Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d8cc91378db71e4…

MALICIOUS

PDF

60.2 KB Created: 2021-09-30 19:13:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 876e5488d3ddde47f7bc3e69521b98c5 SHA-1: a0148d5f799acb8d497cfb4e38d3bdc6ff6a0429 SHA-256: 0d8cc91378db71e4772fe68e6366d141a2626cfad2b687089386fc71bce2d13d
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with many pointing to potentially malicious domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a deliberate attempt to create a large number of links on disposable hosting, a common tactic for phishing or distributing malware. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. While no scripts were explicitly extracted, the presence of external URIs and the link farm structure suggests the PDF is designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8282

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://sanagustin.cl/files/wuvinobi.pdf In PDF document text
    • http://tai-yang.tw/taiyang/upload/file/46653504413.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/76083766043.pdfIn PDF document text
    • http://signauction.net/userfiles/file/19666894496.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/xejudunapagufojagibajam.pdfIn PDF document text
    • https://cplastik.eu/data/cms/file/80959798303.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/filogel.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/rewavunopaferoxojije.pdfIn PDF document text
    • http://hawaiianhunareiki.it/file/60801783689.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/11841269397.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/98438751990.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210906_E41CC91664DFF0FF.pdfIn PDF document text
    • http://hebakotb.net/userfiles/file/pufozipolowigowinixixu.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/25808760160.pdfIn PDF document text
    • http://iberia-ex.com/images/blog/file/ruputuwa.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/bolut.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613647dfe88f5---tolodufumalixurowe.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/dolegukunupugebosuxu.pdfIn PDF document text
    • http://venkateshservices.com/uploads/85432887494.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/damonebemawisinefono.pdfIn PDF document text
    • http://plncse.hu/php_data/file/kijidilu.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210927_133402_7584.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/58934468802.pdfIn PDF document text
    • http://mayinluatudong.com/uploads/userfiles/file/38062854866.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+connect+android+phone+to+laptop+using+hdmi+cablePDF 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_off0000bebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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