Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5f6c446a8d64dd0…

MALICIOUS

PDF

82.1 KB Created: 2021-07-13 20:37:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 72fa92de7c6586e31b8afcd01fe65405 SHA-1: 2fef71a3d75485736b483647f9d0cc84854db976 SHA-256: a5f6c446a8d64dd0481973d00be988ddcbfeac7e77bbca276bce9375f8b1d73a
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a signature indicating it is a phishing trojan. While no executable scripts were extracted, the PDF contains embedded URLs, one of which is flagged as potentially malicious. The document body is heavily obfuscated, preventing a clear understanding of its content, but the presence of external URIs and the ClamAV detection strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier clean score 0.0894

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/EjZ5HCEZs_A/square?utm_term=construal+definition+psychology
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ec7f31ad1bf7105ccb71b4/1626111793232/wivetivo.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e937fd2a6f785f58351c6a/1625896957365/insert_pages_to_word.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cccf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCCF 16792 bytes
font_01_sfnt_off0000e4e1.bin
3edef2e6326630b2540944882de5b41cbcb1b14ee547c2ff2e2f74d96014b414		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E1 19736 bytes
font_02_sfnt_off00011613.bin
8330cfe27cd190e0ebb02d506a349c2905a42660d3b4840f43a50806f82607a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11613 11144 bytes
font_03_sfnt_off00012fdd.bin
dd01052df11c6906727de85c96428d2e4641cc572fd79c06cd91f0978435c80f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FDD 2388 bytes

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