Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f2d9512448b0d91…

MALICIOUS

PDF

65.6 KB Created: 2021-09-20 05:26:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8e4ae45ac12ed467577243ed487bd661 SHA-1: a7f2934ab609e0850c13072b036472e60ef6e523 SHA-256: 6f2d9512448b0d915ac014dad74b288bbb66edb6a4e73e8367cbd582f6d5ec80
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script likely redirects the user to a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous unknown URLs extracted. The ClamAV detection and ML classifier further support its malicious nature, pointing towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7095

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 http://yugang360.com/upload_fck/file/2021-9-3/20210903025732747064.pdf In PDF document text
    • http://www.optimizecost.com/admin/ficheros_fckedit_subidos/93927273350.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147aac2c3eae---jaliwejewesafituvegojofe.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/nuzarilarapoxelidasem.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
    • http://khonggianmang.com/upload/files/99871674329.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/tutodurejonovujuvoxusak.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/72365239505.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/xokawetizilukonekupele.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/zuxiganokatulogalade.pdfIn PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/kufam.pdfIn PDF document text
    • http://mitroc.com/userfiles/file/47248350542.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/48900815898.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/bewavobobovijokukamiba.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/mobutijid.pdfIn PDF document text
    • https://rjpexport.com/files/katurirof.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/dikawigulot.pdfIn PDF document text
    • http://vongtaygiay.net/media/ftp/file/xowivakujupi.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/taxobivofof.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/guwosib.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/73206911605.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/13658332906.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/bonovipisiwusolajikapuzut.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/30571134758.pdfIn PDF document text
    • http://batistar.fr/userfiles/file/kikemow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=invincible+free+to+watchPDF 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_off0000d180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD180 17448 bytes
SHA-256: f72fc9538e69799294aa0742956d599f6c099d59ec51bf9caba71d13e4d355fa

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