Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e29ef83dafc0048…

MALICIOUS

PDF

87.9 KB Created: 2021-09-17 12:59:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 61d992e335a647624167424ab1b40203 SHA-1: 57be7db79ede6eb0bff9dc89c13e1503c713f2dc SHA-256: 0e29ef83dafc00488f79fad1c251ce1664f92e249ec5bdfa034edcf34be2aae6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are used in a link farm configuration. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://infrive.ru/uplcv?utm_term=blank+space+copy+paste
    • https://ph789.com/pinhsuan/files/file/43649924541.pdf
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/68930350080.pdf
    • http://coreaad.com/DreamDataUpload/file/34399506660.pdf
    • https://gangnampools.com/contents/files/zemanos.pdf
    • https://rh-h1tapi-turbo.com/contents/files/vugajok.pdf
    • http://tinhdauvietnam.vn/upload/files/nepowutifodafojufam.pdf
    • https://inunekocp.jp/mailmagazine/upload/files/16680615977.pdf
    • http://446888.top/userfiles/file/sozomi.pdf
    • http://edeins.com/userfiles/file/20584402923.pdf
    • https://10fci.org/userfiles/file/sonododamomokod.pdf
    • http://sushinamu.com/uploads/files/29893473409.pdf
    • http://austria-ex.com/images/blog/file/wimizonagezovefer.pdf
    • http://birkhoffhi.com/userfiles/files/32264268051.pdf
    • http://bbmeti.it/userfiles/files/vobomunomu.pdf
    • http://kompassztuki.pl/Image/files/72936216359.pdf
    • https://tele-video.ru/upload/files/serovud.pdf
    • http://ketnoikienthuc.com/upload/files/dutimipog.pdf
    • http://esoftland.com/userfiles/file/joduxexalemavobovakut.pdf
    • http://medwin.kr/userData/board/file/pumelukekavanonagijuwodim.pdf
    • http://amoy-art.com/Upload/file/kekevonivega.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161300eeee3b7e---28844154035.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614403832708f---gexovejebaratinofoxokoso.pdf
    • http://starma.pl/files/file/kunepepaziwekatenezegir.pdf
    • https://beltamas.by/content/Files/pimovitato.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_off0000f031.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF031 16792 bytes
font_01_sfnt_off00010848.bin
98de454ecbaf1ec18556cfb6ae384e6574a640a1ff523f28ff1cf6a9a3073aff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10848 10436 bytes
font_02_sfnt_off0001202c.bin
4dfcb686ad3a235aa73bbae7cc11bd2a3ced61cb29b42bb9d500720888ce9ccb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1202C 19052 bytes

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