Malicious PDF — malware analysis report

Static analysis result for SHA-256 591e46b51ecefadf…

MALICIOUS

PDF

55.4 KB Created: 2021-09-28 05:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3a56fcab6b3adad6a185d73419663ea2 SHA-1: 54df104f266ba23bec008e3e482e651188411fd9 SHA-256: 591e46b51ecefadf35d8d8399f676f4a54ef259fcefd60c4af7ab050bb6b012a
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least one pointing to a suspicious domain ('krisoc.ru') and another being part of a link farm heuristic. The presence of these links suggests the document is designed to redirect users to potentially harmful websites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7984

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://krisoc.ru/uplcv?utm_term=criminal+minds+script+season+1 PDF link annotation
    • http://scandinavia-ex.com/images/blog/file/lojuwolasovajijolugun.pdfIn PDF document text
    • http://xn--38-mlcqjbufcz6h.xn--p1ai/userfiles/file/mebuxo.pdfIn PDF document text
    • http://xn----7sbndn5at.xn--p1ai/uploads/files/ragapenalunibazovirakodu.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/lowozinobeposexuk.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/87184005095.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/36551050071.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/divol.pdfIn PDF document text
    • http://abwessex.com/uploads/files/27500084574.pdfIn PDF document text
    • https://premium-house.uz/images/file/takibemeremixazatawu.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/beninirazo.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/fofegoxasejiwobeje.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/wejedarubij.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/0bfe854c23be90e4939802b76061bff7/13500516901.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/meseka.pdfIn PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/92543197432.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/12803343935.pdfIn PDF document text
    • http://putzlappenborner.at/editor_up/32220281565.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/tawiwiwosadefazumegaj.pdfIn PDF document text
    • https://wittnebel.dk/file/kigekibanexiporusow.pdfIn PDF document text
    • https://pasarantogel.com/contents/files/rukoruxuluxarajir.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147e21df0b65---wedepelulukipalazo.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/muzupefuteg.pdfIn PDF document text
    • http://pro-group.ru/userfiles/file/fofomupikexedotijido.pdfIn PDF document text
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/sakifakolikewot.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/33995782576.pdfIn PDF document text
    • 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_off0000b18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB18C 15876 bytes
SHA-256: 725b1e475428341020a8ffd2bd8b3dd5db734c97b766c69c618d104f1d0d2a0c

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