Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6be682456c5d264…

MALICIOUS

PDF

61.4 KB Created: 2021-09-25 14:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f97d248a953865cc41c13d3494aa8699 SHA-1: 4fe5c47d3a775f9eb6d9eaec6aeaf1ecda807e2d SHA-256: f6be682456c5d26472d8edcf684361dba9553fb69ec63b114953c5017b45955f
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan. The presence of numerous embedded URLs, many pointing to disposable hosting and utilizing UTM parameters, strongly suggests a phishing or malware distribution campaign. The ML classifier also indicated a high probability of maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7892

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 https://irlanc.ru/uplcv?utm_term=ninja+moba+mod+apk PDF link annotation
    • https://alistairmills.com/ckfinder/userfiles/files/ronef.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/7540725726.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210910194851.pdfIn PDF document text
    • https://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/bekezufisenudokiwuwu.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/32852418891.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/71885505422.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021091918441_931091849.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/fazutiwozidenafef.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/wapekepalevuxi.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/55151597494.pdfIn PDF document text
    • http://divorcefinance.nl/uploads/file/xojugeso.pdfIn PDF document text
    • https://playworkspartnership.ca/sites/default/files/file/77409062697.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/21974634776.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2b7a069d8---vulatiw.pdfIn PDF document text
    • http://fmdscu.net/userfiles/file/sofakaso.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/63186514346.pdfIn PDF document text
    • http://luyutea.net/v15/Upload/file/2021916418542761.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/patufatiseloxo.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31613274728.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/21954308129.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/pomewevaxemoxajulef.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC68 10348 bytes
SHA-256: 3a21d1088709353c8275daecc467c018677ffc5d56daf4c95fd2eaab91fd114a