Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0288f42665bb791…

MALICIOUS

PDF

80.2 KB Created: 2020-11-06 06:01:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 55a82d76a96bb2042d57613182b78d3f SHA-1: b8b78cb10ed801ae538976497ab72a4b4360db38 SHA-256: d0288f42665bb79170e2079aafd71e703f61335da01bd839709b8df26cc47d32
126 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many pointing to disposable hosting services, indicating it is part of a link farm designed for SEO manipulation. The primary URL, https://trafffi.ru/strik?keyword=go+math+grade+4+chapter+5+page+283, is presented as a search result for educational content, likely to trick users into visiting malicious sites. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • 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://trafffi.ru/strik?keyword=go+math+grade+4+chapter+5+page+283 PDF link annotation
    • https://vozomazusow.weebly.com/uploads/1/3/4/5/134510153/5677697.pdfIn PDF document text
    • https://jubunukaf.weebly.com/uploads/1/3/1/4/131483214/fajufesovefiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413362/normal_5f9d658bb5f85.pdfIn PDF document text
    • https://jonozexogu.weebly.com/uploads/1/3/4/3/134357932/5566132.pdfIn PDF document text
    • https://vakesefujes.weebly.com/uploads/1/3/0/7/130739027/ed301fc90ce0.pdfIn PDF document text
    • https://pujuferot.weebly.com/uploads/1/3/4/6/134657525/riberagewot_lepapuseworepek_tirupim_bedagubosozew.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/e42bca33-901d-43c7-9b13-1cc48d1a7e32/eker_elektrii_iletir_mi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0de7150c-a304-4ed7-a964-9f3272e7ec23/descargar_pokemon_mundo_misterioso_e.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bda70001-e3c2-492f-9e11-6211b46f9af9/3770635609.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/114960db-66d5-4cd4-8af6-77f130966da2/soil_worksheet_third_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05975586-a056-48e4-8401-9fd60ef9544f/85759624493.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/474b3643-bbdc-4e09-ba38-1257c51facf7/wavivuboko.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/35213731911.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/livros_dos_espiritos_allan_kardec.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_off0000f6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FD 6008 bytes
SHA-256: 41c2fec7fe6bdd2edef4c4b72bc4902a0f5757aad9a7f68123bc9c66201bab78
font_01_sfnt_off00010b56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B56 12024 bytes
SHA-256: e32e54e41c82480ffcae78defe768c7b0312933f43526f55616b709bc329dc1d

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