Malicious PDF — malware analysis report

Static analysis result for SHA-256 085558b5e04952e1…

MALICIOUS

PDF

65.1 KB Created: 2021-09-14 13:20:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 95eb87ec6f67f18dc7a0430a554d470e SHA-1: 5d7c13110008e1ff6c4f0c901b461a092a9c5261 SHA-256: 085558b5e04952e15a9ba515dca38cf931e7ba4802a3f4f77678a07cc6b1249e
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malicious content. The primary attack pattern involves directing users to a collection of external PDF files hosted on various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9620

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 http://amdind.com/userfiles/file/8703626099.pdf In PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/47773450505.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/5aae20cd43a8f79146ba116896b8164c/goropopozew.pdfIn PDF document text
    • http://thevalleytrader.com/files/22862839773.pdfIn PDF document text
    • http://hstairan.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/45009577535.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/98561716303.pdfIn PDF document text
    • http://bernendorf.ru/userfiles/file/mudugurukoxegebez.pdfIn PDF document text
    • http://trip-sale.ru/userfiles/file/guxonazewovuforubikoz.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/tevapiwikerigataxu.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/pidavesebivigedevevat.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/46672474413.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/modowawemi.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/bepopimexizesasulifalu.pdfIn PDF document text
    • http://retailcop.ca/files/33013373162.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f15d61e11b---40478408464.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/28064814250.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/33438267142.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/73449836404.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/10574906492.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/55344922272.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=flappy+bird+cheat+codesPDF 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_off0000d1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1