Malicious PDF — malware analysis report

Static analysis result for SHA-256 cebde8223c55ad52…

MALICIOUS

PDF

76.6 KB Created: 2021-07-15 23:31:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fe27902de2c0076af6c0071baed612e1 SHA-1: 2a3eda22ce4e7ff35b49e17dd0fdf9b256af1efd SHA-256: cebde8223c55ad5299a43f3a0e00da56a78f975e0e1b24e514f3508f85dc763b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The presence of embedded URLs, although many are marked as benign, suggests an attempt to redirect the user to potentially harmful content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall indicators point to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9125

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 http://www.englishaula.com/en/fce-fone-part-2-exam-1-fce-cambridge-first-certificate-english-
    • https://feedproxy.google.com/~r/razvivatel/yapz/~3/UQ8tT55rDuk/square?utm_term=fce+speaking+comparing+pictures
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e7991157d2352c92787c1f/1625790737510/witchcraft_in_europe_400_to_1700.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e8c4501baabd329ba5b811/1625867345038/63538119252.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ee28cc7d49fb55d6261ad0/1626220749001/negative_coombs_test_means.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec8d5c7d354a5e86a38980/1626115420159/gekegifat.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e8e69dcc7c08645923e308/1625876125231/minecraft_trial_for_windows_7.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_off0000cbee.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBEE 16792 bytes
font_01_sfnt_off0000e405.bin
5d1d0a127745238ada911334ca2365ffccbfdf57b7553c334c378bd4ff224cb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE405 10840 bytes
font_02_sfnt_off0000fd13.bin
8879a84f79be81c625594bbad1cb42d20f4818a66864634a4d36e48998860711		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD13 16192 bytes

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