Malicious PDF — malware analysis report

Static analysis result for SHA-256 c28abad82dbec144…

MALICIOUS

PDF

54.6 KB Created: 2021-10-18 17:55:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e8c3aec37b7db1e6782823b251032806 SHA-1: a32686f2816cc223e851b15e58612c57d5164851 SHA-256: c28abad82dbec144df6f6efd6c90db3dbd2a84375fba695c2e17f2fd16c17535
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan and an ML classifier indicating maliciousness. It contains numerous embedded URLs and is described as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8456

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://nomylo.ru/uplcv?utm_term=how+to+save+only+part+of+an+excel+spreadsheet+as+pdf PDF link annotation
    • http://uniradioweb.info/userfiles/file/89943085892.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/71de2beee8cf42efc66609631f2f084f/24439764720.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16149304659d37---tewomirawove.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/xupibowodaxusafabesakebi.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/64682076073.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/gobupeb.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/15155989283.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/63961473277.pdfIn PDF document text
    • https://khanikango.in/file/vibegufezikizebipadixegum.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/mowiwolitirikofi.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/33151921758.pdfIn PDF document text
    • http://alefart.ru/admin/ckfinder/userfiles/files/mafixutosexisuki.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/nusudusikasodekawebu.pdfIn PDF document text
    • https://tomaszbizon.pl/web/uploads/files/vulijafofuvad.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/55941553727.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/jexuwevejikiba.pdfIn PDF document text
    • http://ippon.lv/uploads/File/jesamawones.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/gukazanelila.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/9637226229.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/2367650860.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/8165540578.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/41669272661.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/fimenukipo.pdfIn PDF document text
    • http://altera.ukrstroyka.com/content/xuploadimages/file/pemuvozivow.pdfIn PDF document text
    • http://risme.vn/files/rubugivosasolarebazuru.pdfIn PDF document text

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