Malicious PDF — malware analysis report

Static analysis result for SHA-256 d828d1335c112d93…

MALICIOUS

PDF

100.3 KB Created: 2021-07-13 21:14:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3f1c5461b7ba1f30206051346c1a39bc SHA-1: 87621f58d4abc2945e75ad0ed0762ba19bd90d90 SHA-256: d828d1335c112d9322708e06fd5030fe9bbf43182d65ae6efed736d252b1b3f5
66 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan, indicating malicious intent. The presence of embedded URLs, though many are confirmed benign, suggests an attempt to redirect the user or download further malicious content. The PDF structure itself shows signs of manipulation with duplicate object bodies, which can be used to hide malicious code.

Machine Learning

  • Nyx PDF Classifier clean score 0.1321

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/razvivatel/yapz/~3/gPkW7oTCsL0/square?utm_term=different+types+of+creative+arts
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60edc7872799685454f6aa41/1626195847678/19270399624.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec9386831aaf5e928b9621/1626116998948/transition_css_multiple_properties.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_off0001209e.bin
797b86c07311f4fb996614e926900148b9fde53228b06857b5b4a479b2478509		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1209E 20236 bytes
font_01_sfnt_off00015512.bin
87151d0dde7fc10f1623a4e0226d0d528bf54b28a4cef5ac48bbdcc7e14fa6c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15512 10608 bytes
font_02_sfnt_off00016d89.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16D89 16792 bytes

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