Malicious PDF — malware analysis report

Static analysis result for SHA-256 0728dfc04bc32dc9…

MALICIOUS

PDF

76.9 KB Created: 2021-04-08 04:46:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 46be7aacd3cb869f2ff2767195050158 SHA-1: 5386feea518a3907a1cf3113ad176d4a89f29d55 SHA-256: 0728dfc04bc32dc9034b0f146e84be51810f995e82b1aa4ef3531c0889019221
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and 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 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xajibur.ru/strik?utm_term=what+age+group+is+my+book+for PDF link annotation
    • http://draiwenstore.online/how_to_do_naruto_hand_signs_slowii1az.pdfIn PDF document text
    • http://rumurel.mywebcommunity.org/enterprise_risk_management_thesis.pdfIn PDF document text
    • http://bumasujofoj.getenjoyment.net/employee_appraisal_template.pdfIn PDF document text
    • https://wugupuvexiso.weebly.com/uploads/1/3/0/9/130969254/4edac4ecb9c4.pdfIn PDF document text
    • http://vuvajujuli.mygamesonline.org/astm_e898_88.pdfIn PDF document text
    • https://nukoxola.weebly.com/uploads/1/3/1/3/131380146/6494237.pdfIn PDF document text
    • http://itawomen.fun/the_crucible_movie_worksheet_answersjsj7v.pdfIn PDF document text
    • http://pukebebizadolu.mypressonline.com/pdf_ergonomie_am_arbeitsplatz.pdfIn PDF document text
    • http://xefawojuj.mygamesonline.org/42456647245.pdfIn PDF document text
    • http://gifavojam.scienceontheweb.net/91033981147.pdfIn PDF document text
    • http://rupazaduxil.mywebcommunity.org/action_verbs_exercise.pdfIn PDF document text
    • https://lubikumak.weebly.com/uploads/1/3/1/4/131453733/8a0fd886.pdfIn PDF document text
    • http://jiwapadenejeza.getenjoyment.net/4178449892.pdfIn PDF document text
    • http://kajejib.medianewsonline.com/ecologia_y_gestion_ambiental.pdfIn PDF document text
    • http://masito.space/48054521805qhuzr.pdfIn PDF document text
    • https://fezugewibopav.weebly.com/uploads/1/3/5/3/135346468/48f15db17.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fozubada.rf.gd/97579056329.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcba8d62-2550-4f8a-abc6-83213be64c7a/lofesefalegaxupo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55300c8b-a02b-4843-bfd5-dd84cf2e46cd/best_stoic_quotes_of_all_time.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68f8c387-f3f8-45f2-ad64-061fef6c1108/59529058695.pdfIn PDF document text
    • http://nodefojabotozij.rf.gd/bettys_diagnose_episodenguide_staffel_4.pdfIn PDF document text
    • http://gafodix.myartsonline.com/marketing_information_system_components.pdfIn PDF document text
    • http://dusutokoj.epizy.com/40k_codex_download.pdfIn PDF document text
    • http://masasor.rf.gd/absa_personal_loan_application_form.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_off0000ec9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9F 5600 bytes
SHA-256: 771cfaf011b082b84f7d2d925805f77befe71df7aaf67677bb19dce61afc38fb
font_01_sfnt_off0000ff98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF98 11248 bytes
SHA-256: 8da7156ffc4ed0740dfca300d498a99f1282dfdb9013a9f986abd2a398b049f3

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