Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cf098dcbf76e0e7…

MALICIOUS

PDF

114.0 KB Created: 2021-07-17 00:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d53cd14827fb6063279cb6262ca26bcf SHA-1: 8f90b0daefbe9fa0269cbb68496321425fb03337 SHA-256: 2cf098dcbf76e0e72bb48592b53766cdd742911cb275b759fe7118fec28ccfb8
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded URLs, although many are marked as benign, suggests an attempt to redirect the user to external resources. The PDF structure and heuristics indicate it is likely a phishing or malware delivery document, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5909

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/eoPDrVzwpx0/square?utm_term=structure+of+polytene+chromosome
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f05576e481773adf180f53/1626363254343/when_to_plant_turnip_greens.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ee4cf62af4c01978fddbdd/1626230006646/chihuahua_cross_puppies_for_sale.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec8c4351a87c5d75ac604d/1626115139994/c_program_to_reverse_a_string_using_function.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ede8d2afeffb59e67310de/1626204371185/talokapiguxe.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_off00015c8d.bin
0610128f61d06f52ca50da97f45952f86d2e2ba76a921fcb2116bfc5754b9243		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15C8D 17784 bytes
font_01_sfnt_off00018b29.bin
04651cace3f7d3b054f67f8e6c055909d1c3a657ccf894927c4135ad8dcd6168		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18B29 10780 bytes
font_02_sfnt_off0001a3dd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A3DD 16792 bytes

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