Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0557b151b05a89d…

MALICIOUS

PDF

77.4 KB Created: 2021-03-13 13:31:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7d64c2b78705c36e6d6da7330fcf7ae7 SHA-1: 89ea7b08c9a34112ec158ea00430c6550b9e1630 SHA-256: c0557b151b05a89df6017c760eb9c074cfb5ec95d8fe0b127be721e47b0c0185
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, containing numerous external links to disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for SEO spam or phishing. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/wb?keyword=how%20to%20fill%20a%20hoover%20steam%20cleaner PDF link annotation
    • https://ziluxokoker.weebly.com/uploads/1/3/4/3/134392919/9294898.pdfIn PDF document text
    • http://wawimetuboze.iblogger.org/kundalini_yoga_in_malayalam.pdfIn PDF document text
    • http://piruzinomezobif.22web.org/18741007209.pdfIn PDF document text
    • http://lapitubemexidi.mywebcommunity.org/witelonula.pdfIn PDF document text
    • https://pasetesosetoje.weebly.com/uploads/1/3/0/7/130775590/3389847.pdfIn PDF document text
    • http://logorag.22web.org/fofekilalumelikejonojete.pdfIn PDF document text
    • https://kifikutomile.weebly.com/uploads/1/3/0/7/130776046/gopus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fufudaloxola.onlinewebshop.net/how_to_factory_reset_kindle_keyboard.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76dce96d-b6b6-4a91-9ac1-670a18531b68/ruvibepuveralirusom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33957a23-504d-4f6a-8dfb-9488a930cd60/lumujo.pdfIn PDF document text
    • http://nabenejajoko.myartsonline.com/defiguzopifosejuvalekado.pdfIn PDF document text
    • http://jewezoku.epizy.com/how_to_increase_boiler_efficiency.pdfIn PDF document text
    • http://vudazirukileri.epizy.com/58505077591.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7a4c381-1925-455d-a24a-ffe1a7ec6e2d/sumomoxuwoditesiregivarik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed6df1ab-ee00-4277-a05a-6d4c9c53ea05/41682279411.pdfIn PDF document text
    • http://rebokomixuxoj.epizy.com/19622504425.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b93ba90f-e602-4703-bfb3-968f868a11fa/mapegugonajukadenineme.pdfIn PDF document text
    • http://refewebol.epizy.com/gosoxukiladiri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a5f5db0-eb14-4044-9e62-1c064410249d/how_to_be_a_graphic_designer_without_losing_your_soul_review.pdfIn PDF document text
    • http://gijafusatuvaxoj.rf.gd/reduxam.pdfIn PDF document text
    • http://fixidil.atwebpages.com/pdf_split_merge_free_download_full_version.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_off0000efe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE7 5236 bytes
SHA-256: 59162a3a0a9d6ee6525b16b9622cb76b73f4bca05e99455d4f616966e0479410
font_01_sfnt_off000101a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A0 11304 bytes
SHA-256: a3c50b6e4829a3b0c69fd4b4a0a2314b360643ef26424e7ef09a8a56b17c033a

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