Malicious PDF — malware analysis report

Static analysis result for SHA-256 86f356ed48e36b3f…

MALICIOUS

PDF

76.2 KB Created: 2021-07-19 01:50:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1ef57f900a3a38b1ed30d763cca83f9d SHA-1: 6af87aa0750bb4aef54f0558363ff6303c293018 SHA-256: 86f356ed48e36b3f27b38be28e58d505082b22f1339c11f7b101dd7a493ed89b
96 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 and an ML classifier, indicating malicious intent. The presence of embedded URLs suggests it may be used to lure users to malicious sites or download further payloads. The file's structure and detection by ClamAV as 'Pdf.Phishing.Trojan' point towards a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8791

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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://feedproxy.google.com/~r/razvivatel/yapz/~3/1LSSs5qy-i4/square?utm_term=does+motrin+have+aspirin+in+it+yahoo+answers
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f45a03d9389f5e80980530/1626626564067/94618010874.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f4ae011d350707422e004e/1626648065759/71903069018.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60efdd41177a4e2836d203ca/1626332481608/tiwipujinutizavotekinarin.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e90f1e83ae0c490238525b/1625886494792/jexojad.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f0216349582827e2ff3505/1626349923683/does_hot_cocoa_have_caffeine_in_it.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9b6.bin
ea702703dae0f74c76c42b93a9a41c959580e7fc63c4b280ab7c11f3314ff011		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B6 16328 bytes
font_01_sfnt_off0000f40e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF40E 16792 bytes
font_02_sfnt_off00010c25.bin
758f09edbe828814157802ce708c67b85d90e92eed90b2919421eb18b7292349		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C25 10736 bytes

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