Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6ba10cbd7d747ce…

MALICIOUS

PDF

62.5 KB Created: 2020-12-27 21:07:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: f19693d9ac8087ba156d4a2033fbe862 SHA-1: 5117784fb0da7a3634fc99facf1f9e3004b2805a SHA-256: e6ba10cbd7d747ce35b8592a925566215c40bdf181967a6053809f6056bae35b
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It functions as a link farm, directing users to multiple external URLs, with a notable focus on disposable hosting and potentially malicious domains like trafffe.ru. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffe.ru/strik?utm_term=events+today+near+me+2020 PDF link annotation
    • https://zezevibowavaki.weebly.com/uploads/1/3/4/8/134854125/8974208.pdfIn PDF document text
    • https://cdn.sqhk.co/nevowokazem/aicnIhi/rabovesaxewizepu.pdfIn PDF document text
    • https://cdn.sqhk.co/tabawapizak/0ggwijj/22645114886.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446925/normal_5fbba78628298.pdfIn PDF document text
    • https://vosomomoratefuf.weebly.com/uploads/1/3/4/6/134614816/fb8b0f2d.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/zanazanekoxel.pdfIn PDF document text
    • https://koximewi.weebly.com/uploads/1/3/0/7/130775363/3294793.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481520/normal_5fe643aadd3c0.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/mazugezijap/computer_all_full_form_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2751f4d3-14b4-476e-858b-58d4bf3e8660/horror_vrchat_maps.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f62fa9b8-572c-441d-a583-6836b621e35e/algebra_nation_workbook_answer_key_section_6.pdfIn PDF document text
    • https://s3.amazonaws.com/sukedil/saaho_tamil_movie_hd_video_songs.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_off0000b826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB826 5332 bytes
SHA-256: f0a1d76b6742f4ebe9cae853c4a21c907c6087d667adcdc8b0dbe9993bdc6cfd
font_01_sfnt_off0000ca3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3C 10232 bytes
SHA-256: b28aed9cf057022b41441cb54be36df0ecfe188a459d67cccf33e4dfaf751b8e

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