Malicious PDF — malware analysis report

Static analysis result for SHA-256 1131bec220797f88…

MALICIOUS

PDF

1.80 MB
MD5: 3fceacd509d5bf5acab8246f833bd6f9 SHA-1: 701490c6b1e86eaae780a1a9019bb29d8f7a1172 SHA-256: 1131bec220797f886b52282bc9bb09a7f737a032218bcbaf1fbc1bbc484cb4be
64 Risk Score

Malware Insights

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

The sample is a PDF file exhibiting a malformed JPEG2000 box structure and an unusually high stream count, indicative of obfuscation or heap spray techniques used to exploit a vulnerability. The embedded URLs, while benign, are present within the document structure. The primary attack vector is likely exploitation for client execution, potentially delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier clean score 0.0004

Heuristics 4

  • Malformed JPEG2000/JP2 box structure high CVE related PDF_JP2_BOX_ANOMALY
    PDF embeds JPEG2000/JP2 data with malformed box sizes. This is a parser-exploit indicator for JPX/JPEG2000 CVE families, not a unique CVE fingerprint.
  • Unusually high stream count medium PDF_MANY_STREAMS
    PDF contains 501+ stream objects — may indicate heap spray or heavy obfuscation
  • 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 http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/pdf/1.3/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://www.iec.ch

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
icc_00_off00000f6f.icc
2b3aa1645779a9e634744faf9b01e9102b0c9b88fd6deced7934df86b949af7e		 pdf-icc-profile PDF ICC profile at offset 0xF6F 3144 bytes

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