Malicious PDF — malware analysis report

Static analysis result for SHA-256 0de3d0e1fbe84b3f…

MALICIOUS

PDF

87.2 KB Created: 2021-07-13 11:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 274a0b397e7c787dfe52a9e36da7fa76 SHA-1: 8ddfa4433cb95e455dd8959ee184bebc6ccb8cde SHA-256: 0de3d0e1fbe84b3f8d37632c9558e25ce799365fcab69588f164dcac26612b3e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with a heuristic indicating an embedded external URI. Although the document body is heavily obfuscated, the presence of PDF_URI and ML_NYX_PDF_MALICIOUS firings strongly suggests a phishing or malware delivery attempt. The embedded URLs, while some are marked benign, point towards a potential distribution vector for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6359

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/sq/ugae/~3/UkUWPC8UKDU/square?utm_term=a+pure+chemical+substance+with+its+own+characteristic+atomic+structure+and+chemical+properties
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e8a92a37faa2302622cbd4/1625860394123/ast_and_alp.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e952c819a9f87deb746668/1625903816620/pulp_and_paper_chemistry.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e93ffe2a6f785f583557e7/1625899006083/kuludewopiso.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_off0000f131.bin
f467ae6efb8b65a0a6675172970905e8f33d5d96b2803e0fb4f363bc5af6f838		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF131 11088 bytes
font_01_sfnt_off00010ab5.bin
a54366560dfec546bd4a7f177b4cad24cefd2f98e39a20301b7c2bffa64ebdbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB5 17260 bytes
font_02_sfnt_off0001381d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1381D 16792 bytes

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