Malicious PDF — malware analysis report

Static analysis result for SHA-256 97cb9214d40d7e5d…

MALICIOUS

PDF

81.1 KB Created: 2020-05-15 20:32:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb63e484c070fb7069475bb2276ef62b SHA-1: 7bb87684a6fdcf0f63f4085a9738012bf82e235a SHA-256: 97cb9214d40d7e5d27a1a358b09d03ca51498ac559b15086696bdc5c3b46b040
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, many of which point to domains that appear to be part of a link farm designed to host malicious content. The document body, though heavily obfuscated, contains a URL that matches one of the extracted links, suggesting a lure to a potentially malicious website. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9661

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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 http://newperspectivemedical.com/uploads/1/3/0/4/130490584/130490584.html#chicago+fire+fc+team+form
    • http://9f60fjd080.com/uploads/1/3/0/3/130312951/1cc0a1b.pdf
    • http://growagrand.com/uploads/1/3/1/3/131379590/jefapu.pdf
    • http://motanum.com/uploads/1/3/1/4/131482933/96c072f934f6517.pdf
    • http://thetabernaclecgma.com/uploads/1/3/1/6/131637457/5718cc90c1bc.pdf
    • http://sneakycone.com/uploads/1/3/0/6/130621691/zesogew_vanajerese.pdf
    • http://duskcollaborative.org/uploads/1/3/0/6/130604612/1e3ef003.pdf
    • http://q-plumbing-drainage.net/uploads/1/3/0/2/130274338/6713126.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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011173.bin
5ae6133d46b9c62e3916028b37a602b427da26ea6e565f501518bf4050d2c7c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11173 11952 bytes

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