Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4a66b08cc39e668…

MALICIOUS

PDF

77.6 KB Created: 2021-07-13 21:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 972b0ce55cc70d101992163fbc24a954 SHA-1: d58ac6b68595e1f7ea311dfbc4603bceeb472d8b SHA-256: f4a66b08cc39e668bcdbd6c89733decf6e612672d405c42bcbb6873d9f40ae30
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by both ML classification and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded URLs, despite some being marked as benign, suggests an attempt to lure the user to external resources. The PDF structure and heuristic firings point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7056

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/~3/4aHNpQc2m6I/square?utm_term=chemical+reaction+engineering+pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60eddded2799685454f8fabd/1626201582148/sslc_second_language_english_question_papers_with_answers_2020.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec8b52d0153e73bf8cb25a/1626114898916/21813848645.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60edc3dd8e89d93564d2243e/1626194909686/baby_chinchillas_for_adoption_near_me.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec8bb23080d76c7a510836/1626114994173/i_just_want_a_rollie_rollie_rollie_lyrics.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_off0000cbd9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD9 16792 bytes
font_01_sfnt_off0000e3f0.bin
9e18fafb27ae220733aa2740979d5988aff09729db2d4b1a22dba9a044abf632		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F0 10932 bytes
font_02_sfnt_off0000fcdb.bin
60074f3951e5ec82830ce962a1c360cb25cb04549aa8166a132dfd1ab2809652		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDB 16920 bytes

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