Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3fdf50bfe3e6eca…

MALICIOUS

PDF

74.8 KB Created: 2021-07-13 21:34:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c74451d8d02a49d9c8a39a58f83529ff SHA-1: 66684ac1a96e21afa992399232e4de2f140f9dde SHA-256: a3fdf50bfe3e6ecac4def888e2e3e2171c78bd3871caec740e48f883041a5bc0
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a phishing trojan by ClamAV. It contains embedded URLs, one of which points to a PDF hosted on squarespace.com, suggesting a lure to a malicious document. While no scripts were explicitly extracted, the PDF structure and embedded URIs indicate a phishing attempt, likely delivered as a spearphishing attachment.

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/~3/7R6buoffwiA/square?utm_term=difference+between+linking+verb+and+helping+verb
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e8b46a299fea38d986cb02/1625863274297/gedumonu.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_off0000c417.bin
cf1e989a518ef5ece0fb4ca993b442c866128a57196f6cedc070b771244c1003		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC417 10996 bytes
font_01_sfnt_off0000dd38.bin
a20d2100811747b2d389698674fcc5180d50b490d1df83032550f63bd3a38004		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD38 16276 bytes
font_02_sfnt_off00010719.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10719 16792 bytes

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