when create a new user into AD by default permissions also added for share point site

HI

i have a sharepoint farm.

when i create new  user in AD, by default below permissions are added to that user,

how its happen ?

site permissions:

View Web Analytics Data  

Browse Directories  -  Enumerate files and folders in a Web site using SharePoint Designer 

and Web DAV interfaces. 

View Pages  -  View pages in a Web site. 

Enumerate Permissions  -  Enumerate permissions on the Web site, list, folder, document, or 

list item. 


List permissions:

View Items  -  View items in lists and documents in document libraries. 

Open Items 

View Versions  -  View past versions of a list item or document.  

View Application Pages  -  View forms, views, and application pages. Enumerate lists. 

Use Remote Interfaces

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adil