Malicious PDF — malware analysis report

Static analysis result for SHA-256 e91e96a7bbb1e423…

MALICIOUS

PDF

77.4 KB Created: 2021-03-15 10:51:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6867dfb6c21d2f6ae7a2dbda374ae60a SHA-1: 1323db8b4e0d6aeeab1703de88996ff45b2fae02 SHA-256: e91e96a7bbb1e42394435926358b358425f2978e71860168fd033d547a96bacb
66 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 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 4

  • 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://zajinet.ru/strik?utm_term=best+upright+stationary+bike+for+home PDF link annotation
    • http://moxegelubopidi.sportsontheweb.net/bidirectional_visitor_counter_using_arduino_report.pdfIn PDF document text
    • http://d2-club.ru/12040935986jvn03.pdfIn PDF document text
    • http://insurancesouk.com/how_big_is_the_average_male_arm_size7fhn3.pdfIn PDF document text
    • http://lowabunuzoxa.getenjoyment.net/v_for_vendetta_book_review.pdfIn PDF document text
    • http://airned.ru/should_we_pray_to_diegoeqz3w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408712/normal_604b4ba5c0572.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369930/normal_5fdf77a3d6af6.pdfIn PDF document text
    • http://leafester.online/fugue_g_minor_bach_sheet_musicb5bte.pdfIn PDF document text
    • http://pupunorip.getenjoyment.net/migav.pdfIn PDF document text
    • http://ideaita.fun/xutodepixawadilof2418.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec2521d6-cd55-40b5-9403-64587fe1f45c/buwasizudigoguderavenufuv.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/peer_gynt_morning_mood_violin_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42e86e98-7fac-4338-9979-d12247dc39db/lista_de_los_derechos_humanos_universales.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8558fe1f-445c-4a00-831f-ed2bad1e3b46/pudarezobolimemasexa.pdfIn PDF document text
    • https://s3.amazonaws.com/gogoxowiniza/2347165214.pdfIn PDF document text
    • http://livirava.atwebpages.com/xonorosawiwo.pdfIn PDF document text
    • https://s3.amazonaws.com/zisulamisozoto/fapusevebujobefesebu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cacee57e-0070-4d3b-ab33-09568cca22fb/temperament_test_dog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af652188-3b91-4588-afba-678eedf60c41/flir_tg165_best_price.pdfIn PDF document text
    • http://sidepojedava.myartsonline.com/1066892336.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc391659-6219-420e-b450-26c180d53ebb/62025867004.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/891c8e19-2302-4661-8152-5311cebb1353/navien_npe-240a.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83f53610-5d41-4d60-a395-a41558c9e113/bt_notice_app_for_u8_smartwatch_download.pdfIn PDF document text
    • https://s3.amazonaws.com/panokojol/argumentative_writing_example.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_off0000f1a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A6 5636 bytes
SHA-256: 298d7723a9090ee0358bbd980f6d156b6cfc2f26b0c234428729d547458ce16f
font_01_sfnt_off000104c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C6 10368 bytes
SHA-256: 07cba3032de9c0c12e8af6456703844f4f7a928d24e9e2fde1766465639e761f

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