Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a98a1e680d7cb17…

MALICIOUS

PDF

76.7 KB Created: 2021-09-13 05:00:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e5ccabb3fa1118675178cb47da8154de SHA-1: 3eec8ff2da525ea6e663fed67f83e39c0467af90 SHA-256: 8a98a1e680d7cb178fe610e75f9566bdd1365bd780ffb412923f4944336aba1d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on disposable hosting. Multiple external URLs are embedded, suggesting a phishing or malware distribution attempt. The PDF structure and embedded content, though heavily obfuscated, are consistent with malicious PDFs designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=excel+to+pdf+converter+software+download+free
    • https://aayams.com/userfiles/file/22589853395.pdf
    • http://hsound.ro/images/custom/file/butitovereserusa.pdf
    • http://4els.ru/uploads/images/files/37453902183.pdf
    • http://thietbikhachsanvinhhung1.com/upload/files/50604399139.pdf
    • http://lionsmarsala.it/userfiles/files/58352204735.pdf
    • https://maftplayer.net/calisma2/files/uploads/32864850875.pdf
    • http://esen-life.com/userfiles/file/jagivijir.pdf
    • http://rooptex.com/uploads/mabazizoxutu.pdf
    • http://one9five.com/userfiles/files/tewisogebi.pdf
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/14368638195.pdf
    • https://bacsionline.net/userfiles/file/94701827227.pdf
    • http://01host.ru/userfiles/files/tomidafudunijuxujukufo.pdf
    • http://olddieselparts.com/ckfinder/userfiles/files/49884688464.pdf
    • https://globalathena.com/ckfinder/userfiles/files/95608527112.pdf
    • https://greenfuturevietnam.com/Upload/files/66842211542.pdf
    • http://maasmartcity.com/userfiles/file/9303788190.pdf
    • http://standdominica.org/files/files/pijofurudetuduveniv.pdf
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/61406775316.pdf
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/gokukibadado.pdf
    • http://konditsionery-reutov.ru/upload_picture/file/jugirazisof.pdf
    • http://ned.ru/uploads/files/57800605031.pdf
    • https://edarky.net/data/file/pubatibeti.pdf
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/59177923943.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_off0000c68c.bin
1abf31f5a6cbbf67d2b584c4c8db68b30b6584a52f48876e4008532859d2981d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC68C 10760 bytes
font_01_sfnt_off0000df91.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF91 16792 bytes
font_02_sfnt_off0000f7a3.bin
f2415df95752b6bce4de860141e18225518fa7da8b7a7d77db48ca70b8fdaa97		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A3 17724 bytes

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