Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f8c2f9113600097…

MALICIOUS

PDF

67.7 KB Created: 2021-03-28 02:55:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 2b898fb828c432a37959b83582168c46 SHA-1: 190eb8fe6825f7d43de8766e4558ea7f84323bfa SHA-256: 6f8c2f91136000970a2c7676368cbeddde2263e9dede8a23bb5b09e73c5d794a
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution attempt, likely leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/wix?keyword=1v1.lol+unblocked+66 PDF link annotation
    • http://naturalgood.space/calculus_stewart_8e1gk5m.pdfIn PDF document text
    • https://losewilim.weebly.com/uploads/1/3/4/8/134854933/482224.pdfIn PDF document text
    • http://kvyovk.xyz/2010_chevy_malibu_ltz_power_steering_pump0c397.pdfIn PDF document text
    • http://fegivate.medianewsonline.com/69514591758.pdfIn PDF document text
    • http://naturfresh.fun/39745007226st32b.pdfIn PDF document text
    • https://tekoxinir.weebly.com/uploads/1/3/4/6/134606092/bilakuka-jegimuwe-garalifufa.pdfIn PDF document text
    • http://lnstagramoriginal.com/robbins_pathology_10th_edition_release_datev081c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366035/normal_6006655e21835.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461216/normal_6054ffd38f53a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://788ae96d-7a4f-4726-91a9-07bb742fb3e7.filesusr.com/ugd/97aff7_edfc127d1e244acabe6c6e46ea690ff4.pdf?index=trueIn PDF document text
    • https://8d5bcf17-53f2-4f21-b585-7a27aef14131.filesusr.com/ugd/7baf93_f79dd1b4e61145269e81f18dfe1d3205.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1373ee70-8dad-494c-ae0b-16f7bf2416db/land_rover_discovery_2_off_road_build.pdfIn PDF document text
    • http://jezevenakos.myartsonline.com/tan_application_form_49b_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ede2f8dd-eae7-4ed7-a915-a722bc5c7c54/nyu_langone_health_pension_service_center.pdfIn PDF document text
    • http://seroroxunabolu.onlinewebshop.net/rabirekara.pdfIn PDF document text
    • https://7ed754b6-a209-4558-9281-0032c7ee8ade.filesusr.com/ugd/4329d7_25e9937f8b7d4eafa69e60e950ccb8de.pdf?index=trueIn 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_off0000d01c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD01C 4856 bytes
SHA-256: c43cb977ac193a7d7e31f0ba346ae5f6b780dd32aec21a8febfead0e3e9cb3ff
font_01_sfnt_off0000e0c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C3 9812 bytes
SHA-256: 025412db21991b29ea731509e0cce44f1a21c0435a3817d60c7f412682d60bec

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