Malicious PDF — malware analysis report

Static analysis result for SHA-256 8827a0d51bca7069…

MALICIOUS

PDF

88.1 KB Created: 2021-07-16 13:39:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9412d87dbc849170a54ce6e80b44bb33 SHA-1: 353cbec30b3a0b3b9c91ff4854c0571006d0d681 SHA-256: 8827a0d51bca7069fddd650ca11467fe1d74795499ebdb17599689fba4fe0728
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan, indicating a malicious intent. The presence of embedded URLs, though currently flagged as benign, suggests a potential phishing or redirection mechanism. The PDF structure itself contains duplicate objects, which can sometimes be indicative of obfuscation techniques used to hide malicious content.

Machine Learning

  • Nyx PDF Classifier clean score 0.1448

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/~3/5VO7y1TeAqQ/square?utm_term=gif+to+webp
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ee50818685745b7d164040/1626230913879/enlarged_spleen_and_bloating.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f02dc0fdf15601434cbf2f/1626353088155/8283747655.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_off0000f889.bin
9598b630ee95b20d08477c4b832e98b26458f6593894cc568efbf61bd8da6014		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF889 10036 bytes
font_01_sfnt_off00010ed1.bin
8b9c71aadf46862111992ccfe47abc618e42bc5326279a86a6b76935dee4bf1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED1 17564 bytes
font_02_sfnt_off00013d0a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D0A 16792 bytes

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