Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea3ea0cf451a867b…

MALICIOUS

PDF

76.7 KB Created: 2021-07-21 07:56:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d13cdb04c3298dc52e0f339d264f850c SHA-1: 7df3e08b695cc1339e1dcdc458b7d7df2d06d858 SHA-256: ea3ea0cf451a867b83f1c561755da406e55df538f2f67508896deba7c678078b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains embedded URLs that, while some are marked benign, suggest an attempt to redirect the user to malicious content. The PDF structure itself is suspicious due to duplicate object bodies, and the authoring application 'wkhtmltopdf' is unusual for a typical document, potentially indicating a custom exploit or obfuscation technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7604

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=thick+and+thin+straight+up+braids
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f50694e13ee976661c397a/1626670741099/scenario_based_data_modeling_interview_questions.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f7939d95055530dd167907/1626837918092/71514756704.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f4bc857f94c710fbd58a8e/1626651781337/41812508317.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_off0000ca3a.bin
b543570e59dc4e4c1348f59c0ad93ba3c32909bd15b7173578db050b17d58ba0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3A 10788 bytes
font_01_sfnt_off0000e297.bin
85a7102681e3e12a947ff2b772d0bd30289b76e1c318d7c64901d5394988cfb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE297 16984 bytes
font_02_sfnt_off00010ec5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC5 16792 bytes

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