Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e51b43b72e5e129…

MALICIOUS

PDF

73.5 KB Created: 2021-09-17 16:29:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d0f076e0d0e86b38aea9e611d40ffbbb SHA-1: 222b649315221c8c4b67330da13af398a6f2d516 SHA-256: 6e51b43b72e5e1292e48864444ddd878d6453cd14ca37038d7531b044edd036f
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the large number of extracted URLs suggest a phishing or content-luring campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7666

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 https://smidgel.ru/uplcv?utm_term=product+design+apps+for+android PDF link annotation
    • http://avalon-essenzen.at/userfiles/file/67177004917.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///9041523321.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/muretopin.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/files/88207100866.pdfIn PDF document text
    • http://ctcinsulator.com/uploads/file/dalogedesupogew.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/wokali.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/kanojosopukujux.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/99622728938.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/tubobozoboxofap.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/kesodajuxuwedarevojumi.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/36340055865.pdfIn PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/70528537806.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/wagixo.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/60890683314.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210908_5B1D1FF6F29E026C.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/tifak.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/jinugesamolapu.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/59217363409.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/10941996165.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309ea551f60---fusatoxifuxizibe.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/53454876895.pdfIn PDF document text
    • http://jawarakreasi.com/file/katebogopediwokutaroxekes.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/vujedexaxutitovowuz.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/pimev.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/karenazemipijoparokavo.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_off0000f15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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