Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9c508fbc5aece46…

MALICIOUS

PDF

67.9 KB Created: 2021-09-17 23:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7f198e8263217bee0b612238067f2c57 SHA-1: b9e73513e2b6819c52b68a25f048426bfebb4bd0 SHA-256: c9c508fbc5aece4613a50586bb5c6dd025bf406a3d73f3f99b39b31de4b94219
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan-d2568dad23a94d95'. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier also strongly indicated maliciousness. The primary attack pattern appears to be SEO manipulation or hosting malicious content via a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9130

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 http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/61328464792.pdf
    • http://ketphatthinh.vn/upload/files/78402937334.pdf
    • http://riph.pl/userfiles/file/62217714234.pdf
    • http://skinct.com/upload_file/file/Fl202109100145425934.pdf
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/71415306181.pdf
    • https://gymlesgeants.com/upload/editor/file/69908184029.pdf
    • http://alhambra.kopanramen.com/uploads/files/99939771996.pdf
    • http://newgatedesign.com/Images_upload/files/xiretavigezeloro.pdf
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/bobulos.pdf
    • https://lescourailleurs.com/upload/editor/file/74579264339.pdf
    • https://sandp-engineering.com/ckfinder/userfiles/files/29514599554.pdf
    • http://design-klasse.de/ckfinder/userfiles/files/kituwuvotufusem.pdf
    • http://ediliziaunoaventi.com/userfiles/files/mizimosifewaguwefapewajew.pdf
    • https://www.aukuras.org/ckfinder/userfiles/files/xulabupikujelareker.pdf
    • https://ctcitsupport.com/media/files/gamomur.pdf
    • http://audidalys.lt/ckfinder/userfiles/files/xotub.pdf
    • https://amthanhanhsangchinhhang.vn/upload/files/xanupimozomowa.pdf
    • https://travellifeafrica.com/ci/userfiles/files/49996659921.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7075680a2---4748982064.pdf
    • http://www.neoneofitou.com/ckfinder/userfiles/files/51110570734.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/161321d32e4e79---pobesotujekamaga.pdf
    • http://www.chp.pl/ckfinder/userfiles/files/vowazaxurowiza.pdf
    • http://wamer.org/userfiles/file/wajozamapasivobenurabevot.pdf
    • http://mjacz.cz/soubory/files/zuvakigerajereliboku.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=free+robux+promo+codes+no+verification
    • 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_off0000e2d3.bin
244081b26ec95632b98a604e5bf580e1a04c37c60aaa35748049c9d71d874e22
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D3 11120 bytes