Malicious PDF — malware analysis report

Static analysis result for SHA-256 931d3c8b540e08fb…

MALICIOUS

PDF

84.7 KB Created: 2021-04-05 12:55:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a3ea50745efb78bd005e351d11452a2e SHA-1: dd1ffc5d6e51528071494ecd84ee25f3424879f4 SHA-256: 931d3c8b540e08fb7b6ef48675d009d76cffa325a05888371e2fc80da057488d
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://jacksth.ru/wix?keyword=la+luna+sangre+july+11+2018 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4474980/normal_60258fc3b6e1a.pdfIn PDF document text
    • http://wemorewabadeluz.mygamesonline.org/administracion_publica_argentina.pdfIn PDF document text
    • http://wotedogupowu.sportsontheweb.net/technology_acceptance_model_questionnaire.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419851/normal_5fc7f3b78cb8f.pdfIn PDF document text
    • https://cdn.sqhk.co/gejupajo/cpge7ja/purewabu.pdfIn PDF document text
    • https://cdn.sqhk.co/menigopas/jjSjfii/xbox_series_x_price_leak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426423/normal_60524190eb73a.pdfIn PDF document text
    • https://cdn.sqhk.co/mogudekusab/cRheagj/44819896900.pdfIn PDF document text
    • http://midakurapujif.mypressonline.com/gitudodutego.pdfIn PDF document text
    • http://sizinepizot.scienceontheweb.net/biostatistics_questions_and_solutions.pdfIn PDF document text
    • https://cdn.sqhk.co/jigugabopu/en1a2Dv/kusinapevutazojuxefoniti.pdfIn PDF document text
    • http://mikazuxo.mypressonline.com/jedijaxokabuxekovinumavut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464080/normal_60641cd46d934.pdfIn PDF document text
    • http://kozugufasuroti.mygamesonline.org/business_name_registration_form.pdfIn PDF document text
    • https://cdn.sqhk.co/mowanideju/cHhijjI/arenanet_promo_code.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9eaa565e-fb97-40b4-b096-d6760803f699.filesusr.com/ugd/55e2c6_13d69340b81846ac8e00d622c3a2e6dd.pdf?index=trueIn PDF document text
    • http://bujetazufukuv.rf.gd/wosonokexesefiriputugo.pdfIn PDF document text
    • http://zasuwunal.myartsonline.com/performance_appraisal_form_download.pdfIn PDF document text
    • http://riveminigokoxa.myartsonline.com/fake_blood_cancer_report_download.pdfIn PDF document text
    • http://gagutaxu.rf.gd/bestie_camera_app_free.pdfIn PDF document text
    • https://74269c25-1731-4359-90d4-804f54ef9c1c.filesusr.com/ugd/b5973a_845aff50786445feb80e89cdd8ce3e87.pdf?index=trueIn PDF document text
    • https://d56a38bf-d62e-453c-9b5b-5b2fe88aea46.filesusr.com/ugd/359e64_be70ff7358fc41b1875ecd8209dbf6cd.pdf?index=trueIn PDF document text
    • http://limuzer.atwebpages.com/82392819640.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_off000109c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C3 5492 bytes
SHA-256: f1dc407b77564ededa6df0c9edb3ac5baaf97f52b0076e9418d775d39b5469ba
font_01_sfnt_off00011c8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8C 11912 bytes
SHA-256: 2728f618fcbd028ef3dc58cf0064a5bf366552be2d311a70a881a4f03dc5c1c2

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