Malicious PDF — malware analysis report

Static analysis result for SHA-256 a82eda8476bda025…

MALICIOUS

PDF

77.3 KB Created: 2021-04-02 05:03:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 068bf47600573baeff2a6533b4b32752 SHA-1: 1500c57719244cb11014278e57e2c911b8033f09 SHA-256: a82eda8476bda02510d609d80c17cb43a4356d0d8a5632f76eec1e6693ae9712
186 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 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 0.9998

Heuristics 6

  • 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 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+to+reset+fisher+and+paykel+dishwasher+f1+error PDF link annotation
    • https://sidatugalelukad.weebly.com/uploads/1/3/4/6/134639108/597c262c1cc21.pdfIn PDF document text
    • http://sunugukumota.getenjoyment.net/how_to_perform_transcendental_meditation_free.pdfIn PDF document text
    • http://noxetoporobosek.sportsontheweb.net/26324136227.pdfIn PDF document text
    • http://vurujupafowutox.mypressonline.com/air_force_football_roster_2016.pdfIn PDF document text
    • https://voruvagozi.weebly.com/uploads/1/3/4/7/134742827/duvudunubekuvininep.pdfIn PDF document text
    • http://mavafesumej.medianewsonline.com/differential_calculus_maxima_and_minima_word_problems.pdfIn PDF document text
    • https://depatimuxuzox.weebly.com/uploads/1/3/4/4/134404048/ed44516fd486.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ab737b70-891a-4a1f-8db9-ee548211cb31.filesusr.com/ugd/ce14f3_060cec8798954038867b7eed88f67450.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/24fdeb68-d3b1-4fa1-821f-8007f631ee90/driver_interface_m_audio_fast_track_ultra_8r_power_supply.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/430228fc-991e-4cc8-b047-af3c3dfbfd14/how_to_collect_on_a_judgement_in_texas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ff6553a-3b0a-4795-97c4-f164678c19ec/how_much_are_online_photography_courses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/047d5027-82ff-47bb-b907-bba8063dffb5/86239951421.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25afeabb-17bd-4679-a340-bee75fba4cb1/badozajiperi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af5f0dcf-4cd5-4f52-aba9-5aab8b68e671/how_much_is_55_inch_samsung_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46764930-a43a-4589-8cbc-d97674b1cf10/aprendizajes_clave_lengua_extranjera_ingles_educacion_basica_respuestas.pdfIn PDF document text
    • https://s3.amazonaws.com/wizomoravazub/android_4._1_os_free_for_tablet.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/estimate_templates_excel.pdfIn PDF document text
    • http://liduvitulugug.onlinewebshop.net/mastering_bitcoin_andreas_antonopoulos.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_off0000f104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF104 5400 bytes
SHA-256: 43d5c937fa376aae4e9d2bccb3baf68589fdddc5648f128903b66e532adf0b80
font_01_sfnt_off00010378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10378 10780 bytes
SHA-256: 376b496fa92d10ba9cc04e76f91ec7082bfd668b8b74ada3daee37c51f6651e5

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