Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce1ae4f20f81e622…

MALICIOUS

PDF

85.4 KB Created: 2021-09-13 13:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6548035dee4ead0b20cd43b8a75013ec SHA-1: f2b853cedfc7cbef1b38f585a7d7bff27bf05199 SHA-256: ce1ae4f20f81e622d234eec58d29c9d52f76022ab459a083d3cf7f84dc15e88f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to potentially malicious or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking readable content but containing metadata consistent with a generated file.

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://arabadvertise.com/userfiles/files/84921089082.pdf
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/17239358326.pdf
    • http://straps.by/ckfinder/userfiles/files/somomeluvexo.pdf
    • https://advantagelic.com/singhania/downloads/file/xegukekegejulobali.pdf
    • https://tainandentist.com/uploads/files/202109052204302846.pdf
    • https://fleuriste79.fr/ckfinder/userfiles/files/suluzidimobi.pdf
    • http://zap-interactive.com/uploads/files/sogurevudofakuleve.pdf
    • http://geoodwierty.pl/files/file/4752678686.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b758f34e69---93496086832.pdf
    • http://taiwan-tsai.com/upload/files/powurirowevesefuxawej.pdf
    • https://3rproject.eu/ckfinder/userfiles/files/48149932629.pdf
    • http://yevres.fr/ckfinder/userfiles/files/xipokapagojoguvowo.pdf
    • http://nzozkrowodrza.pl/uploads/editor/file/warerowejonosi.pdf
    • http://studioingegneriavaragnolo.com/userfiles/files/tuvisirutisega.pdf
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/98409101590.pdf
    • https://ximangcampha.vn/upload/files/pizafemamobaguzoxavop.pdf
    • http://bajajsports.com/userfiles/file/ranovenulemadajudilexovo.pdf
    • https://marblo.ph/app/webroot/img/files/revub.pdf
    • http://munnarteabungalows.com/userfiles/file/gulojenusibokenopen.pdf
    • http://belv.ru/userfiles/file/93761671496.pdf
    • http://kelt.pl/userfiles/file/60048893782.pdf
    • http://avanti.pl/userfiles/file/4348504845.pdf
    • http://hongdanhaudio.com/luutru/files/66475098435.pdf
    • https://terracetemayonetim.com/upload/ckfinder/files/kitexupagodudozuleb.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=php+website+to+android+app
    • 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_off0000ea60.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA60 16792 bytes
font_01_sfnt_off00010277.bin
caa0bb0b5908b65965e4f59267e099abe018433c3cab96fdbf12c7b320861abb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10277 10672 bytes
font_02_sfnt_off00011ab0.bin
7db4e7382028552762bd0ce641f10d2fee28317f49ee5c8438cdb0cc5419f4ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB0 17532 bytes

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