Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cfc01f0ce71a981…

MALICIOUS

PDF

35.5 KB Created: 2020-06-04 13:15:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa64f470f95b88413530a9190afae83c SHA-1: 3fa41d7622c4b958ec0bc72e0ba7ac6147d62541 SHA-256: 9cfc01f0ce71a981b9ca731f3433cf8d84bc10a348265f1837b21793ea5e239d
94 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file exhibits characteristics of a link farm, with numerous embedded external URLs pointing to various domains. The heuristic PDF_SEO_LINK_FARM specifically identifies this pattern, suggesting a potential attempt to manipulate search engine results or distribute malicious content through a large number of linked PDFs. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://maamen.net/uploads/1/3/0/7/130738740/130738740.html#a19+bulb+vs+e26
    • http://postmaster.the-pa.nl/uploads/1/3/0/6/130604456/jixen-gegetobufuk-pijokuwigidaf-taginupifuw.pdf
    • http://womackhuntingclub.com/uploads/1/3/0/7/130738615/desewadibo_vunipetojonitod.pdf
    • http://mail.brandonvalleybaptistchurch.org/uploads/1/3/0/8/130814345/9335850.pdf
    • http://vowsweddingdresses.com/uploads/1/3/0/6/130604233/d8f88.pdf
    • http://bestmdxshawd4dr.net/uploads/1/3/0/2/130288626/ad2086799cd.pdf
    • http://mhcsltd.org/uploads/1/3/0/9/130968942/5012680.pdf
    • http://maamen.net/uploads/1/3/0/7/130738740/terms.html
    • http://maamen.net/uploads/1/3/0/7/130738740/dmca.html
    • http://maamen.net/uploads/1/3/0/7/130738740/policy.html
    • https://lezasan.files.wordpress.com/2020/06/75467610643.pdf
    • https://wuwafeved.files.wordpress.com/2020/06/3021855859.pdf
    • https://xevubimeroz.files.wordpress.com/2020/06/segabu.pdf
    • https://gibagiteje.files.wordpress.com/2020/06/girobemomozux.pdf
    • https://pivimepigu734724578.files.wordpress.com/2020/06/sarumibezusolotaralezezeg.pdf
    • https://tabajizivew.files.wordpress.com/2020/06/zozoxim.pdf
    • https://vogajakojoge.files.wordpress.com/2020/06/98879678016.pdf
    • https://mefamebag.files.wordpress.com/2020/06/29357179714.pdf
    • https://seruluxazuje.files.wordpress.com/2020/06/38861435424.pdf
    • https://wizajam.files.wordpress.com/2020/06/38033968079.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_off00005f3d.bin
4ddbcfc52b30eafb16b0d3f5e0d26f37ef867e8ae97deee7fd0076a3e3a9da87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F3D 10448 bytes

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