Malicious PDF — malware analysis report

Static analysis result for SHA-256 37c3fbfb66b6cfbe…

MALICIOUS

PDF

74.4 KB Created: 2021-07-19 06:04:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: af6201cb3b2029d71a8e00c94abf8fdc SHA-1: d40a41b22c7985fbcf1e1065b7fa1b83a72c6ad5 SHA-256: 37c3fbfb66b6cfbe83e1df0489cb3817e031c4d385ccaeb0e1f819b883f563db
66 Risk Score

Malware Insights

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

The file was detected by ClamAV as a phishing trojan, indicating malicious intent. The presence of embedded URLs suggests a mechanism for delivering further malicious content or redirecting users to phishing sites. The PDF_URI heuristic firing confirms the presence of external URIs within the document.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2592

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/razvivatel/yapz/~3/gOBB6uaVNRA/square?utm_term=principle+of+complexometric+titration
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e965d1e6a58043b69387e6/1625908689130/gupidi.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f4df49c4d0d61e674a59c4/1626660681807/kuwojagi.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_off0000c1af.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC1AF 16792 bytes
font_01_sfnt_off0000d9c6.bin
63329c64caaac308c34a7923878739d7787176d1851da7fe84631563b557ee9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C6 10576 bytes
font_02_sfnt_off0000f1dc.bin
5fd8569d9585ab540c77ea7542e5cf342c9b521bdab8d49e68d32db88990ddab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DC 16852 bytes

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