Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca6f70cf31bd5c0d…

MALICIOUS

PDF

77.2 KB Created: 2021-07-18 00:35:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a82810a84154945ae8132908960f26ae SHA-1: c9c494e6b12baba02b900d0db248d5fccc861536 SHA-256: ca6f70cf31bd5c0d952dd2757f443f4cdea64f551dd200a86f6e5f6550663bd9
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 a potential phishing or malware distribution vector. The wkhtmltopdf authoring application indicates the PDF was likely generated from web content, which could be used to disguise malicious links or content.

Machine Learning

  • Nyx PDF Classifier clean score 0.2489

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/sq/ugae/~3/gPkW7oTCsL0/square?utm_term=10+cups+of+water+in+liters
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e94a6bb9b95949b65ffd5b/1625901675665/nujosepozasorapuditu.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60efd02208697753172d368b/1626329122730/mowepefug.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_off0000caaf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAF 16792 bytes
font_01_sfnt_off0000e2c1.bin
aa8aa36af314974a3552fa3816da4b43eb5a70e54a3354b7a8db770e40711e61		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C1 16896 bytes
font_02_sfnt_off00010ec8.bin
b1460eb6a1cddbb272bccfb0adb0cac395ce5b0a025d6c2d87c88ab07e0fe009		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC8 10736 bytes

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