Malicious PDF — malware analysis report

Static analysis result for SHA-256 4202e816ec1c6bea…

MALICIOUS

PDF

188.6 KB Created: 2021-04-02 02:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 7a1776df7c2899dce71ba616be0a60a0 SHA-1: 61fdbe44abdf2963574249739aaac68b7bca329c SHA-256: 4202e816ec1c6bead6d1c323422ec18a665ae069f9e47de648659b414cb9834d
124 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a known malicious domain, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also flagged this PDF with high confidence. While no scripts were extracted, the presence of malicious redirector links suggests an attempt to lure the user to a harmful site, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=basic+french+vocabulary+words+in+korean In PDF document text
    • http://paxejunon.mygamesonline.org/99104560731.pdfIn PDF document text
    • http://muldwych.com/nha_medical_assistant_study_guide_freexfp0c.pdfIn PDF document text
    • http://bionatur.space/harry_potter_and_the_sorcerers_stone_book_chapter_17dvjef.pdfIn PDF document text
    • http://kijofizovurisos.medianewsonline.com/is_walmart_now_open_24_hours.pdfIn PDF document text
    • http://filozajerezabi.getenjoyment.net/nozasuroritikuv.pdfIn PDF document text
    • http://vodabutopidaru.getenjoyment.net/seth_godin_tribes_quotes.pdfIn PDF document text
    • http://tobaliwono.mygamesonline.org/3036832015.pdfIn PDF document text
    • http://woziwowariv.sportsontheweb.net/antibioticos_betalactamicos_2020.pdfIn PDF document text
    • http://fudoviwil.mywebcommunity.org/ruxejurifage.pdfIn PDF document text
    • http://help-business-media.com/litapubijujezen8bbz.pdfIn PDF document text
    • http://pemufosapakem.mypressonline.com/dutelexo.pdfIn PDF document text
    • http://larebalin.mypressonline.com/management_accounting_for_business_decisions_drury.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/4134a1fc-018c-4e16-83b2-ee0375db2d8a/why_is_my_ecobee_thermostat_not_working.pdfIn PDF document text
    • http://bemuvarewu.onlinewebshop.net/ways_of_the_world_3rd_edition_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/908b77ed-d4a6-4f7f-963f-35135930f541/moped_puncture_repair_near_me.pdfIn PDF document text
    • http://wiwosotu.myartsonline.com/1110788450.pdfIn PDF document text
    • https://849bdae7-2456-4570-9e2a-fc769e7e49ad.filesusr.com/ugd/2074c9_7fcf3f04a960473080151cb11eb6f59b.pdf?index=trueIn PDF document text
    • https://00e6f838-d17c-4130-b616-1adf5f4d9bb3.filesusr.com/ugd/714321_571717e752da4091a6fe21951f8e5b0a.pdf?index=trueIn PDF document text
    • http://domebiwek.myartsonline.com/treatment_of_congenital_heart_disease.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7331a9c-d868-4c19-8a52-27f861f69b4b/5756744067.pdfIn PDF document text
    • http://ligoroxenafof.atwebpages.com/how_to_draw_an_anime_character_girl_full_body.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001e23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E23B 55052 bytes
SHA-256: a1e28f9a2ce3ec76fdafdd19cced9d12b25875c2444f673689011749b342ff67
font_01_sfnt_off000280ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x280CE 5616 bytes
SHA-256: 6923f025e6fa27df7c355954d8d6d8f8b9f30b794ba16184ea8a058b089a6a62
font_02_sfnt_off00029400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29400 19088 bytes
SHA-256: 28e33e60d044288d66be6f34d6e9239d5d6e423b029b7cdac149da457a5e9a04
font_03_sfnt_off0002cc58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CC58 16116 bytes
SHA-256: ba9b5293d46f42e597c092e757bf770b0226661663f119891d806c1875324a0c