Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf0cd3551f99b915…

MALICIOUS

PDF

119.0 KB Created: 2021-07-12 21:23:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 704777ce5ce08925b2db205f31378fb6 SHA-1: 634bd8b93c154d6f9b5b91c9bf71c698dc49a009 SHA-256: bf0cd3551f99b915a6c5b28ecf001a2b4174e81b610185b99d188f140f112f64
66 Risk Score

Malware Insights

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

The ClamAV heuristic identified this PDF as a phishing trojan. The presence of embedded URLs, some of which are associated with legitimate content but others are potentially part of a malicious chain, suggests an attempt to lure the user into downloading a secondary payload or visiting a malicious site. The file's structure and the detection name indicate exploitation of PDF vulnerabilities to execute code.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4745

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/sq/ugae/~3/r_nBws6J8g8/square?utm_term=introduction+to+marketing+strategy+pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e91bcd27127e680415bf68/1625889741079/relajevusefizoru.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e935168ce0e10532d35057/1625896214845/defaulter_meaning_in_english.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e85d9e70e7c20ba637ce86/1625841054507/how_long_should_you_keep_cooked_rice_in_the_fridge.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e923db854c1d3b34870ac6/1625891803997/zejizejigom.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_off000170f7.bin
6c1766465944008f45e8ee2b37c4d7c13eca882d91249609ef07b9ae9cc98c13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x170F7 17232 bytes
font_01_sfnt_off00019e17.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19E17 16792 bytes
font_02_sfnt_off0001b62e.bin
888e52d5fe9380ec0a606a13a0d2771a09b884e0bc43fb33fb7756b3fbc1ba08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B62E 11176 bytes

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