Malicious PDF — malware analysis report

Static analysis result for SHA-256 eac6bbd6b8c11664…

MALICIOUS

PDF

38.3 KB Created: 2020-11-07 22:12:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 87134e206aff319ea97f29870c72b5b2 SHA-1: 1aaabceb103541b0919d6186d533a37fb11aff55 SHA-256: eac6bbd6b8c11664267e1c6599b57ac4aaba79d4a84c11823d07dc287e6f58a9
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains embedded URLs, with one prominently featured in the document body and heuristics indicating it's part of a link farm. The ML classifier strongly flagged this PDF as malicious. The presence of a URL that appears to be a search result lure suggests a phishing attempt, likely delivered as an attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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/aws?keyword=wilshire+park+needham PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4401518/normal_5f931e5b05e8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385434/normal_5f9b79e36207b.pdfIn PDF document text
    • https://japosazononugad.weebly.com/uploads/1/3/4/5/134583509/635f2356da67ba5.pdfIn PDF document text
    • https://rawekawus.weebly.com/uploads/1/3/4/4/134467784/jumasukepatum-gevow.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/punurum/computer_organization_and_design_the_hardware_software_interface_risc-v_edition.pdfIn PDF document text
    • https://sosomaper.files.wordpress.com/2020/11/71075369121.pdfIn PDF document text
    • https://dudasituwet.files.wordpress.com/2020/11/82514923658.pdfIn PDF document text
    • https://juvibix.files.wordpress.com/2020/11/gabizagamumarokidatanum.pdfIn PDF document text
    • https://wozexot.files.wordpress.com/2020/11/carousel_melanie_martinez_piano_sheet_music.pdfIn PDF document text
    • https://zefepured.files.wordpress.com/2020/11/the_wonder_weeks_milestone_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04f434ab-1d66-45ea-a612-281cd79fb667/56630251631.pdfIn PDF document text
    • https://sebuwisawos.files.wordpress.com/2020/11/fipupojuretis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4afd4c22-4013-4d0b-a633-81114bac3ce1/xifokovefalinafaxekux.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_off00005639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5639 5276 bytes
SHA-256: dd4061e87bee7c9a4db450fa170e03b454054a5300b45230fa236babc360eb92
font_01_sfnt_off00006803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6803 10968 bytes
SHA-256: 0b7dc0f4b0f31005a2bcff6d859ca5c964f5b505050417e891bfbba2a43d43d0

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