Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6ad5fa538dde540…

MALICIOUS

PDF

79.8 KB Created: 2021-07-15 23:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8692b08c8a2a8a95857fc9a1879f52c6 SHA-1: ad2079332ace9755af2243ed6932b26ad6556a92 SHA-256: c6ad5fa538dde540b2d127d7d9fcef2b33016c5a157edd9817f1f84f0e77b955
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains embedded URLs, one of which is https://feedproxy.google.com/~r/razvivatel/yapz/~3/AG-UZpNbJGc/square?utm_term=incontestability+period+meaning. While the document body is heavily obfuscated, the presence of external URIs and the malware detection strongly suggest a phishing or malware distribution attempt, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8374

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/razvivatel/yapz/~3/AG-UZpNbJGc/square?utm_term=incontestability+period+meaning
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60edaa54881afe0f0ced0679/1626188373159/lifesaving_society_first_aid_test_answers.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f0711e5ea0710b9d50486b/1626370335069/71941884083.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ee47238685745b7d159eca/1626228515739/finding_the_equation_of_quadratic_function_given_the_table_of_values.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ee25c50a53c127f5d6f520/1626219973734/horrible_comparative_and_superlative.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e932db8ce0e10532d34168/1625895643948/86084107032.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_off0000da57.bin
bc4c89ac5fb0c15c9abfd81c4419dc7512c2037f819a7022d114c1e403039fd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA57 11060 bytes
font_01_sfnt_off0000f3b9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B9 16792 bytes
font_02_sfnt_off00010bcb.bin
aa033025cbba1524071d4f8dd05859123278a332a62048525a36c3a8cdeb4974		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCB 15832 bytes

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