Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b95f69b3fe3bf70…

MALICIOUS

PDF

72.0 KB Created: 2021-09-11 07:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b72fce37e0de6c12b674b4dde55b7106 SHA-1: 4029ec3166962d40494f60dba511c60bb4b11a7a SHA-256: 8b95f69b3fe3bf703645f888f6b737b8be8e5a9ee7ca49c8e30fbb49483a25db
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic firings indicate the presence of external URIs and a link farm, suggesting the document's purpose is to redirect users to potentially malicious sites. The ML classifier and ClamAV detection further support its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6503

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.
  • 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
  • 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://www.hzkontejnery.cz/ckfinder/userfiles/files/sunakoximaxevuw.pdf In PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/ede3da070b06d5ddab6ced1e1d475b0e/zifiraragisitisexanukuge.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/32163220791.pdfIn PDF document text
    • http://homeopathyhk.com/files/jezogejigifiwujidijes.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/69662287651.pdfIn PDF document text
    • http://www.dgtrans.co.th/login/ckfinder/userfiles/files/takeke.pdfIn PDF document text
    • https://aksusu.com/upload/files/fasetetazuranazovi.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/moximit.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/6j60ihuc7febeusp67ec4svmln/50894544532.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/1021298594.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/6514015230.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/54068908879.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/topegixuwogazu.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/legovubutufufezu.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/86071397068.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/pifog.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/56386397291.pdfIn PDF document text
    • http://nincity.de/inline/file/51411649745.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021091009504921663.pdfIn PDF document text
    • http://yuha.be/_files/file/vurojikipinosineb.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/10143689087.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/jututumozedo.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/17228323082.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=resident+evil+4+mobile+game+downloadPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE054 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF866 18144 bytes
SHA-256: 8fca1950a1812faf1cb23e6f80e05322afb3f22a32971394d0f28865d2204f14