Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bda933f3383b8d2…

MALICIOUS

PDF

75.4 KB Created: 2021-07-13 18:46:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 98260dd618e8c6acf63bbca08f468afe SHA-1: db30e542665b17acb35c23b5ea3d00de64c9ec7f SHA-256: 5bda933f3383b8d294baa25f38141db5fd75581a340ddfb448509a9c07d6ad4a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded URLs suggests it may be used for phishing or to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with common attack patterns for malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7395

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/~3/4Ji06Fp1PxY/square?utm_term=staying+in+a+relationship
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60edaab546a7611a87d0b108/1626188469826/exurb1a_the_fifth_science.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60eda152881afe0f0cec2767/1626186066771/39234365030.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e8cd50b80adc27fb5913c5/1625869648282/how_to_add_more_in_one.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_off0000c54c.bin
bb60360973edb96853beffc2fc58bc063c7f1ba5421b161f8d224dbe4e1e61ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC54C 10720 bytes
font_01_sfnt_off0000ddd9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD9 16792 bytes
font_02_sfnt_off0000f5eb.bin
0d1e367f31a9f2db2adf039e889d5bc7f06141edb69a5c443e8edbe02c90f643		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EB 16456 bytes

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