Malicious PDF — malware analysis report

Static analysis result for SHA-256 4251ffe5f29799bd…

MALICIOUS

PDF

96.3 KB Created: 2021-05-21 11:52:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 85d7a68166ffe6847d48054fdb4fcde8 SHA-1: 12c926e93448ac9971300fd06541aea2b7510cf6 SHA-256: 4251ffe5f29799bd6cc6f2853c96968d5208ccec27071a23aa725bb6d522a2d6
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://mezovuduw.ru/strik?utm_term=fatih+harbiye+karakter+analizi PDF link annotation
    • https://zoludapi.weebly.com/uploads/1/3/4/5/134528767/6466113.pdfIn PDF document text
    • https://vusutiti.weebly.com/uploads/1/3/4/7/134762674/6754970.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377371/normal_5fd0e568d4fd7.pdfIn PDF document text
    • https://fogufufizanalu.weebly.com/uploads/1/3/0/8/130813948/gekotomikivo.pdfIn PDF document text
    • https://pitudonela.weebly.com/uploads/1/3/5/3/135323021/9214295.pdfIn PDF document text
    • https://nivagevap.weebly.com/uploads/1/3/1/4/131438423/runul_pogisex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451574/normal_600c014404cab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455673/normal_605201ffec99c.pdfIn PDF document text
    • https://muborite.weebly.com/uploads/1/3/4/4/134442605/0f8cb63820509.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451766/normal_5fceba6741e86.pdfIn PDF document text
    • https://bopewoxal.weebly.com/uploads/1/3/5/2/135296364/betudeziliviw.pdfIn PDF document text
    • https://xikoroto.weebly.com/uploads/1/3/4/3/134338579/557595.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdca8b3c-f592-4484-867d-5939ad68de17/18564233401.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fc9bcb6-c9b2-4c30-8a86-e4dd1bffe3d0/what_is_the_narrative_structure_of_frankenstein.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/203a984a-302c-4e03-b2b2-d8dd9852652f/6904876361.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/739e4e43-0b8b-495c-adfa-5f812d16623f/kuxelaxuso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb2e0b8e-3ac7-4b0c-bb6f-ceb6381913b8/9383541508.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e4dfdf4-c8c2-43d7-b96b-3e25c116c755/how_to_put_a_bowflex_together.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ffc7a31-64d6-4a40-9ac9-785551158b97/el_libro_de_los_secretos_pelicula_completa_en_espaol_latino_mega.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eccb8267-85b0-41a2-8a7f-9c484d9f0bed/xabefetotusakesasu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bb38948-4690-4c5d-9682-b75434ecb0e0/asus_z170_deluxe_error_code_55.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55ab8d00-1549-461a-b094-19399014179c/mobofupotinafib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9bda46c-43c9-4c40-8d73-5cdd7c6c0c7e/zukevurepakerudivatigo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62b120e6-68d8-4721-ae99-1b13adc844d4/best_defense_lawyers_in_melbourne.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f92c1533-ee3e-45da-8161-f9787432f2d1/what_was_mesopotamia_famous_for.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c8557ca-2aa0-471a-84ff-333a5964ccf5/68273208511.pdfIn 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_off00013965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13965 4908 bytes
SHA-256: 84f4943d4f6f64e171573917fa67bca30ad90da999e8c4bac57e27f274948d21
font_01_sfnt_off00014a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A23 13120 bytes
SHA-256: c85344f2f0fd5689294f87d91cfdf81b7cc25ee4adadbe2cc37d852fc6c6af62

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