Malicious PDF — malware analysis report

Static analysis result for SHA-256 59c92a1a0fc45bd7…

MALICIOUS

PDF

76.7 KB Created: 2021-07-13 17:18:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7c6367ab77a58d4acb07f28952671295 SHA-1: f90a7b17509c408bc20ddac56597c590d420c4bb SHA-256: 59c92a1a0fc45bd761c0291848553ad62d15c44167bb70b71ab876aa7a1ea8da
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded URLs and the PDF structure suggest it is designed to lure users into clicking malicious links or downloading further payloads. While no scripts were explicitly extracted, the PDF format often utilizes JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7390

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/uzX87CUNjRg/square?utm_term=possible+values+of+x+calculator
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec83a0d0153e73bf8bd5ef/1626112928915/a_going_concern.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e7b4dd28bb5f4f51614a76/1625797853253/beamer_style_powerpoint_template.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ed8ebabde79631d34109c7/1626181306706/jemanopagakuboxaxukatu.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ed95e6ac23c31e62fc9293/1626183142269/indian_air_force_doctrine_download.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_off0000cac7.bin
cb8786a0ece9b6cd7c3a52e69deb143f00cbba5f02d2e7cc1078b536c824f521		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC7 10632 bytes
font_01_sfnt_off0000e356.bin
14f578b904ede318b800809b605f71c4d308d1cb887bc77631a9a3aff4e9131f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE356 16796 bytes
font_02_sfnt_off00010f13.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F13 16792 bytes

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