Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6c43068e070083f…

MALICIOUS

PDF

62.3 KB Created: 2021-09-09 23:55:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 68fecafec79a104f136189636c6c29ae SHA-1: df97567ddf2675fb5872ac4ad8f65421f37876c5 SHA-256: f6c43068e070083fb94759987edc6eb07f793361207cf9b8bf56de075fc4bbb0
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, a common tactic for distributing malware or conducting phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to lure users to malicious sites, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7942

Heuristics 4

  • 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
  • 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://coretry.ru/uplcv?utm_term=adventure+game+puzzle+video+game+best+android+games PDF link annotation
    • http://orosweb.hu/ckfinder/userfiles/files/16934125919.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/85446369433.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/83847048200.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/bozojevogozekubegakuf.pdfIn PDF document text
    • http://finara-v.com/file_media/file_image/file/66291125923.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/tugotopaf.pdfIn PDF document text
    • http://sinostandards.net/upload/files/gugomejuvujinimepizodika.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/39559671496.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/54081829067.pdfIn PDF document text
    • https://kimcert.net/E/file/wilefifu.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/91046967726.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16138b8a3f3a9e---66827505145.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/80405179889.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/8583ccj9c01c9ao27nevrts339/35613995442.pdfIn PDF document text
    • http://workontext.ru/media/file/27987846808.pdfIn PDF document text
    • http://houtackers.nl/userfiles/file/vabawazapulilalidifisuf.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/xudetudoveveruzefito.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/65567041523.pdfIn PDF document text
    • https://yellowstonewildlife.com/97319807239.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/degezibelukopadojijuv.pdfIn PDF document text
    • http://vrakskodamnetice.cz/file/temumefebuzazixuxowutoro.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/69370369772.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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