Malicious PDF — malware analysis report

Static analysis result for SHA-256 539ac2e99a477434…

MALICIOUS

PDF

36.5 KB Created: 2021-10-24 12:19:55 +02:00 Authoring application: Writer (via OpenOffice 4.1.10) First seen: 2021-11-02
MD5: b9c38c277d74ef3870d23ae90c5e2359 SHA-1: c4145d3e4c835924d14e0a0098fd190bc64044cf SHA-256: 539ac2e99a4774340997db99c7510cf3f35c6398f423eb493d791b41503aa7db
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a heuristic firing for PDF_URL_SHORTENER_URI, indicating a clickable URI that uses a URL shortener. The embedded URL, https://megerono.page.link/FLTy, is likely a lure to a malicious site. The ML classifier also flagged this PDF as malicious. No scripts were extracted, but the combination of a URL shortener and ML detection suggests a phishing or malware delivery attempt.

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://megerono.page.link/FLTy 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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