Malicious PDF — malware analysis report

Static analysis result for SHA-256 1556812b81b234ae…

MALICIOUS

PDF

79.7 KB Created: 2021-07-20 00:06:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8ccc5a8a2eeacff63ced5448549b3cd5 SHA-1: caa9f0e0472ea9aebeaa26c05e0fe1880ae8104e SHA-256: 1556812b81b234ae6919f3e283da6da027c0885740798410f3918f845fbaebe4
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ClamAV heuristic identified this PDF as 'Pdf.Phishing.Trojan'. The presence of embedded URLs, one of which is directly referenced in the PDF structure, suggests a phishing or redirection attempt. Although no scripts were explicitly extracted, the PDF structure and the heuristic indicate malicious intent, likely to lead the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier clean score 0.1726

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/UZrB20b2Dcg/square?utm_term=the+resurrection+of+joan+ashby
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f5a4c9dcd9b50ede69a07d/1626711241541/permutations_and_combinations_worksheet_with_answers_doc.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f5e8067f1f2a52af75f7d2/1626728454775/free_printable_letter_a_worksheets_for_preschoolers.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_off0000d20e.bin
37ebe5b905b525cb9b70c23a7d519eb4f1751e775b9b8ab29c910c1a7ef068f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD20E 10836 bytes
font_01_sfnt_off0000eb0c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0C 16792 bytes
font_02_sfnt_off0001031e.bin
8cb9c03b039ae142084c66ed92b35d02b0cbb08dbd0e965d2e08bb72f98420aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1031E 17584 bytes

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