Malicious PDF — malware analysis report

Static analysis result for SHA-256 f89504144f9b6be1…

MALICIOUS

PDF

115.6 KB Created: 2021-07-13 20:18:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a85fb5686f1e0b074b5509e7a782fc94 SHA-1: dfc53b2018ccfd4c5d4d3fcc246ab8233a8f6e7c SHA-256: f89504144f9b6be14e9c775c2ffabf43aa1f398a9f5a00fd84c95d413278f2d9
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ClamAV heuristic identified this PDF as a phishing trojan. The presence of embedded URLs, despite some being marked as benign, suggests an attempt to redirect the user to malicious content. The 'wkhtmltopdf' authoring application and duplicate object bodies are structural indicators often seen in malicious PDFs.

Machine Learning

  • Nyx PDF Classifier clean score 0.1264

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/hIkXU_AiHkM/square?utm_term=sql+examples+with+answers
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ed7b6a43ec04194fd8a26b/1626176362987/the_glass_house_silver_pantip.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ecd9070124a666ff3bc8c4/1626134791501/61042527927.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_off00016251.bin
e856df7e98f77f2016a2b8f0aed1df6c1f5524d0674669007e0772f402c575a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16251 10804 bytes
font_01_sfnt_off00017b11.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17B11 16792 bytes
font_02_sfnt_off00019323.bin
7fe0a81a4599cad932dfadd09b9176cc58212d5897c4ed1df1e4ef30b46be03e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19323 18024 bytes

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