Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a8bdcded15cdb89…

MALICIOUS

PDF

75.7 KB Created: 2021-05-16 21:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 45515e3aeff63e402ebc63525641c47a SHA-1: 20884bc84fabc0f2200a1270650e61c5ca6ef76f SHA-256: 4a8bdcded15cdb8969aa430c94966573eb9bad1196d1f3d12d434fd913656abb
126 Risk Score

Malware Insights

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

This PDF file is classified as malicious, exhibiting characteristics of a phishing or link farm attack. It contains numerous embedded URLs, many pointing to disposable domains, designed to redirect users to potentially harmful content. The primary lure appears to be related to search results for "Best books for learning korean reddit", aiming to trick users into clicking through to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://nipisod.ru/strik?utm_term=best+books+for+learning+korean+reddit PDF link annotation
    • http://jidogirikar.mygamesonline.org/pdf_to_word_software_online.pdfIn PDF document text
    • http://jenuxijaf.mygamesonline.org/maytag_bravos_washer_not_spinning.pdfIn PDF document text
    • http://fejekadiwoxobiz.getenjoyment.net/medical_entomology_laboratory_manual.pdfIn PDF document text
    • http://tetiviguxawik.getenjoyment.net/platonism_and_anti_platonism_in_mathematics.pdfIn PDF document text
    • http://vevovifox.scienceontheweb.net/diet_for_blood_type_o_positive.pdfIn PDF document text
    • http://okrasote.info/metal_gear_solid_v_the_phantom_pain_characters_playable0gt9v.pdfIn PDF document text
    • http://reform-st.ru/dirun6arr7.pdfIn PDF document text
    • http://rowexusaje.mypressonline.com/camping_gear_list.pdfIn PDF document text
    • http://skout.tech/64826173600zz4w5.pdfIn PDF document text
    • http://tamigome.scienceontheweb.net/83034164252.pdfIn PDF document text
    • http://olx-delivery.cc/profusion_garage_heater_fan_not_workinglta0w.pdfIn PDF document text
    • http://joy-todays.online/wanojoz6vdeh.pdfIn PDF document text
    • http://timecodes.net/best_blackjack_cheat_sheettcwo8.pdfIn PDF document text
    • http://rabota-plus.club/alchemist_book_storyy4c7u.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2e6726a7-2e78-456a-9fa1-8bc85c3b20a6.filesusr.com/ugd/76e31d_8253e71a2b324608bcbe63037947a6cf.pdf?index=trueIn PDF document text
    • https://22e365c6-0853-42e1-82f8-83473bf9c0bf.filesusr.com/ugd/217d68_f03ce24e11cf410eb0e2c9b38a2e278e.pdf?index=trueIn PDF document text
    • http://wegamaluperetuj.atwebpages.com/55575153921.pdfIn PDF document text
    • https://c46c713f-5e69-4c64-aad4-d86f29440f76.filesusr.com/ugd/957c7b_26579083bb07434fb25607d3b88b37f8.pdf?index=trueIn PDF document text
    • https://042e50b4-45d0-4577-915a-c14d43ab21ad.filesusr.com/ugd/18f527_c3ae0822b165474b9c9c6fc729d2c29d.pdf?index=trueIn PDF document text
    • https://4b523d79-2bc6-404f-8e52-0acae4d2cb03.filesusr.com/ugd/fe1b41_f5521d5a9d734a309dd50f1b9cd3b165.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35B 7200 bytes
SHA-256: b651053b4d7abfae5ead6cf5cbf7765a1f7592df35ef4793194663dae3e9184d
font_01_sfnt_off0000eb0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0F 5328 bytes
SHA-256: 69c9815e12b347f51a90699e9bf5578f97402086a2d039f678f0d83298caf305
font_02_sfnt_off0000fd44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD44 10412 bytes
SHA-256: f110cf6096aa54c13b6080b8bf3e396abeccfb252e0161150673e8b4d2c18fff

Open this report in the interactive analyzer, or submit your own file for analysis.