Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f131dfd803da97c…

MALICIOUS

PDF

66.5 KB Created: 2021-09-19 10:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a200afbbefed9e996870943c723fbd39 SHA-1: d587b262ed0b4b3bba1a5ed23e501728d643e2b1 SHA-256: 3f131dfd803da97c7195f8046cb9bfd3f9273147cd20ba659476d8e32925d20f
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to act as a link farm, likely for phishing or malware distribution. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4625

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.
  • 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://mmckno2010.zkosuchdol.info/files/letubivaparepem.pdf In PDF document text
    • http://stefanourso.com/public/userfiles/file/xidaxuguzurunikajo.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/42537400753.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52930203263.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/zamarudagoluvukavone.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/278651029.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/1919682785.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/najokawur.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/61223164924.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134735838596---fipopavibakusuk.pdfIn PDF document text
    • http://adveotec.com/img/file/rirowiwosizogoletojogume.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/waberox.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202109180549112155.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/7239039728.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/ragijabid.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/39600900768.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/vefekivaxopulefi.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/gulidon.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/19270461206.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109031036451074.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/buginunevutono.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/c983f7d111ac29c8f6483fe684d1abdb/25091510714.pdfIn PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/86233569329.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/porukozunaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=gta+5+cheat+to+lose+cops+pcPDF 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_off0000ca01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA01 10348 bytes
SHA-256: e937c811f1d279be2dbdfb7179e373f9c3bbccb10ed7392ef1ac182a00e10df8
font_01_sfnt_off0000e1ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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