Malicious PDF — malware analysis report

Static analysis result for SHA-256 16068601c1c14c51…

MALICIOUS

PDF

77.9 KB Created: 2021-04-01 19:07:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e5f3d04d03d0391b4c0ba173efc24c9f SHA-1: ca241d43ef6340fa748b1043966aa8e44691b5d9 SHA-256: 16068601c1c14c5114b0fc08f4be630736300b835a6b07e19432a22de8948da4
66 Risk Score

Malware Insights

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

The PDF document contains a high number of embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection scheme. The ML classifier strongly indicated maliciousness, and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the suspicious nature of the embedded links. While no scripts were directly extracted, the structure and heuristics point towards an attempt to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://druttle.ru/strik?utm_term=dewalt+miter+saw+dust+collection+adapter PDF link annotation
    • http://kekewawoxugar.sportsontheweb.net/ecg_rhythm.pdfIn PDF document text
    • http://zibikudupe.mywebcommunity.org/pojotalumowupidifuz.pdfIn PDF document text
    • http://goldenframecollision.com/bissell_proheat_2x_pet_manualh35af.pdfIn PDF document text
    • http://mevukavotidu.getenjoyment.net/how_do_i_fix_a_dish_hard_drive_failure.pdfIn PDF document text
    • http://wonizojaru.scienceontheweb.net/44236798877.pdfIn PDF document text
    • http://nemugub.mywebcommunity.org/sda_hymnal_sheet_music.pdfIn PDF document text
    • http://labiosdewonda.com/history_of_islam_in_south_asiauf5qm.pdfIn PDF document text
    • http://kufafukedexepix.mygamesonline.org/bobbi_brown_makeup_brushes_kit_price.pdfIn PDF document text
    • http://idealsit.fun/wifi_password_hacker_apk_download_for_androidxvedr.pdfIn PDF document text
    • http://jajosez.iblogger.org/super_mario_bros_2_theme_sheet_music.pdfIn PDF document text
    • http://sumemejosanavo.iblogger.org/48438588446.pdfIn PDF document text
    • http://tobufupevujuma.mygamesonline.org/zaxub.pdfIn PDF document text
    • http://reduslimitalia-ufficiale.site/togesarotasakakqqsy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://beperedusewigu.epizy.com/telugu_action_movies_free.pdfIn PDF document text
    • http://zigadewat.epizy.com/90686459938.pdfIn PDF document text
    • http://mudozegiviw.epizy.com/zeefo_crystal_chandelier_installation_guide.pdfIn PDF document text
    • http://gifesikubelazu.epizy.com/safety_1st_rapid_read_3-in-1_thermometer_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f31b81c-dd53-4cee-854f-7796ad79b93e/the_giver_chapter_questions.pdfIn PDF document text
    • http://komopojanali.rf.gd/95386333248.pdfIn PDF document text
    • http://josuxak.atwebpages.com/jagarikupogovisakopox.pdfIn PDF document text
    • http://jokosen.atwebpages.com/14916178327.pdfIn PDF document text
    • http://maladovefo.rf.gd/67712446889.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7289860-ec48-41d8-9912-58b10f22036a/63184250494.pdfIn PDF document text
    • http://zuwapupefitojit.rf.gd/descargar_libro_budismo_moderno.pdfIn PDF document text
    • http://vubuzixefixa.onlinewebshop.net/ezdrummer_how_many_computers.pdfIn PDF document text
    • http://fawogalupa.epizy.com/fekaginenadibawoxatakupob.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_off0000f23d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23D 5308 bytes
SHA-256: 9d98a1bb66534941cc869376dbaacdd7423b7bdcd3bbd40096ec181b9b68f6fc
font_01_sfnt_off0001044d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044D 11056 bytes
SHA-256: 9a6be7ffcc22bbd0f54a6d9ce81a79c099b9ea4b664101f66aad021376575b33