Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4fe1066a2478592…

MALICIOUS

PDF

71.3 KB Created: 2021-10-02 04:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a8b60201b84e4e2f05bb44b5dd05999d SHA-1: fce17692a7a0f8caeaeea3f06ec0913e678049ef SHA-256: b4fe1066a2478592f96214f2ca5b907ea9846abc96e1961f0113cc245046d5d1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is part of a link farm, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://metabolitplus.ru/files/file/ramoxojazetefuxoligaso.pdf In PDF document text
    • http://abwva.com/uploads/files/mokujapafijajefudo.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/54331852380.pdfIn PDF document text
    • http://kelsenator.com/userimages/gagudawomi.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/fipixigepi.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/6830013758.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/9625654028.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/74055723546.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/laliziridatujebosotexoke.pdfIn PDF document text
    • http://zespolbahamas.pl/zdjecia/file/20555558562.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da368d88a5---23703647175.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/29676341434.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/42553083355.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/nelesolali.pdfIn PDF document text
    • http://sinners-party.de/media/file/vowiwadi.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/kuwulovojifozasu.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/13318029664.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/39574147915.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ed7d27ab42---zasariwubameruwutilimijev.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/56717437551.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/58179821929.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/tasomulo.pdfIn PDF document text
    • http://client.diffuse.info/files/64920182517.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=android+18+porn+picPDF 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_off0000b2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2FA 17384 bytes
SHA-256: d3068de2e083d7d6833edfe4ac250d5fb91b2c4fe0504f41bc7e2331914698f8
font_01_sfnt_off0000df61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF778 10144 bytes
SHA-256: ee615b27ef9e34f2884d35ade1a1ba39e5138bf69a784eb37501d1419737f325

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