Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4f4fdadec4e4507…

MALICIOUS

PDF

78.5 KB Created: 2021-05-03 10:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 1d75599620b9e201f794aeca5dc8b4bb SHA-1: a451adff528263afa20c69f5e1594e04c435dffb SHA-256: f4f4fdadec4e450705372fae9a3936855a4d0222fb921230c3e1d5d09267559f
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is part of a network of disposable domains used for malicious purposes. The embedded URL 'https://kuzutuzo.ru/strik?utm_term=delonghi+toaster+oven+manual' indicates a lure to a potentially malicious site, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://kuzutuzo.ru/strik?utm_term=delonghi+toaster+oven+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481847/normal_6061dcd4e7288.pdfIn PDF document text
    • https://cdn.sqhk.co/pegidago/dijFiel/hocus_pocus_2_release_date_canada.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427526/normal_5feb4c48507e2.pdfIn PDF document text
    • http://firobazotu.sportsontheweb.net/cbse_class_12_commerce_syllabus_2020_20.pdfIn PDF document text
    • https://cdn.sqhk.co/levowexesu/j6hmaMT/64060304658.pdfIn PDF document text
    • http://filozajerezabi.getenjoyment.net/interactive_electrocardiography.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422150/normal_605566c54ed02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366384/normal_60311f0fa8bdd.pdfIn PDF document text
    • http://instasurprise.online/a_borboleta_azul_livroys0n6.pdfIn PDF document text
    • http://tezibif.mygamesonline.org/vexebadejuxelalowapup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477864/normal_60229b7b7e407.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463002/normal_603050accaeab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369905/normal_601e5f553e2a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501770/normal_6049327136b9b.pdfIn PDF document text
    • http://memaberenux.scienceontheweb.net/31812372734.pdfIn PDF document text
    • http://espacecmb.xyz/happy_clinic_colorado_springs1f13b.pdfIn PDF document text
    • http://kengoru.space/4620725370974o1q.pdfIn PDF document text
    • http://lopixerirerenex.mywebcommunity.org/nosetudoketefonagipag.pdfIn PDF document text
    • http://peludofnor.fun/rancilio_silvia_models58yk5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423195/normal_600614a782f87.pdfIn PDF document text
    • http://zinefikitozozeg.sportsontheweb.net/tvs_bolt_torque_chart.pdfIn PDF document text
    • http://mantenancie.com/que_hace_un_lider_espiritualeb4p2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jopubijako.atwebpages.com/discurso_de_benedicto_xvi_ratisbona.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_off0000f661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF661 5160 bytes
SHA-256: 3e671b31443032fa663d8449b4fdab8bd9dc194d3500141f0e159e32c12d5bfb
font_01_sfnt_off000107d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D1 10888 bytes
SHA-256: 306f29029ba8d8a062a65b417fd0f851f9d906be2956282a0aefce3825881318

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