Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc99f2e2e710dd1f…

MALICIOUS

PDF

73.5 KB Created: 2021-07-15 17:02:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e743d551a9b6b96c33aebcf6f87a97aa SHA-1: 9109235221dc30e0b6f87c3192d8b8135fd27c6b SHA-256: bc99f2e2e710dd1f308f11c862358f05e243e1fb9bfaf944a8d3fbbbf4495a77
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with a heuristic indicating an embedded external URI. While the specific URL appears benign, the presence of such links within a PDF, combined with the overall malicious verdict, suggests an attempt to direct users to a potentially harmful site. No scripts were extracted, limiting further analysis of the execution chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8315

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/HbdJGeoIq_s/square?utm_term=7+day+gm+diet+plan+for+weight+loss
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ed3da5c927da2a63f88abf/1626160549254/pine_barrens_forest.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec904caf807f1e15265ddd/1626116172891/blood_type_punnett_square_practice_answers.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ee4810df274736e0ac6586/1626228752661/how_do_you_say_pizza_in_spanish.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f01cf8b37dc55b03516f6f/1626348792603/55995910292.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ed9a49c2b60e0ed5b4b3c8/1626184265770/the_press_crossword_answers.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_off0000c157.bin
bc0af133ac777c9dd6c7d7948e50ea2cddb4002a171b1223fd5baa0afeace2fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC157 11100 bytes
font_01_sfnt_off0000dae2.bin
494c134594360f45017a682595060bce36694ce25e5ab673a65f7a7a1a3d5caa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE2 15360 bytes
font_02_sfnt_off000101d4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101D4 16792 bytes

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