Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a12e50eb3baa421…

MALICIOUS

PDF

79.0 KB Created: 2021-09-21 03:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: be7ba7f4ae1b74f1b675e3af71041434 SHA-1: f34d1cecdc262df5847ee9c48414557258cf0b09 SHA-256: 8a12e50eb3baa42146039720cf30c271e310a3c8e91c84547275b6b9955c20af
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and a heuristic identified it as a link farm. ClamAV detection and ML classification confirm its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an intent to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7074

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://vilus.cz/userfiles/file/robuzuj.pdf In PDF document text
    • https://petala.gr/userfiles/file/kagisipugonetoku.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/70927068376.pdfIn PDF document text
    • http://whatdwellswithin.com/file/86307057924.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/xiwor.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/5528258757.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/xesenoweluxeru.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/25728412615.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137909fab328---deketununujigijixote.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/sijusazara.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/24482172068.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/kevijikufez.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/gesiti.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/sopumipefomezen.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/67799890425.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613396379e536---71374950104.pdfIn PDF document text
    • https://tavio.ru/files/file/ruvajo.pdfIn PDF document text
    • https://grandegroup.net/files/nirozumurabimofagagabaw.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/pejuwixigeluvarewawa.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/mejazolep.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/wipigibibowelemiwabo.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/paraf.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/84725246692.pdfIn PDF document text
    • http://domario.ru/userfiles/file/kibowimerulefo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=something+that+starts+with+gPDF 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_off0000ff9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9D 17320 bytes
SHA-256: 6236dd5cc4adbf0be84df32ea81fed6bc2fd8c8767de1c2db08702f279e7d711

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