Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a9230abb481b814…

MALICIOUS

PDF

63.7 KB Created: 2021-10-02 22:22:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d6450f4a641eb20fb71f6357c60f855b SHA-1: 0349263ef1713b52bdffa39de0f63984cde49cfc SHA-256: 8a9230abb481b81492b4b04b5d09585bdfe382adfc54a7b436b0124eeaafec10
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a large number of embedded URLs, many of which are hosted on potentially disposable domains and utilize UTM parameters, suggesting a link farm or phishing campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. While no scripts were explicitly extracted, the presence of numerous external links points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6133

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://chcial.ru/uplcv?utm_term=step+up+the+pace PDF link annotation
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/161427f936242b---19957723703.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/nobalakizerolekabopafeg.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/puxikadotep.pdfIn PDF document text
    • https://cristalensi.com/public/File/24563295843.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/6439377800.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/71942575358.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/31635104366.pdfIn PDF document text
    • http://all-premium.com/user_file/files/88068759335.pdfIn PDF document text
    • http://chargooshads.com/images/upload/files/12983433747.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/mojonofidulawomu.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/bukamegegut.pdfIn PDF document text
    • https://alternativecarrepair.nl/userfiles/file/godatewaviroda.pdfIn PDF document text
    • https://sskundal.com/userfiles/file/23009410147.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/motuzazupimejagepobefa.pdfIn PDF document text
    • http://freetds.net/userfiles/file/93901662469.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/golutanebibusatup.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/515733or6hptp0mo8tr78vnlb3/92310426596.pdfIn PDF document text
    • http://cke.hk/userfiles/gevusisofafidal.pdfIn PDF document text
    • https://iword.de/userfiles/file/16703181712.pdfIn PDF document text
    • http://imi.vc/upload/files/17799301622.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///12056392718.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/redaxipelijitojubefo.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ac56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c46d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC46D 10016 bytes
SHA-256: 16653a286b0aaf31091645d3e8bf890849d89be310449871a487efac387d589b
font_02_sfnt_off0000dad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD3 15260 bytes
SHA-256: ef832e6d5b63aa6a75e97e916f335345ffebab0ce8066453b885d98c8ca78345

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