Malicious PDF — malware analysis report

Static analysis result for SHA-256 c67b4980070cf695…

MALICIOUS

PDF

77.4 KB Created: 2021-07-13 09:44:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9f65f466fc31428238a76bf8f1845a5e SHA-1: 9755d0054d33f3c58c9aed16ee2c7d3a96379905 SHA-256: c67b4980070cf69523c8fb283ed0c94ee81268612f4aee7f5cec239b0b9db21c
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 heuristics related to external URIs and download buttons suggest the PDF is designed to lure users into downloading a secondary payload. No scripts were extracted, but the overall structure and detection results point to a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7604

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/-MXWpcYQ7kA/square?utm_term=converting+a+powerpoint+to+pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ecdb1a6b40a9602c8f306a/1626135322693/jesodibufebafolujir.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ed070fff6d86145b9b8967/1626146575725/green_field_apartment.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ecd2cf08293e04a48bfe55/1626133199921/how_will_you_describe_the_persona_in_the_poem.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_off0000cf84.bin
bb7a8ef320cb06974d13d201546d42c6048e802a2fee75ffcffc42edd4056a92		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF84 16260 bytes
font_01_sfnt_off0000f9cb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CB 16792 bytes
font_02_sfnt_off000111e2.bin
e166922feb519181ee7850b14cae90b670d8945e1527217560c719e29a630a2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111E2 10644 bytes

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