Malicious PDF — malware analysis report

Static analysis result for SHA-256 6620a35adc0f6c9b…

MALICIOUS

PDF

85.9 KB Created: 2021-06-02 19:12:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 576dd8eddb8661b9a2687e4d91d59457 SHA-1: 765c73d36f69a0567538bc413b89b816742c5e6b SHA-256: 6620a35adc0f6c9b8f44b12b875c1e2b49beb48367685be75bd7b61058b4bbb1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a link farm with numerous external URLs, including one pointing to 'kuzutuzo.ru', suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains metadata related to 'Android tv box nvidia shield pro', likely a lure to attract victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://kuzutuzo.ru/123?utm_term=android+tv+box+nvidia+shield+pro
    • https://static.s123-cdn-static-d.com/uploads/4418788/normal_60b09069ed8b6.pdf
    • https://static.s123-cdn-static.com/uploads/4393779/normal_5fcd3e0cb3fd1.pdf
    • https://static.s123-cdn-static.com/uploads/4488323/normal_5ff5af8c5bbf0.pdf
    • https://static.s123-cdn-static.com/uploads/4471686/normal_5fedd658b28be.pdf
    • https://kovozewiridudu.weebly.com/uploads/1/3/0/7/130738567/9479327.pdf
    • https://newavutija.weebly.com/uploads/1/3/1/8/131871734/xokivex_numukid_gurasi_vetejekovusipu.pdf
    • https://static.s123-cdn-static.com/uploads/4475215/normal_5fdd22b8a9d03.pdf
    • https://gevupuwelado.weebly.com/uploads/1/3/4/8/134894118/zilebeguw.pdf
    • https://static.s123-cdn-static.com/uploads/4495395/normal_6003b3e0abbd4.pdf
    • https://kozitasulama.weebly.com/uploads/1/3/4/6/134647404/4561019.pdf
    • https://ruwufinojib.weebly.com/uploads/1/3/4/6/134643146/sowimuxuxu_vatedowigiwik_xiras_wetoritoxupakar.pdf
    • https://static.s123-cdn-static.com/uploads/4426813/normal_6000b0dae80ab.pdf
    • https://cdn-cms.f-static.net/uploads/4446400/normal_5fda807d9c1d1.pdf
    • https://wofixoxabovu.weebly.com/uploads/1/3/4/5/134524794/5653780.pdf
    • https://nefupoxuwuridek.weebly.com/uploads/1/3/4/7/134747690/3546870.pdf
    • https://cdn-cms.f-static.net/uploads/4421042/normal_600bcf21471ee.pdf
    • https://pukadove.weebly.com/uploads/1/3/4/6/134694451/8160225.pdf
    • https://cdn-cms.f-static.net/uploads/4497079/normal_5fe665482d35a.pdf
    • https://static.s123-cdn-static.com/uploads/4420018/normal_6000f62c8437d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8281ecc6-a639-441d-bd9c-d9a91f7c5b81/fulotikekejareripewow.pdf
    • https://uploads.strikinglycdn.com/files/5527c89c-0a39-4f7c-9d00-9bc6c72aa4c1/21924544790.pdf
    • https://uploads.strikinglycdn.com/files/a893f6ca-5a70-4a2a-b1b5-84134c0fa84b/pakosuwawilawavez.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9b4.bin
7a696a0a7337861f027637193edc7164c74dd92bf17d169cfa4af81771fc8f86		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B4 5304 bytes
font_01_sfnt_off00010bbc.bin
4f46446266f0aef680e404a06266098c9579c7da365fca8ff4c7830c2e11c036		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBC 12344 bytes
font_02_sfnt_off0001345e.bin
31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1345E 16204 bytes

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