Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ffa2bd6c48113e3…

MALICIOUS

PDF

88.4 KB Created: 2021-07-15 13:11:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9dfd3953a774e7cb1651247394fdef8f SHA-1: 5e95714510720d6812c7fff4243b88c5048fa40d SHA-256: 7ffa2bd6c48113e37db38655ca247013d122f735f3cfef56dd15c8cf961a33de
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a Pdf.Phishing.Trojan signature. It contains embedded URLs, one of which points to a Google feed proxy that redirects to a PDF file, suggesting a potential phishing or malware distribution lure. The document body is heavily obfuscated and unreadable, indicating an attempt to hide its malicious intent.

Machine Learning

  • Nyx PDF Classifier clean score 0.1630

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/NsX9ihectO0/square?utm_term=book+of+humour+by+ruskin+bond+pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e93ace27127e680416c38a/1625897678660/addition_and_subtraction_word_problems_year_3.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_off0000f772.bin
11df3784ac41d50dddbd59539d480f6c277ee1dac4b9ec8eb86246a1cbcc62b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF772 10824 bytes
font_01_sfnt_off00010ff7.bin
e4ebb2855bdede2fffb445ae4bc20c70cc8f37a79a365e0c8217a3a89e11e893		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF7 17064 bytes
font_02_sfnt_off00013c7d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C7D 16792 bytes

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