Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8608f31ae0f41bd…

MALICIOUS

PDF

79.7 KB Created: 2021-10-19 12:27:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 77a90832d15ae6a6b0a725530f608258 SHA-1: a2d039ae06c9f3388971bb0e159348fa91d33ece SHA-256: a8608f31ae0f41bd79de364145e305eeaa7d144efa412eb8b1f2dcda82cc6dfc
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to host a large number of links on disposable domains, a common tactic for phishing or distributing further malware. The ClamAV detection confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3497

Heuristics 5

  • 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.
  • 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://laborke.ru/uplcv?utm_term=pokemon+x+game+rom+free+download PDF link annotation
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16152f9c861432---1899301258.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/kosumulopukufesim.pdfIn PDF document text
    • https://thietbidiensino.vn/media/ftp/file/30510867156.pdfIn PDF document text
    • http://zgic.ru/!upload/files/kalumik.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/gotozuvexeruwodobepi.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/gigadajadenitizonaro.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/gapatajolegarexipuzapivi.pdfIn PDF document text
    • http://dsfly.com/uploads/files/20573106935.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/09/12/19773440083.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/10442569301.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/fijuxojuxe.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/kanefimupuw.pdfIn PDF document text
    • https://cathita.vn/upload/files/9108596712.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021100910513826.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/27174741293.pdfIn PDF document text
    • https://hoya.mobioptika.hr/UserFiles/file/wowujelibe.pdfIn PDF document text
    • http://modero.vn/upload/files/67122584005.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/tojuwunewigolamifewejosu.pdfIn PDF document text
    • http://agavietnam.com/img/files/80789484923.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/jopezomedejagenovawaluw.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/32689557996.pdfIn PDF document text
    • http://jessica.yelivery.com/cote_dor_import/admin/ckfinder/userfiles/files/95555562970.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/81598832407.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ead6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD6 18524 bytes
SHA-256: b8f6bcaeb67eeccc73bfe1bf80ae551e50d58629881f12b2e2e18d17ba9ed506
font_01_sfnt_off00011b21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1