Malicious PDF — malware analysis report

Static analysis result for SHA-256 869f01464fd494c7…

MALICIOUS

PDF

72.7 KB Created: 2021-06-09 20:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b8edd8d5b447634046998e2b50ec59e4 SHA-1: aa96617141f58b08c9ed997618bd2722e727a758 SHA-256: 869f01464fd494c7eaf95f804b9b91c7c4fb2e960be8011a8cbd50217a38694c
66 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to disposable domains and Weebly hosting, suggesting a link farm or redirection scheme. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the presence of many embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate the document's primary purpose is to redirect users to potentially malicious external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://krisoc.ru/pbw?utm_term=naming+covalent+compounds+worksheet+chapter+6.5+answers+key PDF link annotation
    • https://viwoxinuzozaxa.weebly.com/uploads/1/3/1/6/131636825/72673.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467601/normal_6007ec516c29e.pdfIn PDF document text
    • https://japujavawewiri.weebly.com/uploads/1/3/2/6/132696154/4637327.pdfIn PDF document text
    • https://xumiwuwazugeri.weebly.com/uploads/1/3/4/4/134444831/bupipupun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494866/normal_6061fb699b641.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388426/normal_5fe35b0244a7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494432/normal_605901062c373.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370285/normal_5fc5daf13655d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391305/normal_605bdd5286208.pdfIn PDF document text
    • https://dewokiwo.weebly.com/uploads/1/3/6/0/136028273/4852931.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lagawiwefe.pbworks.com/f/66476225535.pdfIn PDF document text
    • http://zowonixepor.pbworks.com/f/performance_of_contrarian_outlook_portfolio.pdfIn PDF document text
    • http://buwutel.pbworks.com/f/kaspersky_security_center_10_connection_to_administration_server_is_lost.pdfIn PDF document text
    • http://katafuzum.pbworks.com/w/file/fetch/144482970/hotel_del_luna_music_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df2c0536-127f-4c9e-9f3c-e8d23ca30d70/how_to_get_rid_of_parasites_in_fish_tank.pdfIn PDF document text
    • http://wenitudodub.pbworks.com/w/file/fetch/144552519/how_to_write_a_business_email_asking_for_information.pdfIn PDF document text
    • http://zewalar.pbworks.com/f/english_grammar_book_for_class_12.pdfIn PDF document text
    • http://paditoxef.pbworks.com/f/gta_6_apk_obb_download_android.pdfIn PDF document text
    • http://pebokuvog.pbworks.com/f/how_to_use_instant_pot_duo_evo_plus_pressure_cooker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3aae913a-f3be-4332-a62d-61263e18eeac/how_to_play_call_of_duty_mobile_with_ipega_controller.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_off0000dcce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCE 6084 bytes
SHA-256: d4ee5a04a6c0c347e133222999817b67207fc84102db8aaa84bcf8458d69292f
font_01_sfnt_off0000f183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF183 10452 bytes
SHA-256: 83f4ae07974ee0fc0dbaf0515e3e3e51f4edb9955bdc2893370c1c59fdbe0cd4

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