Malicious PDF — malware analysis report

Static analysis result for SHA-256 decbe6b136a3eff3…

MALICIOUS

PDF

76.7 KB Created: 2021-07-15 20:41:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 24ddde7f13b400b5fed6e69075014de5 SHA-1: 930786127df294609a2ea814709152d911fc0ced SHA-256: decbe6b136a3eff3d5958394bb7e91c77e17d961f73c032fdc04d722080fe660
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains an embedded URL that leads to a suspicious domain, likely for phishing purposes. No scripts were extracted, but the presence of external URIs and the phishing detection suggest a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8972

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://allytemp.ru/square?utm_term=the+commands+of+christ
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e95e17b630645a0ef92470/1625906711794/2004_bmw_owners_manual.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ec79fb72e2584f24624183/1626110459399/8148500641.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ee6a872d09e34b72a2bb37/1626237575587/solution_manual_for_signals_and_systems_2nd_edition.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60f014040dea5e4896bded9d/1626346500585/action_words_and_phrases_4th_standard.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ed9fd0f53e3457ef87127f/1626185681018/lack_of_prosecution_meaning.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e7679c856bf3314cc7c80a/1625778076146/84312539015.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_off0000cca1.bin
af1cf7a43b0c2ad831d8304ee3f07df8914671027e29874770aa99cdf19fc78c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA1 16236 bytes
font_01_sfnt_off0000f6a6.bin
9db15c82094879d4563199905251d31e6d667eb6c7d46eb9353455d05bc9a069		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A6 10660 bytes
font_02_sfnt_off00010ee2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE2 16792 bytes

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