Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb63a0c64136b912…

MALICIOUS

PDF

36.5 KB Created: 2021-10-24 12:20:38 +02:00 Authoring application: Writer (via OpenOffice 4.1.10) First seen: 2021-11-07
MD5: c0b3816b44ddde0b8b3f5580e447de25 SHA-1: 15279d9e528bbdda795a4bcdb94abeec87db68ff SHA-256: eb63a0c64136b912121a3527cfd9e2db4fbf1f8e9b00a405e3fd79a120cedcf1
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high-severity heuristic indicating it combines an external action with parser-evasion techniques, specifically using a URL shortener. The ML classifier also flagged this PDF as malicious. The embedded URL, 'https://monsher.page.link/PHZc', is likely the primary vector for delivering a secondary payload or leading the user to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7570

Heuristics 4

  • Clickable PDF combines external action with parser-evasion structure high PDF_ACTION_PARSER_EVASION
    PDF has an external clickable URI together with object graph or xref structures that make parsers disagree, such as divergent duplicate objects, parser divergence, or xref offset mismatch. That combination is stronger than a plain link: the document is both an outward-action carrier and a parser-confusion/evasion sample.
  • Clickable URI uses URL shortener medium PDF_URL_SHORTENER_URI
    PDF contains a clickable HTTP(S) action whose destination is a URL shortener. This hides the final landing page from static review and is common in phishing redirect PDFs.
  • 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://monsher.page.link/PHZc In PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_001_off00000849.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x849 48680 bytes
SHA-256: 8c34682fc5e6e6a391c18cd7cc3bd98dd204348ead104ff3ab6ceab4df5a3cf6

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