Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb7a3a5ae9355d26…

MALICIOUS

PDF

94.0 KB Created: 2021-07-15 18:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5cb7d09893b21b0d1c9f8e7291b963ae SHA-1: 51783e54e9c7e9d566c596cd9b3e7fa37b5e42af SHA-256: cb7a3a5ae9355d26754313fa049d3dd4f226cedfa0f5bbe48cfd1b08988b9e23
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as a phishing trojan and ML classifiers indicated maliciousness. The 'SE_INVOICE_LURE' heuristic suggests the document's content is designed to mimic an invoice or payment request. While the embedded URLs were confirmed benign, the PDF_URI heuristic identified a potentially malicious external URI that could be used to deliver a payload or redirect to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6187

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/S-4CHg4Qmwo/square?utm_term=finacle+10+commands
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60efd1e7177a4e2836d1a631/1626329575452/74573819732.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ee90280b33b63bb8ca697a/1626247208822/chemistry_regents_answers_explained.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ee54411cf0e6777f30044f/1626231873475/jpg_to_multiple_pages.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_off00011261.bin
2373789b9e03263c573cc697bf8c3ae13b630f639903ae25b0d0db820e2e64e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11261 10484 bytes
font_01_sfnt_off00012a29.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A29 16792 bytes
font_02_sfnt_off0001423b.bin
6a00813f8d25f3f29cf96456226ea7989c4371864d78bf7de3921513a4569bde		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1423B 16404 bytes

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