Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e7b55d5c7de2415…

MALICIOUS

PDF

67.8 KB Created: 2021-09-18 06:54:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ef6097d14b15c7424a4eee5ce9079ffd SHA-1: 8ed2cce29e0669ef149d476de22b0017d1164cd6 SHA-256: 4e7b55d5c7de241542f98e7b541ae70dd71c717a80d1645aec5f560e56d61898
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links to potentially disposable domains, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection further support its malicious nature, likely serving as a lure to external sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5231

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://mayersoffice.com/userfiles/file/musabalojakaz.pdf
    • http://finance-bulldog.cz/UserFiles/File/38329405444.pdf
    • http://daiichibus.vn/uploads/news_file/13937175835.pdf
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/55373974901.pdf
    • https://hophamthaibinh.com/upload/files/31497090706.pdf
    • https://bocion.com/ckfinder/userfiles/files/zugumebavafevofijagewavev.pdf
    • https://xrtradingfeedback.com/cmsimages/file/zedidij.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140cdf7014fe---85809134474.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/5ptor163hlharc077grqtu3er5/1010423604.pdf
    • https://vivekanandbawwa.com/userfiles/file/gekitifi.pdf
    • https://memorybg.net/app/templates/js/ckfinder/userfiles/files/legetukisuxuze.pdf
    • http://kaitosushisb.com/uploads/files/64568451163.pdf
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/tulukazube.pdf
    • https://clinicamanila.com/ckfinder/userfiles/files/sixupemegaretinetu.pdf
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/68201822995.pdf
    • http://londonjip.com/userData/board/file/monila.pdf
    • http://homestationrealty.com/userfiles/files/nopazexejubiriputit.pdf
    • https://takipcisec.com/calisma2/files/uploads/2724060476.pdf
    • http://jedwines.com/cmsCart/upload/file/jugubusetos.pdf
    • https://powermailer.in/userfiles/file/60435619467.pdf
    • http://leguido.net/files/gidemibabanasata.pdf
    • http://vitalenzyme.com/uploads/fckupload/file/valufuwul.pdf
    • http://webinaris.biz/ckfinder/userfiles/publics/files/14958777210.pdf
    • https://rkdestate.com/userfiles/file/84580518713.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=redmi+note+9s+pro+price+in+bangladesh
    • 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_off0000cd0c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0C 16792 bytes
font_01_sfnt_off0000e523.bin
2a29e93ed3cdb73b0c50c131ad74736bece710b7aecfd5f37fb2bc9d7c723374		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE523 11316 bytes

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