Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0d350ad56486793…

MALICIOUS

PDF

69.7 KB Created: 2021-09-26 07:59:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 57a2dd7fad12e48dc441d90319e70623 SHA-1: 1b95aafb678f5dac942c7274430107bd0e6639bf SHA-256: c0d350ad564867937ffce49561d3d40c0bb2bce98caa344effc1fe050f9d53ab
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • 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.
  • 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://buzmakov-ua.ru/admin/ckfinder/userfiles/files/wumewuxono.pdf
    • http://mastrodibaglio.it/userfiles/files/mojupatudawoxerugigig.pdf
    • http://sabaispa.net/userfiles/file/30810055404.pdf
    • https://vidaleve.net/ckfinder/userfiles/files/mevigedox.pdf
    • http://vegman-kzn.com/ckfinder/userfiles/files/56495357018.pdf
    • http://reguitti-engineering.it/userfiles/files/87625212604.pdf
    • https://pmfegypt.com/userfiles/files/1564492417.pdf
    • https://kultmotor.hu/images/files/sumoliroxapuwovuxeb.pdf
    • https://speedwayinfo.hu/uploads/file/wufag.pdf
    • http://ombs.ru/uploads/files/jivudevuveguwuzugazotukeb.pdf
    • http://wonsakai.com/uploads/files/21937879630.pdf
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/43509921063.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/2e61d33a65efc1bb428a444683525814/boxereroravefogenomemones.pdf
    • http://financesnadno.cz/upload/file/sarizuvozoliv.pdf
    • http://nzozkrowodrza.pl/uploads/editor/file/jupupavawirujepijalo.pdf
    • http://marathon-gexin.com/Uploadfiles/files/40442561468.pdf
    • https://mami-m.com/Uploads/userfiles/files/42566310071.pdf
    • http://abwlargo.com/uploads/files/xepipufoje.pdf
    • http://joyearland.com/ckfinder/userfiles/files/xusekanokimikisoranop.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417cedac27a---ganise.pdf
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/93222736212.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=vidmate+apk+2019+latest+version
    • 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_off0000af8f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF8F 16792 bytes
font_01_sfnt_off0000c7a6.bin
b8389b57ae0ba93382674c89865dc3041f0a5e769fa08126918b8caaf3ae3f50		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A6 11140 bytes
font_02_sfnt_off0000e1b6.bin
d97a6252c005205a9b2f4d09adf12d139af16cdab51029d23b8ac865a37968f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B6 15684 bytes

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