Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4285ebf58634b9e…

MALICIOUS

PDF

77.8 KB Created: 2021-07-14 07:44:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d752b59412b666532edb9b4fc07ad209 SHA-1: 8f52011c958eb5f5eda8c2dbf5db4c551a487b5c SHA-256: c4285ebf58634b9eb6b42b7d5b9d6492b88081f32ece157200aaefa6e60ff622
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was classified as malicious by ClamAV and an ML model, indicating a high likelihood of malicious intent. The presence of embedded URLs, though many are marked benign, suggests an attempt to redirect the user. The PDF structure and embedded artifacts do not reveal specific scripting behavior, but the overall detection points to a phishing or credential-stealing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8827

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/XMoLd4EPXkg/square?utm_term=one+pan+chicken+meals
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e860fdcb142a1539d6d13d/1625841917852/end_of_life_counseling.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e952b42a6f785f5835e212/1625903796829/call_out_to_meaning.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e936c2b9b95949b65f6ecd/1625896642836/6983630106.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec993e4f558d0bf39dc72c/1626118462983/ambitious_in_tagalog.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ee1c7d2485902f3e70e92f/1626217597544/how_to_endorse_a_check_to_another_party.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ee347f02e0767984f2e7f4/1626223744184/51209200808.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_off0000ccaf.bin
d04c0bd632f6e5d8601cd982e07e1ee06ad257cde18a4c94d6c3497d99c05296		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAF 10440 bytes
font_01_sfnt_off0000e426.bin
0d5ff247dca59325bf35d48e62db0792c74bacc26cb363abb45463daeb6107db		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE426 17488 bytes
font_02_sfnt_off0001122f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1122F 16792 bytes

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