Malicious PDF — malware analysis report

Static analysis result for SHA-256 535f146958ce42f2…

MALICIOUS

PDF

74.2 KB Created: 2021-07-15 12:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f551ffeca001165836e1f91c4cb6f36e SHA-1: f09610e611e1b0be48d4b540b88289c7734cf669 SHA-256: 535f146958ce42f276394e84f65f84388610027272ca6187f1c6d9c05682194e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains an embedded URI pointing to a Google feedproxy URL, which likely redirects to a malicious site. Although no scripts were explicitly extracted, the PDF structure and the presence of an external URI suggest an attempt to redirect the user to a harmful resource, consistent with phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7260

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/~3/9xivtwLAy4k/square?utm_term=being+bi+in+a+straight+relationship
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ee18c54d490f67274f294a/1626216645244/35633813811.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e8fcb7c14ff043cd5b4d48/1625881783993/pdf_to_a_word_doc.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ee6489aa539923b58907f1/1626236041405/thomas_hobbes_life_in_the_state_of_nature.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_off0000bffe.bin
46592ca35dcec26281df6a07d61fef92db925951e742ddad8e635f8b3a29241d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBFFE 10724 bytes
font_01_sfnt_off0000d85f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD85F 16792 bytes
font_02_sfnt_off0000f071.bin
7fbf5f5ae1ef982910c8cb09d2e276b4ff4543f29994d8dfdd8ca2a48634bf9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF071 16440 bytes

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