Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a0cf20b84acbf87…

MALICIOUS

PDF

64.0 KB Created: 2021-09-20 03:47:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 97dfa08b6d71e539b48c3e68fb73e689 SHA-1: 83cc4d67a4705223dba0d425e7e5e72d93124a28 SHA-256: 5a0cf20b84acbf87bb79906e326fabbc0ebe15b85f4589f5c47ba50d18eb81df
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. While the document body is heavily obfuscated, the presence of many links suggests an attempt to lure users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6298

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://asqcert.net/files/files/tujumakebaxaburutede.pdf
    • http://www.web-globus.de/ckfinder/userfiles/files/wuxanakupafumokug.pdf
    • http://terredellamagnagrecia.com/userfiles/files/jexepupupupikive.pdf
    • https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/muredosejujoj.pdf
    • http://allineers.morefriendship.com/upload/files/10535468175.pdf
    • http://residenceraffaellotorino.com/userfiles/files/xisokexogewoge.pdf
    • http://goodlack.cz/userfiles/file/xibiwerulunutinibenujiva.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7b0d84e23---limusozenumorawulawiwukeb.pdf
    • http://the-bom.kr/upfile/files/27726548674.pdf
    • http://tidomusica.com/uploads/files/202109151512006686.pdf
    • http://kaiyudachem.com/filespath/files/20210910181141.pdf
    • http://greenlivinggarden.com/htdocs/UserFiles/file/roxupin.pdf
    • http://ventensis.lt/public/ckfinder/userfiles/files/7451833506.pdf
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/jixuvadebu.pdf
    • http://orderkai.com/uploads/files/musiforawafebexame.pdf
    • http://vinhthuan.asia/upload/files/wopesewovak.pdf
    • http://tieuhocsongphuong.hoaiduc.edu.vn/ckfinder/userfiles/files/kitexageg.pdf
    • http://michael-dhom.com/webseiten/file/dofumevopitasejalab.pdf
    • http://teamhead.net/userfiles/file/83724200601.pdf
    • https://armenia4d.com/contents/files/65307331405.pdf
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401c3e04131---11617748143.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=google+account+manager+7.0+apk+bypass
    • https://tes-sys.com/uploads/ckfinder/files/20210903/16306068039757.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_off0000c757.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC757 16792 bytes
font_01_sfnt_off0000df6e.bin
5d8c4363ee9f08295ccb0674418d1216849c14113ef2294aeca9b53c5b4d5525
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6E 11348 bytes