Malicious PDF — malware analysis report

Static analysis result for SHA-256 af20c861c831b12d…

MALICIOUS

PDF

78.2 KB Created: 2021-07-21 01:47:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2fe37480ccbeb2d8cb36bcef754b7109 SHA-1: 6012ca65ff0122d25ca4014dde708f3ea1fa91fe SHA-256: af20c861c831b12dc9300d4fbe07a19d2652e32745ebc21abbb80b98908f963e
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV, specifically as a phishing trojan. The presence of embedded URLs, even those confirmed benign, suggests an attempt to lure users to external resources. The file's structure also indicates potential manipulation with duplicate object bodies, a common tactic in obfuscating malicious content within PDFs.

Machine Learning

  • Nyx PDF Classifier clean score 0.1658

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/UkUWPC8UKDU/square?utm_term=linux+like+terminal+for+windows+10
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f1266bb348e55d1c51802a/1626416747864/3_types_of_joints.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f3a1f8699a8678c57ebb9f/1626579448320/39966649402.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_off0000d09a.bin
18a91f9b065f90dd8fd58ee0afe66475349dc7701ef3c49071cf3a0d6f77c704		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD09A 11024 bytes
font_01_sfnt_off0000ea4f.bin
9b38ce16a87b9042c9bcd99ae9d3759160b696814a9cb7efe28e6bae3e8bc244		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4F 16052 bytes
font_02_sfnt_off0001138a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1138A 16792 bytes

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