Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5c920312b1b9f82…

MALICIOUS

PDF

78.1 KB Created: 2021-07-14 00:18:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 10b8a783089096f3bb9e277b7f1772ae SHA-1: d3a96f0666140a42abf0972dedc929307a58d496 SHA-256: c5c920312b1b9f82d004d755eec589a8a2743e57a7a7868b36d5efc73cd5cd95
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan. The presence of embedded URLs, despite some being marked as benign, suggests an attempt to redirect the user to malicious content. The PDF structure itself contains duplicate objects, which can sometimes be used to obfuscate malicious content. No scripts were extracted, but the overall context points towards a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier clean score 0.1751

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/X6hrLWyzjlw/square?utm_term=write+right+paragraph+to+essay+1+pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e770e3a336ab736a1eca26/1625780451538/maybe_so_meaning.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_off0000d260.bin
0dd429878f7e7ec3ad5ebd463383898fe8a1b5c2c889baf02eab54f2c3253b58		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD260 10784 bytes
font_01_sfnt_off0000eb3b.bin
e27ae02e0ccc33d620c1d331197f815993c59a82a1fdc9b4d3f83a04de7ee827		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3B 15600 bytes
font_02_sfnt_off00011309.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11309 16792 bytes

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