Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef914d07669390d7…

MALICIOUS

PDF

74.0 KB Created: 2021-04-14 06:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ded66f623b76a7c151945ae28eb4b53a SHA-1: b4b0b447602e6b4ea31bb4de45cfadcae82a7bef SHA-256: ef914d07669390d790c5c855203030a0cf3c4f1f433e7130e32579a82073856f
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous external URIs, many of which point to disposable hosting and are likely used for phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically indicates a link farm on disposable hosting, suggesting a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/strik?utm_term=ncl+escape+deck+plan+9 PDF link annotation
    • http://profyhouse.ru/carl_rogers_theory_on_personalityr45fk.pdfIn PDF document text
    • http://svarka-aurora.online/9270135322hurn4.pdfIn PDF document text
    • http://spiritstudio.ru/php_7_data_structures_and_algorithms_download_freer2hmo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485012/normal_601470fc212dc.pdfIn PDF document text
    • https://cdn.sqhk.co/wareberefiz/6gjgddl/mhw_large_wyvern_gem_drop_rate.pdfIn PDF document text
    • http://tells.fun/alcatel_2038x_mobile_phone_user_guidemy0d1.pdfIn PDF document text
    • https://cdn.sqhk.co/ximepadogi/gfejaFm/nasal_cavity_diagram.pdfIn PDF document text
    • http://afracheat6.xyz/chemical_formula_of_coconut_oilwz4t8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486060/normal_604de2d65525c.pdfIn PDF document text
    • http://uspeh.icu/35405808053ylpd2.pdfIn PDF document text
    • https://nunipotewisi.weebly.com/uploads/1/3/4/8/134892443/foriselujax.pdfIn PDF document text
    • https://nupebovewurezo.weebly.com/uploads/1/3/2/7/132710783/5859373.pdfIn PDF document text
    • https://sepuvomaxobaba.weebly.com/uploads/1/3/5/3/135311468/dozusa_zatidalikurosef.pdfIn PDF document text
    • https://fuxiwajusefu.weebly.com/uploads/1/3/4/6/134617271/bidotaruwibimev-vutajan-kilekow-sakonim.pdfIn PDF document text
    • https://lixobezabutefa.weebly.com/uploads/1/3/1/4/131406736/977e65126.pdfIn PDF document text
    • http://bumaga.bz/389881762553faey.pdfIn PDF document text
    • http://btsworld.org/nocturnal_enuresis_nice_guidelineslrezu.pdfIn PDF document text
    • http://sentytld.online/72946311764dd9f1.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/122c238c-08b0-49f9-8a8f-83b56e0a55fc/do_you_need_an_adapter_for_xbox_one_turtle_beaches.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a684037-9a58-4aef-a087-983590fe607c/how_to_prep_for_gre_for_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3d7bf58-e83d-46b2-8eac-ac2047dac687/8346266462.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8e012ed-84d4-4bb4-bb98-e9aae7f301f8/do_you_wash_hair_dye_out_with_hot_or_cold_water.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_off0000e1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B1 5160 bytes
SHA-256: 7cf60e06f6e05a8694daabd7042fa3e8b983f2b48a52e0c85069c5aed3cae4d3
font_01_sfnt_off0000f35d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35D 11180 bytes
SHA-256: 2ff3d6715e53c3001072d34ca72a0896d514653b49d087c37c9388c8c276603b