Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8b77704890ae1b2…

MALICIOUS

PDF

74.9 KB Created: 2021-07-15 13:34:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 475054b1fd7dba19b69dd1a0cca3f5ae SHA-1: c76599a6a67d4d373bb9b1bcc1458e2f08e81029 SHA-256: c8b77704890ae1b20ea83a49b13e509b4b0c2ebdf6d6c299f7ddebd8f47a33c6
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier. It contains an embedded URI pointing to a suspicious domain, which is likely intended to host a phishing page or malware. The PDF structure itself appears to be malformed, with duplicate object definitions, suggesting it was generated programmatically for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8872

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://allytemp.ru/square?utm_term=names+for+baby+boy+from+n
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f00792874a183f1c40d858/1626343314418/singing_and_the_actor_gillyanne_kayes.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ed88685eed834fcc37e086/1626179688674/creed_2_free_movie_online.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ee447f39b82603386a9cee/1626227839941/mifub.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60efdaca365a201d3c37e053/1626331850820/types_of_soft_computing_techniques.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e8cffb3bde986563e46368/1625870331324/48730786442.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_off0000c4e7.bin
c27cf4278964f9aebc7b0520f658cbdca8e41542a46032cf13a6c2247dd48476		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E7 16604 bytes
font_01_sfnt_off0000f048.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF048 16792 bytes
font_02_sfnt_off0001085f.bin
a9316a7d41baa006a43971f1cefb41d31e0c226855a9f996abfd6254d17c3b82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1085F 10368 bytes

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