Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb881672719837aa…

MALICIOUS

PDF

62.5 KB Created: 2021-09-13 05:57:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8c9ade3dc0df5f0334f26e994f8929d9 SHA-1: 94f1cd3379e032886571e333b233bd620fb37d06 SHA-256: fb881672719837aad035168497699b1e102ae8faa4503fcd183318697a4d9db3
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains a large number of embedded URLs, many pointing to potentially disposable domains, suggesting a link farm or phishing campaign. The presence of external URIs and the overall structure strongly suggest the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9009

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://autoprofi.ua/userfiles/file/ludawesijununozoruf.pdf
    • http://9meclinic.com/ckfinder/userfiles/files/87805190030.pdf
    • http://alnoorcity.com/userfiles/file/winidewawoxojipa.pdf
    • http://bkht.vn/userfiles/file/xejibisof.pdf
    • https://vico-domrep.com/ckfinder/userfiles/files/31958581518.pdf
    • https://shidoremicrosys.com/media/52536349670.pdf
    • https://visualmotion.nl/uploads/file/62843958493.pdf
    • https://marblobathware.com/app/webroot/img/files/muvulu.pdf
    • http://koszyczarek.pl/userfiles/file/96791701565.pdf
    • http://chornakorn-packing.com/ckfinder/userfiles/files/54346846405.pdf
    • http://busankid.com/webfiles/board/file///49438452763.pdf
    • http://vizugy.hu/uploads/files/40363873493.pdf
    • http://everintelconsulting.com/upload/file/202109020302082906.pdf
    • http://mp-hd.de/data/aktualnosci_imgs/file/12944779884.pdf
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/29342843452.pdf
    • http://chemonova.com/FCKeditor/file/53833757810.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613da458e8ae6---veruzefokasexekozidi.pdf
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/59803278324.pdf
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/vasowu.pdf
    • http://balcimimarlik.com/resimler/files/42964712760.pdf
    • https://alkathirilaw.com/userfiles/files/todosizezug.pdf
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/83290596243.pdf
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/90308999552.pdf
    • https://cyberbirddog.com/userfiles/files/sibotajato.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=kinemaster+software+for+pc+windows+7+free+download
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2d5.bin
519145d13272045c8f252dfc54dfb7840211321890a61ac3a0ce32eefd5eb6fc
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D5 10908 bytes