Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b63ec6adc41aaea…

MALICIOUS

PDF

77.0 KB Created: 2021-03-07 08:19:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: bb6ee5d06346e59c21651e7d8f0fc262 SHA-1: da4460f4820f5ff81236d00efeb1cf8e10d1e8de SHA-256: 2b63ec6adc41aaea9544568e9d189878b2d923d8b0f460063f50ddcdfe6fa793
186 Risk Score

Malware Insights

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

This PDF file contains a mass external link farm, with numerous URLs pointing to other PDF documents, likely for SEO manipulation or to host malicious content. The primary URL, 'https://kuzutuzo.ru/strik?utm_term=what+is+the+queen+of+heaven+spirit', suggests a lure related to spiritual queries to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=what+is+the+queen+of+heaven+spirit PDF link annotation
    • http://test123test.xyz/excell_xr2600_pressure_washer_troubleshootingi6drg.pdfIn PDF document text
    • http://vostokzapad.su/what_is_the_future_of_uspsbioyk.pdfIn PDF document text
    • http://idealicaufficiale.website/11899784987gj5dj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/divexikav/intermolecular_forces_activity_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a71775a7-b5bf-42bc-9cc7-5dd5d2fc233b/nimegutozudoruze.pdfIn PDF document text
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_755feaacee99448d931cf47a3de240b4.pdf?index=trueIn PDF document text
    • https://70010cfe-69b1-4fe9-a336-bdfe2418dc1e.filesusr.com/ugd/f1d680_9a8547b127ce4c2a87e2695e5c597a9b.pdf?index=trueIn PDF document text
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_f9d5ef99fcab4bc1b51efa9e00b7ce70.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1649d15e-0e10-4bc4-963b-26f9037bb530/nizibumadilofoxobed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12cf5096-e0d1-4ba0-a691-bc36211d575e/lefobekupivadevupom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73fe45c7-d5f0-4f5c-bb0a-07cc7e3b5a38/a_night_to_remember_book_sparknotes.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/how_to_formulate_research_questions_and_objectives.pdfIn PDF document text
    • https://2f60c0de-bae8-48d8-8f3f-ce7907f87c52.filesusr.com/ugd/badafb_8ab14267ce4e4a009c95cac6e9325e78.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a56cb0b2-5f18-4423-a7fa-98be22dea79a/8995900947.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6305f853-6bd9-44ac-8592-25f8a0af126c/98688066937.pdfIn PDF document text
    • https://9d1e48ad-bcd7-4831-9b7b-7108443a63b6.filesusr.com/ugd/136d07_4fdee444fc1d402abb8e8658c639e3cd.pdf?index=trueIn PDF document text
    • https://df256b98-640c-444d-885a-8195c7360722.filesusr.com/ugd/40b9e6_bd13abe3f7744562afae5bf66fafdf23.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jipowumat/wujewanenesifuzog.pdfIn PDF document text
    • https://c1d61d78-9bae-425c-b347-ee91470fe4f1.filesusr.com/ugd/60933b_60da30b5490742bf94acbcb5d081b617.pdf?index=trueIn PDF document text
    • https://3fb740b9-71d8-4183-8edb-de11b68c0a29.filesusr.com/ugd/1fbf8b_5b8cef8f28e64dedb4fe844b84a9ea22.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF176 5156 bytes
SHA-256: ba6334ffa47e8a2775513f386271eb31b8d7bbeec928434190d78bd314f8fd04
font_01_sfnt_off00010317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10317 10768 bytes
SHA-256: 3b7f5fb6464a2582d3416ed9e3c99dcae3fd69aa1d10cc98f5fb6b1031a4924c