Malicious PDF — malware analysis report

Static analysis result for SHA-256 b78a6501c9d0b134…

MALICIOUS

PDF

74.9 KB Created: 2021-07-12 21:32:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 18c3d25aba8daad267f4676db90d3c8d SHA-1: 0cc70d3558780e0330e652d67764733a090eabb3 SHA-256: b78a6501c9d0b1348f437216aea2f3ec34d73ddd63f1b097dc24ad4901950b00
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 PDF contains embedded URLs, one of which is flagged as potentially malicious, suggesting a phishing or credential harvesting attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7788

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/~3/4Ji06Fp1PxY/square?utm_term=nature+comms+submission
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e83f64f0b0395a876f0495/1625833316230/lefinagatobusuviluvi.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec7847de8c3264fe5db995/1626110023398/semispinalis_thoracis_origin_and_insertion.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec795fe94d7a30e05451e6/1626110304047/the_oogie_boogie_song.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_off0000c47e.bin
9a03519aa656a822dcc40bf1061426fd942f83f09241d91cfe3e913155c653cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC47E 17016 bytes
font_01_sfnt_off0000efc9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC9 16792 bytes
font_02_sfnt_off000107e0.bin
aa511c8a9ec8a34e287f70e85a20d34971118795f7f06e23f85fd3a8c87d6bef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107E0 10560 bytes

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