Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8fcc2385261fe4b…

MALICIOUS

PDF

83.9 KB Created: 2021-07-17 14:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 33dd360b043ea99784b673a2fd4dd224 SHA-1: e83972f1139698cfd0f9c306acc189a666f1a92f SHA-256: c8fcc2385261fe4b141844c42838d7027cfc20d647cf0869e5e207d78d849995
96 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating it likely exploits a vulnerability or employs social engineering. The presence of embedded URLs suggests it is designed to redirect users to malicious sites or download further payloads. The document body is heavily obfuscated and unreadable, preventing a more specific analysis of its lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6688

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/um1bUVUAM38/square?utm_term=oscars+2017+best+picture+nominees
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f009b55740a719f4ac92bc/1626343861599/10738968750.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e8e51a1448b061984597a5/1625875738842/91835081581.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec8670fe047727940bf7f8/1626113648280/38905349819.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_off0000e2aa.bin
83fbb54c98413b717e4a4711f8567a0c41bd261f6ad32964433421ccc89355d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AA 11100 bytes
font_01_sfnt_off0000fc76.bin
8189666b086c02e680295f81e0d506fdd2741aad67964507339054bf7248025e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC76 17536 bytes
font_02_sfnt_off00012a41.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A41 16792 bytes

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