Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a6738da42bdfe67…

MALICIOUS

PDF

73.4 KB Created: 2021-09-16 01:20:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1a990f932305a687580a9ee3dae93a33 SHA-1: 1fd9cff49a41af2397be59ec403ad7cc2493871c SHA-256: 3a6738da42bdfe679a459369b41be6206312b863ecdc39070bc30782d80b2162
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document is designed to host a large number of links on disposable domains, a common tactic for phishing or distributing further malware. The ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4179

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://krisoc.ru/uplcv?utm_term=minty+candy+axe+code
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/54282220725.pdf
    • https://kitapkapla.com/upload/ckfinder/files/69504855562.pdf
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/40139062233.pdf
    • http://teplolux72.ru/upload/file/40642100623.pdf
    • https://daquin-ferriere.fr/userfiles/file/junagixot.pdf
    • https://travellifeafrica.com/ci/userfiles/files/95240184479.pdf
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/retawuzafodija.pdf
    • http://worldplastsolution.com/ckfinder/userfiles/files/sipagokex.pdf
    • http://mskabel.cz/UserFiles/File/77328916280.pdf
    • http://www.jysunshine-hotel.com/up_files/file/44605919012.pdf
    • http://www.alex-vasilkov.ru/images/wisdom/file/zamizatilirelo.pdf
    • http://hiace-yoshikawa.com/js/upload/files/28064807937.pdf
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/tilap.pdf
    • https://www.sterlingsez.com/ckfinder/userfiles/files/digobe.pdf
    • https://home-consult.lu/userfiles/files/vexomam.pdf
    • http://eaupureinternational.com/userfiles/file/98212189189.pdf
    • http://ulv-fogger.ru/d/files/vupup.pdf
    • https://agmatbaa.com/upload/files/50034436672.pdf
    • http://kleinschadenexperte.de/userfiles/file/65525746033.pdf
    • https://borgopitti.it/userfiles/file/93923148392.pdf
    • https://johanbjerke.se/userfiles/file/40165627234.pdf
    • http://www.bash.cl/media/file/lamipofunetapopinul.pdf
    • http://koovappadyscb.com/ckfinder/userfiles/files/64319298331.pdf
    • http://househouse.it/userfiles/files/51419386783.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7a5.bin
b8bd2ee4ad857024fd02e80acf2b2e2af451b0da217f6cb00cc3d4559b6365ba
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A5 10256 bytes
font_01_sfnt_off0000eee5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE5 16792 bytes