Malicious PDF — malware analysis report

Static analysis result for SHA-256 86de4cf3e6051ccc…

MALICIOUS

PDF

68.8 KB Created: 2021-09-21 03:28:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2e07fcfd4a0fcc853f6ae1a9a5de102b SHA-1: 0f9db579022b853d3c02162689a658c67cb75bb8 SHA-256: 86de4cf3e6051ccc5f67f965533893399686be72e51db0044e0afaa854c995dc
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution through these links. The embedded JavaScript may be used to further obfuscate the malicious activity or redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=names+that+start+with+g+and+end+with+e
    • https://mldom.xyz/web/img/podborky/files/99303761560.pdf
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/pireb.pdf
    • https://luckysurface.itweald.com/uploads/files/614818e582861.pdf
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/xujonalutawovi.pdf
    • http://mega-stainlesssteel.com/uploads/image/files/pebogaxizijajezexiko.pdf
    • http://atsolution.org/userfiles/file/20210915225427690954590.pdf
    • http://uitetenindex.nl/images/uploads/ruxukexo.pdf
    • http://shanghaicruiseparty.com/uploads/file/4420456561.pdf
    • https://tpk-m.ru/files/file/7260658746.pdf
    • https://medicabg.com/uploads/wysiwyg/files/39508944673.pdf
    • http://bckbytow.naszbip.pl/img/upload/files/12608733746.pdf
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/pexadokam.pdf
    • http://xn--h1acbpobggs.xn--p1ai/data/files/fasepanelovilomenev.pdf
    • https://binarbaid.com/public_html/userfiles/file/21282340773.pdf
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/90495498850.pdf
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/wovuxotofiwenuji.pdf
    • http://shuimotongyuan.com/userfiles/file/4657548863.pdf
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2fc0600a5---golijizapeluxi.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142ded401a23---72185627193.pdf
    • http://reicar.dk/userfiles/file/wakuxitefutixaxiwiro.pdf
    • http://cnhhgj.com/upfiles/userfiles/file/duguka.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_off0000af8d.bin
d84ddb22026af5accce783ec29b6a0af5342b3cb337e74c3b87374bc3c4bf63b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF8D 14976 bytes
font_01_sfnt_off0000d56e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD56E 16792 bytes
font_02_sfnt_off0000ed85.bin
52b47c15b5df706e7f1290a0eed6574d2ecdbe205807094493d4d96cff69375a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED85 10592 bytes

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