Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fbba6c60df3f0b8…

MALICIOUS

PDF

79.7 KB Created: 2021-05-18 16:14:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ae13aa2561d204000fb805a57881be8 SHA-1: d3b73e3f6b00c07a26932db7ecb1a1acdcde45cf SHA-256: 3fbba6c60df3f0b8731c3b3412ae753d6ebf8cc55d23e7b073aa1e67080122cb
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a primary URL pointing to 'kuzutuzo.ru/strik', suggesting a phishing or malicious content delivery attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically classified as a phishing trojan. The document body, though heavily obfuscated, contains text related to 'toon blast para pc online', likely a lure to attract users to the malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/strik?utm_term=toon+blast+para+pc+online
    • https://cdn-cms.f-static.net/uploads/4495973/normal_5fe841b693e2f.pdf
    • https://bivofeneduwid.weebly.com/uploads/1/3/1/1/131163561/5b35c.pdf
    • https://cdn-cms.f-static.net/uploads/4446400/normal_5fe620c9f3b54.pdf
    • https://static.s123-cdn-static.com/uploads/4481675/normal_6006aa52f1484.pdf
    • https://finazevad.weebly.com/uploads/1/3/0/7/130739247/nepejiloxusavit-jagutupos.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/bopuxosavubare/jopijasepewovuretodufiv.pdf
    • https://uploads.strikinglycdn.com/files/65498083-cfb5-4da6-b60e-25b68c353e0b/67793562758.pdf
    • https://s3.amazonaws.com/nedijowewoded/solid_state_physics_book_by_kittel.pdf
    • https://uploads.strikinglycdn.com/files/8a0212d9-7088-4ef7-9d8c-ef20aa05b778/69004220531.pdf
    • https://s3.amazonaws.com/vuterijoze/lekoruzulotozalinexojomip.pdf
    • https://uploads.strikinglycdn.com/files/8a7ae75a-dfa7-48cd-b1f7-037c7a2ebafd/thrawn_trilogy_books.pdf
    • https://s3.amazonaws.com/jinabisura/alcohol_poisoning_treatment_guidelines.pdf
    • https://uploads.strikinglycdn.com/files/4ef8c236-c21a-49f4-ab3d-b3cd3b0daab9/fifty_shades_of_black_gefhrliche_liebe_trailer.pdf
    • https://uploads.strikinglycdn.com/files/e1fa2d06-1486-451b-b246-7cf3b720170e/sovolimizaridejimo.pdf
    • https://uploads.strikinglycdn.com/files/dbfcc219-d887-4392-8eca-5447f7fc547a/rizivep.pdf
    • https://uploads.strikinglycdn.com/files/6db28471-2a45-478c-94c7-eb0ae0dec045/best_minn_kota_trolling_motors.pdf
    • https://uploads.strikinglycdn.com/files/74d99c63-844b-4d4e-b0ed-e3e49db2ed09/86083663872.pdf
    • https://uploads.strikinglycdn.com/files/63eac512-8b44-45b7-b020-db78b9f9e65f/nivewibu.pdf
    • https://s3.amazonaws.com/ganubifirigevi/38401733438.pdf
    • https://s3.amazonaws.com/tinivukedeta/frizinghall_primary_school_ofsted_report.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efb0.bin
f965a02cb5442b426da69994de7f7bf38b5b4f19b2914efcc2d8e7525eba8dab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB0 4804 bytes
font_01_sfnt_off00010000.bin
3a16885fac43b1dbe332da5fc60defc92e8dca0de98b7a196fe57fe6d584b768		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10000 10616 bytes
font_02_sfnt_off000123c7.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123C7 4324 bytes

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