Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c87dc542b3929c8…

MALICIOUS

PDF

77.7 KB Created: 2021-03-27 09:50:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4a7333b834cfc0e660c5b6a7b9595ecf SHA-1: 2438c9c98a6f550d060c5d0e16654bf1c8a1a886 SHA-256: 6c87dc542b3929c83ec81709edcbc3f34b827b4525b3d2a56c7928e39f618553
186 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as search results, with one prominent URL leading to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the PDF structure and embedded URLs suggest it's part of a broader campaign to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://kuzutuzo.ru/strik?utm_term=how+do+i+change+my+sentry+safe+code PDF link annotation
    • https://cdn.sqhk.co/remowiwa/fihidbL/42257405126.pdfIn PDF document text
    • https://cdn.sqhk.co/fefowofuk/khghaJh/21477964146.pdfIn PDF document text
    • https://mufiguxibetifo.weebly.com/uploads/1/3/1/6/131607440/8224362.pdfIn PDF document text
    • http://jegajebisukagur.22web.org/61771274486.pdfIn PDF document text
    • http://bemijaragilez.22web.org/my_hero_foo_fighters_piano_sheet_music.pdfIn PDF document text
    • https://manumuxalobo.weebly.com/uploads/1/3/5/3/135387638/5970212.pdfIn PDF document text
    • http://monufovaxuj.66ghz.com/42665128750.pdfIn PDF document text
    • https://cdn.sqhk.co/bujugasefoli/fyEiaRB/63464698453.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f4ef19d8-372f-49db-bbb6-0f5e16bfa625.filesusr.com/ugd/070799_56a9e79e5a424db6bc6565054b9fd341.pdf?index=trueIn PDF document text
    • http://tujatubaniza.epizy.com/purposes_of_technical_report_writing.pdfIn PDF document text
    • https://3c3b6f52-20a2-448a-be11-eec5930c502f.filesusr.com/ugd/0ca786_85baf37d34854630885092610180d077.pdf?index=trueIn PDF document text
    • http://gizadopozi.epizy.com/como_clasificar_una_cuenta_en_contabilidad.pdfIn PDF document text
    • https://f904ef53-caa1-4f0f-8a97-c50675c03ece.filesusr.com/ugd/2f8cea_eec81198c83e44de90c9c0a83fa04ef7.pdf?index=trueIn PDF document text
    • https://814cba0f-f649-4223-bfe6-7884e6e02b9d.filesusr.com/ugd/c1108c_aa8cc7f8667f434b81957a9af83aa743.pdf?index=trueIn PDF document text
    • https://69c5641f-197a-42c1-bef1-daa502c1f1d7.filesusr.com/ugd/948cea_21c1e6dbe0b14ef7b9911e0e9d7e6d2f.pdf?index=trueIn PDF document text
    • https://c140f178-ee45-427e-91fe-a3c5f821f67e.filesusr.com/ugd/ebc5f9_0476605f7f8749ea92bed815c10f7926.pdf?index=trueIn PDF document text
    • https://39ad70c8-6a03-4de2-a89b-b0209cba5754.filesusr.com/ugd/d2759c_6d20d1e5a9bf4fbeae75f03e024a7b6f.pdf?index=trueIn PDF document text
    • http://fatufad.rf.gd/microsoft_az_100.pdfIn PDF document text
    • https://6b9ff03a-ef48-417a-a14c-919df0f903d0.filesusr.com/ugd/f459ea_f9bc5c675fa345b6b7cf0e42424f2a9e.pdf?index=trueIn PDF document text
    • http://mikesivu.rf.gd/wusekezibanomijurude.pdfIn PDF document text
    • http://siletafelit.epizy.com/subject_verb_agreement_worksheets_esl.pdfIn PDF document text
    • https://0315d410-4255-45a3-9477-873949dd02ac.filesusr.com/ugd/f85006_b6877e020cd84edab2071414650dce67.pdf?index=trueIn PDF document text
    • http://zugarig.epizy.com/circuit_analysis_basic_notes_free.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_off0000f0c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C1 5556 bytes
SHA-256: 33034c77af71ec8be8c7fb6f7c452896339da5ae6d940c0fd815ddd392a899a0
font_01_sfnt_off00010395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10395 11080 bytes
SHA-256: 62112e42960e0d668d13cfc9e9b9ecbb8b0e60d3da2b5f1fed17a2b54cae6b74

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