Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbc312b337382d2e…

MALICIOUS

PDF

77.4 KB Created: 2021-07-16 16:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d76861f88156ceb483f80dc001152909 SHA-1: ae52dcc7c95899dfb25e8fdc258da522e3253651 SHA-256: dbc312b337382d2e47d68a7d6136a0ff2329206a31c4f0517e349216d8c53daa
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. The embedded URLs suggest an attempt to redirect the user to external content, likely for malicious purposes. The presence of PDF-specific heuristics further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9001

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/pL_UGxDroB4/square?utm_term=how+many+card+in+an+uno+deck
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f0dd19de4abb1f439169bd/1626397977926/fukidakufiwapofuve.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60f0d6d6c9cf4d40000775d0/1626396374702/courage_to_speak_the_truth.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f1182e6186c43100428db7/1626413103027/driving_lessons_for_beginners.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e89f95f3371a67c0ef8a3d/1625857941927/debriding_a_wound_at_home.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec780f288cf71862a866b3/1626109967122/scrotum_cyst_removal.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_off0000cfb9.bin
95f35a3b0d3f9a2a4a4702bf3cae47f1fa20cd1a0d06e81ae2af89f0424d15c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB9 10604 bytes
font_01_sfnt_off0000e7f3.bin
c66385ae134ef5f917ad5439632930fbb48aa305100de41925cdf072514c9e9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F3 16404 bytes
font_02_sfnt_off0001121a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1121A 16792 bytes

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