Malicious PDF — malware analysis report

Static analysis result for SHA-256 182a2ef7ccf4c3df…

MALICIOUS

PDF

75.2 KB Created: 2021-07-17 17:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a635ae4df06be911c9336f59dbc589a6 SHA-1: e64bc13dc050e5850dd25d60aaf7b48bdb84f021 SHA-256: 182a2ef7ccf4c3dff4b315ffd3609a58fa21c40095d050f7744b85d5346977c0
96 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded URLs, despite some being marked as benign, suggests an attempt to redirect the user or download further malicious content. The PDF structure and heuristics indicate it's likely an exploit delivery mechanism, potentially leading to client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7788

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/UZrB20b2Dcg/square?utm_term=palindromes+and+anagrams
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ecc9dc21140c20d8542053/1626130908315/riferuwiveru.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f05a546506dc6429e69142/1626364500181/zexetepebifeparagazegala.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ec8f1bf4b4775d04a01f43/1626115867282/puxewududawuvame.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_off0000c65f.bin
e2b92ab8c957e047f46a8bae933d80ee89c4315f97ac4a02f156d6f4e9120693		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC65F 16844 bytes
font_01_sfnt_off0000f19e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF19E 16792 bytes
font_02_sfnt_off000109b5.bin
d525dd52c583d622ff53cf7b2617859ccfb9bdcdfdf6a32951058300876b1832		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109B5 10496 bytes

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