Malicious PDF — malware analysis report

Static analysis result for SHA-256 7273478182966231…

MALICIOUS

PDF

60.9 KB Created: 2020-12-26 14:40:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7afc2ec1b95019bb6446db5a8be63687 SHA-1: d25d14f8893031a4dd9b776868fd3cf8ffb12d7d SHA-256: 727347818296623129b2cc2b1c58f910312bb1202c81bd5833874e37918795d3
254 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a heuristic firing for a malicious redirector link pointing to 'https://cctraff.ru/123?utm_term=fruit+of+the+spirit+song+chords', and another for a link farm. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document prompts the user to install a browser extension or update, a common social-engineering tactic. ClamAV also detected the file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0'. The presence of embedded URLs and the overall structure suggest this PDF is designed to lead users to malicious sites or prompt them to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://cctraff.ru/123?utm_term=fruit+of+the+spirit+song+chords
    • https://static.s123-cdn-static.com/uploads/4467927/normal_5fcdfcc74d799.pdf
    • https://fegikunula.weebly.com/uploads/1/3/4/4/134482285/d1b044a.pdf
    • https://xizogezoki.weebly.com/uploads/1/3/4/7/134717510/bedoxajukukemuviti.pdf
    • https://diwijavel.weebly.com/uploads/1/3/4/6/134691177/pifuzomaxewomifono.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gixawetopoli/gukuvuselixizinokuko.pdf
    • https://s3.amazonaws.com/satulibaren/10350853528.pdf
    • https://s3.amazonaws.com/bisiku/bipibidokuwesuxatamele.pdf
    • https://s3.amazonaws.com/kofabube/42249749594.pdf
    • https://s3.amazonaws.com/kikunojulejuj/contemporary_society_issues_def.pdf
    • https://s3.amazonaws.com/bitizopovopaso/oshkosh_west_high_school_wi_shooting.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b33e.bin
fdcbfbe0f841fe001d668e934993d32159df616988b9a7005e4245cb4887a68f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB33E 5132 bytes
font_01_sfnt_off0000c4bd.bin
f10b473e55b27fb0e9ed661001bb641daf8e92910776b6a24508c37899d9b1c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4BD 10112 bytes

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