Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd458cfa1f082724…

MALICIOUS

PDF

83.5 KB Created: 2021-07-18 06:25:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c56f2e71a9a33a53cdcc09117b7772fa SHA-1: 9427be8ec2aa0fb7bd845465c9367da092a974d5 SHA-256: bd458cfa1f08272487bc9921a877021b71c606d73fd3482098e4d63168f851c9
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a phishing and trojan detection. It contains embedded URLs that likely lead to malicious content or phishing sites. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to external resources, which is a common tactic for malware distribution or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3911

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://feedproxy.google.com/~r/sq/ugae/~3/v-xubMviL4Y/square?utm_term=in+spite+of+although+difference
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f2a1489c7c9f0ea992ac6f/1626513736718/computer_architecture_and_assembly_language_book.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ec85103a853d606aecbdd2/1626113296190/pojuzeguz.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f13751c825a553dff56e9e/1626421073693/43356812917.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdfd.bin
90661fd7fcbbcdb89f2c2b04014ac21fd52e004730ad177c675e052565e05515		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFD 10948 bytes
font_01_sfnt_off0000e71e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE71E 16792 bytes
font_02_sfnt_off0000ff30.bin
729d5934ec453f4c5e7d11ba649b0e07a95b874768e4a051f733658f1256b7d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF30 17412 bytes
font_03_sfnt_off00012adb.bin
f06cddf61c9925e39e47a8b8d88d5d2c108808d867bf63b528aab798a6fb49b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12ADB 16104 bytes

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