Malicious PDF — malware analysis report

Static analysis result for SHA-256 698e5c35cf40081f…

MALICIOUS

PDF

73.9 KB Created: 2021-07-17 12:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3670834bf2e1531d08abb99a46b68444 SHA-1: c5b1934f42bbbd734b7ab661f128a36d29f6b74d SHA-256: 698e5c35cf40081f5b3705678c40d84ebae771f596c7bed01f81844fb3d375d7
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a phishing and trojan detection. It contains an embedded URL that, while currently flagged as benign, is presented in a way that suggests a phishing lure for a document. The PDF structure and embedded URI heuristic indicate an attempt to redirect the user to an external resource, likely for malicious purposes.

Machine Learning

  • Nyx PDF Classifier clean score 0.1751

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=laboratory+experiments+in+microbiology+11th+edition+pdf+free
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f234e7d52b82025f9e407e/1626485991551/0.07_m3_to_kg.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_off0000bc64.bin
c62f3cefb0799e2c996bb4d748f3e84512ee6af233d4253304b3ae4fcf7fdab2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC64 17052 bytes
font_01_sfnt_off0000e920.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE920 16792 bytes
font_02_sfnt_off00010137.bin
7cb75bf0e1c441235f87f187d900a778c2920937c815eae84d7d7dce185d0f21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10137 11432 bytes

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