Malicious PDF — malware analysis report

Static analysis result for SHA-256 40801a0c9f04230f…

MALICIOUS

PDF

62.6 KB Created: 2021-10-12 13:24:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 573ba2265ac51521fe061f218bc096ca SHA-1: 0003963ec7bf3fea426c8c3634c05522c4e52011 SHA-256: 40801a0c9f04230f2b0e7bbdc671002119f20ba2fa4d26275e618318d52c1411
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also exhibits characteristics of a link farm, with a high number of external URIs pointing to various domains, suggesting a phishing or redirection attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7375

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://turismopontevedra.com/ckfinder/userfiles/files/76629791210.pdf In PDF document text
    • http://budaikepkeret.hu/uploads/file/bavirane.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/93782894908.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021100803003513.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/90695036027.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/75321346892.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/niwezumifarajusibe.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/73933720207.pdfIn PDF document text
    • http://dieukhactransam.com/uploads/files/kesetibiwurebij.pdfIn PDF document text
    • http://covina.crazyrockinsushi.com/uploads/files/81784937119.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/mupusixitewirub.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c017ccaa6e---wizoraxezurabez.pdfIn PDF document text
    • https://vleek.com/uploads/files/81944223216.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/31605238091.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/93285244453.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/6150196127.pdfIn PDF document text
    • https://spyboarcams.com/files/62445660011.pdfIn PDF document text
    • http://cityfate.com/files/files/73863896552.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/dutesoluvijonojup.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/wemamerasadalabisuto.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/xigejolabododorow.pdfIn PDF document text
    • http://imi.vc/upload/files/40431560066.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/naxafimoxupul.pdfIn PDF document text
    • https://noglehoma.com/ckeditor/files/files/14527043894.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/D9plVHj2VOU/uplcv?utm_term=tsx+top+moversPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB95D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d16f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16F 16944 bytes
SHA-256: efb2fcc6251838475e599377d0c5433de0f199bedfb554bff71fe99e23a7eb70

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