Is Ecclesiastes a book of negative wisdom?

There are two books of the "Son of David": Ec 1:1 ¶ The words of the Preacher, the son of David, king in Jerusalem. Mt 1:1 ¶ The book of the generation [record] of Jesus Christ, the son of David, the son of Abraham.

The first book is the earthly wisdom that Solomon gained and speaks of the kingdom of this world. The second book is heavenly wisdom and speaks of the kingdom of heaven.

Though Solomon was the wisest man on earth...

(1Ki 10:23 So king Solomon exceeded all the kings of the earth for riches and for wisdom.)

...he was the veriest fool in the kingdom because he did not obey God.

De 17:16 But he shall not multiply horses to himself, nor cause the people to return to Egypt, to the end that he should multiply horses: forasmuch as the LORD hath said unto you, Ye shall henceforth return no more that way.

His multiplicity of wives brought foreign gods into Israel.

Ps 111:10 The fear of the LORD [is] the beginning of wisdom: a good understanding have all they that do [his commandments]: his praise endureth for ever.

The simplest child who obeys God is wiser than Solomon.