Malicious PDF — malware analysis report

Static analysis result for SHA-256 738fa14947af51c7…

MALICIOUS

PDF

52.6 KB Created: 2021-09-19 00:08:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1a0dae851832ecc37353c1c7d222a9bb SHA-1: a070f16cfd999f5595d7b8f745b5f5e75b3fdbfd SHA-256: 738fa14947af51c78edfd44fa829660701bc0d331785f4b567beabffcb6241ff
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating it is designed to redirect users to malicious websites. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and ML_NYX_PDF_MALICIOUS firings, along with the ClamAV detection, confirm its malicious nature. The primary attack vector appears to be a phishing lure disguised as an employment IQ test.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6056

Heuristics 5

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=iq+test+for+employment+with+answers+pdf PDF link annotation
    • http://aftp.bg/userfiles/file/tusenid.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/lupimogogewokelixebigamo.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/bovewiradesa.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/30479196156.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/gozikofefevizegu.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/xisimilewajebowutenekotib.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/19160254725.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/661d2589730f41ab107b05cf6728a687/belikexi.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/kutekarasoburivowa.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/1337847864.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/gsn6it1sr872bl2e0ajdq1df16/kakigulezu.pdfIn PDF document text

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