Malicious PDF — malware analysis report

Static analysis result for SHA-256 61c5613ff512259e…

MALICIOUS

PDF

87.8 KB Created: 2021-07-17 05:41:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6a13a871b322956c017d90f222c3b771 SHA-1: 36ff73ed442bda4f6ea9d1516999912fc07376ea SHA-256: 61c5613ff512259e848a4f9e5544d9bc8a4ddadf6a4fa54ba8a12ec6a42b81a1
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 presence of an embedded URL, even if flagged as benign in this context, suggests a potential phishing or credential harvesting attempt. The document structure and metadata are consistent with a PDF file generated by wkhtmltopdf, which can be abused to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8172

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/X6hrLWyzjlw/square?utm_term=letter+structure+cae
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ed7a33bde79631d33fe526/1626176051825/tefave.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f20fc95c8a935ec3c7457b/1626476490135/62608347426.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60edfcb41f6a951228731c51/1626209461044/35078022958.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60efe6c097dca740078c9df1/1626334912498/7242086219.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60edf02eebcbe27d0c7faeb4/1626206254532/justice_league_animated_series_streaming.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_off0000f83f.bin
7b1e06bb34abc66200d5705db829a8d12d5c852311198bbc38dd42354ed15d79		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF83F 9920 bytes
font_01_sfnt_off00010e52.bin
1011b31133829b269cd3000dca1df8888d0a40a82dfdf4e941f6ab73fdb50f23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E52 16660 bytes
font_02_sfnt_off000139d7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x139D7 16792 bytes

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