analysis result for SHA-256 daf50434adefcfcf…

MALICIOUS

PDF

82.8 KB Created: 2021-09-19 05:29:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6172982cbabf682f0ecb2e19e8b3b856 SHA-1: 84cf3b67884da8e6ed8912722ff1a9bde1471356 SHA-256: daf50434adefcfcff219a5b95f0622f5d624316c1c309f0504d2a7609fd22013
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic firings suggest the document functions as a link farm, containing numerous external URIs pointing to potentially malicious domains. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://medvor.ru/uplcv?utm_term=king+avalon+dominion
    • https://digbijoynath.in/uploads/userfiles/files/34502687648.pdf
    • https://agriturismoilcolle.org/userfiles/file/80632417429.pdf
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/27093420735.pdf
    • https://terracell.pt/images/file/30047611197.pdf
    • https://francoisdaulte.com/ckfinder/userfiles/files/48853800151.pdf
    • https://nezrenpin.com/calisma2/files/uploads/79245625978.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/rtt4mbrnkk7ptqiv86co8d84a7/27610972242.pdf
    • https://nezrenpin.com/calisma2/files/uploads/69138164477.pdf
    • http://mikomisushiwc.com/uploads/files/55899961527.pdf
    • http://gangwonbnb.com/FileData/ckfinder/files/20210918_CE0F6B666FC00C92.pdf
    • https://felicitareonline.ro/ckfinder/userfiles/files/81932157626.pdf
    • http://tokyoracing.hu/userfiles/file/feninezadilizanexisa.pdf
    • https://psg66.ru/admin/ckfinder/userfiles/files/14014972852.pdf
    • http://becucci.it/userfiles/files/43094375150.pdf
    • https://mariellatriolo.it/public/file/17584063295.pdf
    • https://wronba.pl/uploads/wysiwyg/file/towopadokof.pdf
    • http://www.halpellet.hu/userfiles/files/47069075449.pdf
    • http://fandimnarodaku.cz/upload/file/digezitiragivuxun.pdf
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/27122914725.pdf
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33384034950.pdf
    • http://lg-palette.com/upload/files/12083365177.pdf
    • http://lighthouse-connection.at/myPix/file/zinipedenodase.pdf
    • http://greenbrier101.com/userimages/zofexu.pdf
    • https://dampinggame.com/calisma2/files/uploads/lofolusagifakam.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_off0000e1ee.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EE 16792 bytes
font_01_sfnt_off0000fa00.bin
526ee01bc18045ac38b19f583e9d810efa7b348d7211413b4159059ff3b3ee72		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA00 17744 bytes
font_02_sfnt_off00012770.bin
378d3822d30c961885ac9d5948c355ef8f45d216c53780299f808aa9c91f58d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12770 10152 bytes

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