Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b2b9eb064b789db…

MALICIOUS

PDF

36.2 KB Created: 2020-06-08 00:41:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30be932cfd47110b2ad2196db3b2f7f7 SHA-1: 0acb27e36176db293f45c830c6db924f025cf3ff SHA-256: 5b2b9eb064b789dbb5e6e5c9f0026bb2252b5e5d1204cbbdb979a2b663cb199e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, many of which are numerically or generically named, indicative of a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. The primary purpose appears to be directing users to potentially malicious or deceptive external websites, as evidenced by the numerous URLs and the 'PDF_SEO_LINK_FARM' heuristic.

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://avidaenglish.com/uploads/1/3/1/8/131871829/131871829.html#recuva+en+espa%25C3%25B1ol
    • http://norby.consulting/uploads/1/3/1/4/131452771/bed48.pdf
    • http://sfcnewhire.com/uploads/1/3/0/7/130776750/b99fe5887f93.pdf
    • http://mx.agike.com/uploads/1/3/0/4/130488498/vurifi.pdf
    • http://pushpakav.com/uploads/1/3/0/2/130272571/bimarafa.pdf
    • http://hostmaster.mikenoelsmith.com/uploads/1/3/0/6/130604502/1056651.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://vajowobago.files.wordpress.com/2020/06/53876179129.pdf
    • https://sowapije.files.wordpress.com/2020/06/pebol.pdf
    • https://sufunitazot.files.wordpress.com/2020/06/gutore.pdf
    • https://dodiguwowem.files.wordpress.com/2020/06/sixazikilabemuje.pdf
    • https://jeraneb.files.wordpress.com/2020/06/dusab.pdf
    • https://muburojiz.files.wordpress.com/2020/06/48375721511.pdf
    • https://wolodexizip.files.wordpress.com/2020/06/zitevositegobuzosa.pdf
    • https://guzubuxokom.files.wordpress.com/2020/06/gefakunuforixedifepep.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006015.bin
df4b944e9b96168eb1e543743df72d0835213a3774fb0407cf5c3737836093dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6015 11204 bytes

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