Malicious PDF — malware analysis report

Static analysis result for SHA-256 c36539eb4b8a329d…

MALICIOUS

PDF

96.4 KB Created: 2021-04-16 02:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b315da81d35a81486181f18a9626b7c1 SHA-1: 8932fc810a2742691f267635b924a9ee114423ef SHA-256: c36539eb4b8a329d047383df3db92e125ae5e9d5333c2349c464ccf02566035a
126 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://pelibifir.ru/strik?utm_term=picnic+shoulder+roast+oven PDF link annotation
    • http://tokexal.medianewsonline.com/biogeochemical_cycle_diagram.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474746/normal_6049aa8dd5ef9.pdfIn PDF document text
    • http://glasshookahcatering.com/18381533219h0lf6.pdfIn PDF document text
    • http://vozivovog.scienceontheweb.net/ccna_routing_and_switching_complete_study_guide_download.pdfIn PDF document text
    • http://milansit.space/jezunz0u6n.pdfIn PDF document text
    • http://stepka2016.xyz/hoover_windtunnel_vacuum_bags_type_qogywz.pdfIn PDF document text
    • http://kedepoba.sportsontheweb.net/ankle_sprain_management.pdfIn PDF document text
    • http://ig-support-service.com/foxafuwaf1bps.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405652/normal_602b3936dbf70.pdfIn PDF document text
    • http://nonretloli.site/what_happened_in_attack_on_titan_season_36cveh.pdfIn PDF document text
    • http://allerlo.xyz/luwojevej4d4.pdfIn PDF document text
    • https://kelebewo.weebly.com/uploads/1/3/4/3/134359650/a352eb8138b9a8.pdfIn PDF document text
    • https://kemolarutu.weebly.com/uploads/1/3/4/6/134685450/5782566.pdfIn PDF document text
    • http://ccckkkkk.space/lumen_histology_guidenybqi.pdfIn PDF document text
    • http://lemakomude.sportsontheweb.net/automatic_car_parking_system_project.pdfIn PDF document text
    • http://devgame.design/73372680979goxws.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378175/normal_6063be83819ed.pdfIn PDF document text
    • http://nubolats.xyz/11614976601dhmnc.pdfIn PDF document text
    • http://magexaxajatadog.getenjoyment.net/international_english_language_testing_system_ielts.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tigewibejageju/21934831326.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/carlyle_saskatchewan_weather_report.pdfIn PDF document text
    • https://s3.amazonaws.com/bojafazes/cambridge_primary_checkpoint_past_papers_2013_answers.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB1 15396 bytes
SHA-256: e73715672fb850b32ccf1e1cf665b54e0beecddf3f14e8fdb5437ec9a228c36c
font_01_sfnt_off00012c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C08 4968 bytes
SHA-256: 080c3c3dd9a776d53cdee292c8db6eca02dc4be1f6333c5f42395565e2995e01
font_02_sfnt_off00013cdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CDD 11272 bytes
SHA-256: 3b8a34728189c5d913f48e302468ef846fadf58f5f718a3fc0aa97f6ae7b2c21
font_03_sfnt_off00016355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16355 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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