Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fd224249548b357…

MALICIOUS

PDF

85.3 KB Created: 2021-07-19 08:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3ddd7ccbeeb1302e1f6703bb7870085c SHA-1: 59d2fca49bf0b957794041c14f9b7cc34633bb54 SHA-256: 8fd224249548b3575c7988b8d1f30e6b3d4e7bd68f81e58100237c397a6f0eda
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 high likelihood of malicious intent. The PDF contains embedded URLs that point to external resources, suggesting it's designed to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8790

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/v-xubMviL4Y/square?utm_term=discrete+event+system+simulation+3rd+edition+pdf+free+download
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e7d1f5dbc52028c83f1947/1625805301137/28520326616.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec868d7a1add4dee1fcc9e/1626113677496/grokking_the_system_interview_free.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f321b5ac7784023569033e/1626546614089/57870409822.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f4f8f6e13ee976661b8d19/1626667254442/67481834168.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec9f6383836e7a7d634ec4/1626120035826/guronizotetujofusuluta.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e90cedf492d21a0f6a1a99/1625885933148/wodojanimuzes.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ede087ebcbe27d0c7e2875/1626202247732/ivy_league_softball_standings.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_off0000e997.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE997 16792 bytes
font_01_sfnt_off000101ae.bin
712f60e692d97c86d9d2c84a10c73d4d072f897b9cacf7c9eca6efd969e930f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101AE 11320 bytes
font_02_sfnt_off00011c67.bin
34163eb793015a9d32bd6ab373f8b333e73857f0cb312b622f374c1b69f8ee0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C67 17032 bytes

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