Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bc79d311c70d0d0…

MALICIOUS

PDF

75.7 KB Created: 2021-07-13 01:27:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 58075c29014cf66f1f1f9ebf62b98570 SHA-1: 4b1fc2ac1b347e85cb84b43b9583d7b747f671a3 SHA-256: 7bc79d311c70d0d0d5a10f662c6c72341b48cbb2c8ca5824ddaff6efd9f67803
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as a phishing trojan by ClamAV and a machine learning classifier. It contains embedded URLs, suggesting a phishing or social engineering attempt to lure the user to malicious content. No scripts were extracted from this sample, limiting further analysis of its execution behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8802

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=how+long+can+cooked+chicken+stay+outside+the+fridge
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ec944d4f2b1c51afa51f9b/1626117197358/hcho_with_grignard_reagent.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e89c77ddeed5612f665c64/1625857143296/how_to_create_a_blog.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec79fadcef4a49b3a9da9c/1626110458438/get_better_at_sit_ups.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e954fa66be7e490f113196/1625904378583/nuzefetafetajagiluguvat.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e91e6d3ba7d954d5461678/1625890413808/wuninej.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_off0000c34c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC34C 16792 bytes
font_01_sfnt_off0000db63.bin
89d31d2ad99a915dbaa359d958667d1665d647498d72a115272d60ea86c3de26		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB63 11136 bytes
font_02_sfnt_off0000f52f.bin
da92f6cf4e72bb2fa897ab94694cb3a7d735356033384bb562c6abb8d53ec470		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF52F 16768 bytes

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