Malicious PDF — malware analysis report

Static analysis result for SHA-256 0166b62a5a08a252…

MALICIOUS

PDF

109.0 KB Created: 2021-09-18 01:34:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: cee36a33753281f532c8f9fb83e7554f SHA-1: ca6fac65df4c4f744a71665c3309f861093b6850 SHA-256: 0166b62a5a08a2521ccbdf9b683ad35815a6664fddec3d1f47357e303f841b4b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content, likely involving spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://orderbestwings.com/uploads/files/timoxago.pdf In PDF document text
    • https://totalsewa.com/userfiles/file/90023488688.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/nabedo.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/62711097296.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/91325490640.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/48956657657.pdfIn PDF document text
    • http://idcla.net/upload/files/xapuzozuzusen.pdfIn PDF document text
    • https://rivieresoceanie.com/userfiles/file/nufivadekopexogukajudit.pdfIn PDF document text
    • https://parkettworld.com/upload/files/93815663986.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/1084978949.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81739598865.pdfIn PDF document text
    • https://brakos.it/file/6664581480.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/26752544399.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/23705204355.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/zimov.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/8915262181.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/5224gi9pomgmsaj1ah1jt5jmh0/30758846581.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/lexututixirow.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/9958970340.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vuvelebi.pdfIn PDF document text
    • http://africareview.in/userfiles/file/somab.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/72493157047.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/ralodasokiselevosip.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341158d355b---tomipigelekaxazimapimad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=fundamentals+of+digital+logic+with+vhdl+design+3rd+edition+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14317 11468 bytes
SHA-256: 595f92b3f3dcc11216186a6dfd7add0b87ebf6bb2367142b8ff732a864054f10
font_01_sfnt_off00015dea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000175fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175FC 18436 bytes
SHA-256: bfe053dd4756494d571fa703ecdf7044b0813f15a06decf19c2a0e5ac6f53f76