Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eec21a59cba6676…

MALICIOUS

PDF

74.3 KB Created: 2021-07-13 21:00:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a6d4ec61aae2eb1b97328a5a7a933447 SHA-1: 6e965a693845620a75d0f2a3c71d13a7c9bb5928 SHA-256: 9eec21a59cba667603b1619b3015ab750312662e9ff59e186d65fc1bf6729a5e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was identified as malicious by a ClamAV signature and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded URLs, despite some being marked as benign, suggests an attempt to lure users to external resources. The PDF structure and heuristic firings point towards exploitation for client execution, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6911

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/r_nBws6J8g8/square?utm_term=computer+science+class+10+book+pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ec822340121f566899d47d/1626112547472/pacific_university_athletic_training.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e8bb9fc5d97713370812c2/1625865119915/3_pm_edt_to_ist.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e9013b563c1506a8b4d06e/1625882940077/how_to_drive_a_manual_4_wheeler.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e88c75d0776f4d52cda019/1625853045897/singular_and_plural_spelling.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_off0000befb.bin
9d460d0d4d9fe146ffa0d0568bae69d4c1ec5fff3734006d2817217a32b59aa0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBEFB 11320 bytes
font_01_sfnt_off0000d96b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD96B 16792 bytes
font_02_sfnt_off0000f17d.bin
cc9bc8833e7d94bd02a6ac6554097c7a325773bf28db5b4c3f1d9854473952ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF17D 16428 bytes

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