Apex domains cannot have CNAME records.
Question and response
Question
dig pmweb.com.br. NS
Answer
pmweb.com.br. 5 NS ns-559.awsdns-05.net.
pmweb.com.br. 5 NS ns-1737.awsdns-25.co.uk.
pmweb.com.br. 5 NS ns-460.awsdns-57.com.
pmweb.com.br. 5 NS ns-1287.awsdns-32.org.
Authority
The response has no authority records.
Additional
ns-460.awsdns-57.com. 5 A 205.251.193.204
ns-559.awsdns-05.net. 5 A 205.251.194.47
ns-1287.awsdns-32.org. 5 A 205.251.197.7
ns-1737.awsdns-25.co.uk. 5 A 205.251.198.201
ns-460.awsdns-57.com. 5 AAAA 2600:9000:5301:cc00:0:0:0:1
ns-559.awsdns-05.net. 5 AAAA 2600:9000:5302:2f00:0:0:0:1
ns-1287.awsdns-32.org. 5 AAAA 2600:9000:5305:700:0:0:0:1
ns-1737.awsdns-25.co.uk. 5 AAAA 2600:9000:5306:c900:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0