Malicious PDF — malware analysis report

Static analysis result for SHA-256 b588da1ced18e785…

MALICIOUS

PDF

79.4 KB Created: 2021-07-21 14:31:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7e68a2cc2527375e22ea399c68f231d0 SHA-1: d8c2c42f88c0b1856550d7586f9a818489735b6c SHA-256: b588da1ced18e78529415b7663a465721d99da56cad156714c4fc0c3acbdd7f4
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with the signature 'Pdf.Phishing.Trojan'. It contains an embedded URL that, while currently flagged as benign, is presented in a context that suggests a phishing attempt. The PDF structure itself is unusual, with duplicate object bodies, and was generated by wkhtmltopdf, which can be abused to create malicious documents. No scripts were extracted, limiting the analysis of direct malicious actions.

Machine Learning

  • Nyx PDF Classifier clean score 0.1658

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=angel+numbers+meaning+chart
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f1fef37c06d275666cf552/1626472179602/primary_angiitis_of_the_central_nervous_system.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ee65dbf6c772366d309513/1626236379882/67556017616.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_off0000d3ef.bin
1357f28f7bd6c0e75a7fdfa9927489162dd2b5e407ee21b863e6dcf403a9db0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EF 16672 bytes
font_01_sfnt_off0000ff63.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF63 16792 bytes
font_02_sfnt_off0001177a.bin
cf2e32836f3fdc5f224e204c28e450350ba31f5e43f21472360d06a5df116d2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1177A 10776 bytes

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