<?php if(!empty($product->get_attribute('brand'))){ ?>
	<div class="brand">
	<b>Бренд:</b> <a href="<?php echo echo $_attribute->getProductAttribute()->getAttributeCode(); ?>"> <?php global $product;
	echo $product->get_attribute('brand'); ?> </a> 
	</div>
<?php } ?>

On the page element is displayed here https://yadi.sk/i/70lBQXO37_RN6A but dont have clickable link

Have you considered using a plugin like WooCommerce Brands? It adds a clickable link to the brand’s page:

Link to image: https://snipboard.io/2jrQOn.jpg

If you prefer to do this programmatically, I can also recommend the following places for more development-oriented questions:

WooCommerce Slack Community: https://woocommerce.com/community-slack/
WooCommerce Community on Facebook: https://www.facebook.com/groups/advanced.woocommerce/