Malicious PDF — malware analysis report

Static analysis result for SHA-256 042592456e26483e…

MALICIOUS

PDF

62.3 KB Created: 2021-09-09 20:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7a0ec8d24d8d8602df13fdb796aa7917 SHA-1: 66c72888659054c7d737534d2153e44366b3c821 SHA-256: 042592456e26483e9807bd75f2e2a9cf7908e69cf16b0c063da4be6e4ee1a2ac
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. The document body is heavily obfuscated, but the presence of external URIs and the link farm heuristic suggest a phishing or SEO manipulation attempt. No scripts were extracted, but the PDF structure itself likely facilitates the redirection to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7247

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://ku4ysk-9lgp4y.com/contents/files/gimemopagenijurufepit.pdf In PDF document text
    • https://olterus.net/contents/files/20235057952.pdfIn PDF document text
    • https://tempegaring.com/contents/files/luwokavepaziduxevas.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612edd138bd12---80669116085.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/56354523329.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/zaruza.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/suvugoxesudawugaboleviw.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/74878117467.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/77716828085.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/lufozafedikikodixezibiwe.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/luposaj.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/kakunimej.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/87896866471.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/xefimururatutexapomegem.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/38103456804.pdfIn PDF document text
    • http://kasargod.net/uploads/file/fepoferezorif.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/lipobeweziparowi.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/puletenokevosefez.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16139d9c085394---89713308741.pdfIn PDF document text
    • http://techbis.pl/files/file/foleliguvakalujodipusu.pdfIn PDF document text
    • http://kietminhrivet.com/upload/files/bosiverizedetemovi.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/58700956105.pdfIn PDF document text
    • https://andana.us/files/files/buzejeromewudotifodufifoj.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/93226181667.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=god+of+war+for+android+freePDF 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_off0000dbb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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