Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ba06e4ca451bfe4…

MALICIOUS

PDF

35.5 KB Created: 2020-04-06 11:46:52 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 8126952560b07e68f318e8b230979254 SHA-1: df58d9d020d5c44f606853b03e05d2df9158b79b SHA-256: 7ba06e4ca451bfe4073d948ef1d0dd52446ea556ae2c05fe19cce0067326a473
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded external links, as detected by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. These links likely serve to redirect users to malicious websites or to manipulate search engine rankings, a common tactic for SEO spam or phishing campaigns. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://hello-baby-toys.com/uploads/1/3/0/5/130588296/130588296.html#short+run+and+long+run+marginal+cost
    • http://modernbrideinnh.com/uploads/1/3/1/0/131070858/kebevafesas_levulupegefo_sosovarijise_wajuruzux.pdf
    • http://cherillee.com/uploads/1/3/0/4/130436224/b1b6615.pdf
    • http://sbcihurtsworkers.com/uploads/1/3/0/4/130436080/fe356135d06e03.pdf
    • http://handbookforhumanity.org/uploads/1/3/1/3/131398324/15e4f6301ce8e4.pdf
    • http://aubreyswarriorsfoundation.org/uploads/1/3/0/4/130476208/duxepafoxum_fexinerakamoj_rujugulutosum_bepaketufuxar.pdf
    • http://themorganthomas.com/uploads/1/3/0/4/130476143/rawowonu-jodediv.pdf
    • http://needlot.net/uploads/1/3/0/6/130639504/6023576.pdf
    • http://del-mar-california-homes.com/uploads/1/3/0/7/130740138/1848733.pdf
    • http://ronanlawgroup.com/uploads/1/3/1/3/131380299/diwegofufubugebixe.pdf
    • http://soundteaching.ca/uploads/1/3/0/8/130874276/1473d4ac6e69a68.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_off000065d4.bin
25bafb405a412450ac88008ac18bd5d4030fbd2eedb20c81fc11a6ee6ee5c2e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65D4 6892 bytes

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