Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f6b0ead94583b89…

MALICIOUS

PDF

81.5 KB Created: 2021-09-17 20:20:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1f2c9f542179a98e7f08d8bf9aa400d5 SHA-1: a647d676555731711fae0c34c0d69a48eec0b399 SHA-256: 4f6b0ead94583b899251864917ad088b5e49b914c80c47284df442f952725746
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm structure. The PDF contains numerous external URIs, many pointing to disposable domains, suggesting a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://haitrungkim.vn/uploads/userfiles/file/75931315896.pdf In PDF document text
    • https://tempatpasang.com/contents/files/45770458545.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/49040843991.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/f8f2398f630fdcd169cdca94b406928b/70980909119.pdfIn PDF document text
    • http://lechioutdoor.com/userfiles/file/76657981088.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/pamezukuw.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/fefipotedezum.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/1221688302.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/35804856879.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/kosusamegagamexutefurata.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd4f7a7f3e---lamazaxiwabisa.pdfIn PDF document text
    • http://kkagro.com/media/images/upload/file/tufuribuseribipo.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/lajajadole.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/99231626866.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///zemodo.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/pazepimisuvu.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/18927444402.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1614234e050edd---mikerikizajifu.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/zarurunatobukawav.pdfIn PDF document text
    • https://fu-ko-property-agency.com/webroot/editor-uploads/files/loveped.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=remove+acsm+drm+onlinePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A5 10544 bytes
SHA-256: 7852a87a282f6bec2a83cc17789e3dcc7034cac62843c942e68fcad0f05d4afc
font_02_sfnt_off00010aa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA0 17888 bytes
SHA-256: 12ea2bc6d902171046a7651da1d2d18285ba8c98da6fa2de184560d43f96a16c

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