Malicious PDF — malware analysis report

Static analysis result for SHA-256 92b20c0142f9f1b9…

MALICIOUS

PDF

78.1 KB Created: 2021-09-22 11:59:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b39c7bf7a4a075df920ed009e2bed958 SHA-1: 543fefd2f22a209d33c477e55e1a679b0dce12aa SHA-256: 92b20c0142f9f1b9bb5030b366939dcfe92312b4e11ccf58fdf6f90fdd385089
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. It functions as a link farm, directing users to numerous external websites, some of which are hosted on disposable domains. The presence of UTM parameters in some URLs suggests an attempt to track user engagement with the phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6194

Heuristics 4

  • 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.
  • 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://soportedevida.mx/ckfinder/userfiles/files/loselikarobedenu.pdf In PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/moborekujop.pdfIn PDF document text
    • http://milkyway-vn.com/upload/files/32962705938.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/zoliwujed.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7ff0ade21---tebarigagofiridorododujub.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/79135092153.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/88074884286.pdfIn PDF document text
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/75280283058.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/sabizikutix.pdfIn PDF document text
    • http://mobil-tech.com/files/vadibikez.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/72684576422.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/67819528624.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/xiboteduwas.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/lises.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/sobejefoxo.pdfIn PDF document text
    • http://htygroup.com/upload/files/nufop.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/27868718969.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/14133344998.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/basekabetusiwesinolewamuk.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/puzijetin.pdfIn PDF document text
    • http://pro-group.ru/userfiles/file/bowafosiserojujoke.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/tejujorosidalitonuxuvupov.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399259457ff---21354376934.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=deadpool+2+full+moviePDF link annotation
    • 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_off00010e7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7A 17880 bytes
SHA-256: 9ad5e8bd0045953f6658540197e79b0df201aac8a3d74fa9e1a4cb54417ec7ea

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