Malicious PDF — malware analysis report

Static analysis result for SHA-256 f112da6055a71623…

MALICIOUS

PDF

71.3 KB Created: 2021-07-18 18:39:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9e97aa7a09761ccd8a7d1a9fa1f77fb8 SHA-1: b056a744796112331440269fa3a756e7b9126b82 SHA-256: f112da6055a7162357fe74a47b8a9d63046108ab8f2f379a5109e9c67a304c0f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of embedded URLs, despite some being marked as benign, suggests an attempt to redirect the user. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall context points to a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6583

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/kVSxLQpkboc/square?utm_term=function+overloading+in+oops+with+example
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e7bb0228bb5f4f5161a347/1625799426946/the_best_gynecologist_near_me.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f073446a22b22fd8a47fcf/1626370885074/fundamentals_of_corporate_finance_2nd_edition_answers.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f3c230ce637c25833f1838/1626587696875/diff_function_in_r.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_off0000b7bc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB7BC 16792 bytes
font_01_sfnt_off0000cfce.bin
35ebd8e88599aa546df5b97829fe4917b87bf1ebe76ee878e82af6e12a23c59d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCE 15416 bytes
font_02_sfnt_off0000f714.bin
c5d82fd9cce7a2d757d42b0ad27d5aa050a5556aa8c2101b0d40571580872434		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF714 11292 bytes

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