Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef6b92458202b3b1…

MALICIOUS

PDF

89.1 KB Created: 2021-03-28 12:01:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 8580e9b63177641cb6c5f3a8477d2f3f SHA-1: 48ca48085bf70e50b94ac16691c92c4bd85d3acd SHA-256: ef6b92458202b3b1af6e3c4ecf2680171c3f7dcb70d3fa98a8d8ece86ed8be1d
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, identified as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or SEO spam. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://leonvi.ru/award?keyword=amenaza+parto+pretermino+pdf+2020 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4393759/normal_5fc6d4f7364a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444850/normal_604bbcfa591ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420430/normal_5fd19bbf0b731.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421360/normal_60282ef485d23.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377662/normal_60040c3c8c50a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480414/normal_6039a35838d1f.pdfIn PDF document text
    • http://wegutamozeji.iblogger.org/basetes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d525ee04-2a40-494f-8ba9-fee52f7b18ee.filesusr.com/ugd/8b8e24_0b4d780cd9b84415b230bb688dc97ea2.pdf?index=trueIn PDF document text
    • https://5be7aec3-7d66-433b-ae1d-2bfb807ddf2a.filesusr.com/ugd/24deb6_4e0a1a17ae59407c8dee0d63efe0c5fb.pdf?index=trueIn PDF document text
    • http://miloxagiwe.epizy.com/baptist_hymnal_songs_instrumental.pdfIn PDF document text
    • http://lajuloverebob.epizy.com/samsung_vcr_to_dvd_recorder_manual.pdfIn PDF document text
    • http://rifedemukipozo.rf.gd/37537481299.pdfIn PDF document text
    • https://8d5bcf17-53f2-4f21-b585-7a27aef14131.filesusr.com/ugd/7baf93_b4bce369a8c04da182591d11497356c9.pdf?index=trueIn PDF document text
    • http://kixurazo.rf.gd/breakdown_sheet_music_guitar.pdfIn PDF document text
    • http://babotos.epizy.com/verbal_reasoning_test_practice_questions_and_answers.pdfIn PDF document text
    • http://jerolap.rf.gd/dharmayoddha_kalki_avatar_of_vishnu_free_download.pdfIn PDF document text
    • http://rifovedukuj.epizy.com/death_parade_op_piano_sheet.pdfIn PDF document text
    • http://didosides.rf.gd/why_are_my_keyboard_lights_not_working_lenovo.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_off00011bcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCF 5288 bytes
SHA-256: 47a0909862f88a9cadb40e30c7abb42cf55a8b81ab14b9f895493e839630544b
font_01_sfnt_off00012dc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC0 12384 bytes
SHA-256: c5fd0b2147008a75ce2947de604b270c21206c51541e98e098e59aad144ebdfc

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