Malicious PDF — malware analysis report

Static analysis result for SHA-256 5db8c617d9e88292…

MALICIOUS

PDF

76.2 KB Created: 2021-09-17 06:09:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bda8d20ef8765ed9d23c561e88ae56e4 SHA-1: 72ac61a46d4c0ed442a12874d18caf5767ab52c5 SHA-256: 5db8c617d9e882927078c28f2868b55b830104e969ec1d6446325018671ef51e
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting, indicating a link farm designed for phishing or malware distribution. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The ML classifier also flagged it as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5732

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.
  • 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://hw-power.com/uploads/ckfiles/files/613dbb98f0b8b.pdf In PDF document text
    • http://studioingegneramato.com/userfiles/files/pidewuzegosavipi.pdfIn PDF document text
    • http://yukamifashion.com/upload/files/81490658173.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/88990862057.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/15412470411.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/bemaw.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/vovudoxijudepozegujare.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/49181563371.pdfIn PDF document text
    • https://giyimkent.formenemlak.com/upload/ckfinder/files/77286553099.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/32177103922.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/runusofuvubisoju.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/deruwomez.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/tusutejo.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/sasipovujanimaxube.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16135ba1975fe8---25037395959.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/muwis.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/69676739227.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/67222609457.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/90528530465.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/43372701921.pdfIn PDF document text
    • http://srtcivilnorth.com/ckeditor_file/files/tapuxedosakaperekabil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=kodi+download+android+apkPDF 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_off0000de4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF660 17656 bytes
SHA-256: 35ea49f3fa4e441bca1dec28574abe412ffea90d3640bc29e1da6acf717f714b

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