Malicious PDF — malware analysis report

Static analysis result for SHA-256 af38a2c95d58b280…

MALICIOUS

PDF

87.4 KB Created: 2021-09-19 23:04:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5d16c911f3383a49f0d082943e673b38 SHA-1: 7c7153b1a397abb589b8d8e99bb4c2ad5b331fb5 SHA-256: af38a2c95d58b280086424922bc9b72c524ee5af556272fa23120ffe739c3bf0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The presence of numerous external URIs, many pointing to disposable hosting, indicates a phishing or malware distribution attempt. ClamAV and ML classifiers also flagged this file as malicious, supporting the assessment of a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://philabc.ru/uplcv?utm_term=romulus+my+father+pdf
    • http://hotelniagararimini.eu/userfiles/files/xomin.pdf
    • https://autoprofi.ua/userfiles/file/texova.pdf
    • http://nscenter.cn/upload/files/nunokiruselarekuwivojajeb.pdf
    • http://nt-module.ru/ckfinder/userfiles/files/29004520921.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/d239c420d511b7d5bceecd20346dbc68/wimiworawedeg.pdf
    • http://studiotipaldo.com/userfiles/files/wezimobemubuvorafobifer.pdf
    • http://quangcaowebsitecomvn.xemlaco.com/uploads/files/97356849209.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b93f48841---8208279082.pdf
    • http://begues.mobi/userfiles/file/8586659782.pdf
    • http://visusmarble.com/images_upload/files/57834776739.pdf
    • http://peneleos.pl/userfiles/file/73486083973.pdf
    • http://wefocusdesign.com/upload/files/86424162344.pdf
    • https://acrgruppe.de/userfiles/file/guborafuro.pdf
    • http://gpp300.fr/userfiles/file/22873658122.pdf
    • https://tenekedjieva.com/uploads/file/vasudonojufu.pdf
    • http://lapenya.cat/imgjovesnaves/file/3086969436.pdf
    • http://pphjako.pl/userfiles/file/rofina.pdf
    • https://www.hosotte.com/ckfinder/userfiles/files/5982844796.pdf
    • https://shirbandifelt.com/userfiles/file/66852707080.pdf
    • http://tv-sat.cz/userfiles/file/zojulabakeposadijije.pdf
    • http://le-nora.com/userfiles/file/sipejovilibexegixisugulub.pdf
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/kisuzogimipasesazan.pdf
    • http://coeb.eu/userfiles/files/memirog.pdf
    • http://bmfjhjk.friend-match.com/upload/files/42683121685.pdf
    • http://carscaso.com/js/upload/files/zunupilizejila.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_off0000ee81.bin
147d2cea4b3ef543bc4df3122888aa630afef7d12d71e3a84dd788e2060a8b2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE81 18936 bytes
font_01_sfnt_off00011e7a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7A 16792 bytes
font_02_sfnt_off00013691.bin
f9d28bdeee99b09ce71b9b0f6b80ede85143909f063936b4f714b0d6b9aac623		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13691 10824 bytes

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