Malicious PDF — malware analysis report

Static analysis result for SHA-256 87106b75d40e5543…

MALICIOUS

PDF

84.0 KB Created: 2021-06-13 06:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 531d42d88bcbc84a70f34338547662fe SHA-1: 3cea97ae97c48660ab41454a46ce87427f058e05 SHA-256: 87106b75d40e55431cbfbd3a1341c4d5ec350e607760ed71d24f14f3c792ae9a
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external URIs, with one pointing to 'ponafet.ru', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host many links on disposable hosting, further supporting the malicious intent. No scripts were extracted, but the presence of multiple external links implies an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/123?utm_term=360+antivirus+free++pc PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366351/normal_6013866fba8d9.pdfIn PDF document text
    • https://mutobituza.weebly.com/uploads/1/3/4/3/134352411/7471160.pdfIn PDF document text
    • https://pudafakomixi.weebly.com/uploads/1/3/4/5/134506615/20427cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382193/normal_5fe9816e57c9b.pdfIn PDF document text
    • https://rowimibakerideb.weebly.com/uploads/1/3/4/4/134494798/joxenovimupir_rajulunu_fesumofi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415745/normal_60070550776cc.pdfIn PDF document text
    • https://najunores.weebly.com/uploads/1/3/4/3/134381484/6414982.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422133/normal_60608df874eff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375199/normal_5ff659d45e1b4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://jojuzoxox.pbworks.com/w/file/fetch/145217502/beyonce_irreplaceable_download_mp3.pdfIn PDF document text
    • http://dipoziw.pbworks.com/w/file/fetch/145073457/bhool_bhulaiyaa_full_movie_download_mp4moviez.pdfIn PDF document text
    • http://siwuromo.pbworks.com/w/file/fetch/144560331/libro_de_probabilidad_y_estadistica_para_ingenieros_montgomery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06249b05-c165-43ff-bebc-2a19eb39d6a4/can_you_play_rainbow_six_siege_with_mouse_and_keyboard_on_ps4.pdfIn PDF document text
    • http://faxamom.pbworks.com/f/24245076128.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1832020f-2977-4c24-82e7-1392255f4ca9/bridges_in_mathematics_grade_5_home_connections_answer_key_second_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86b93844-baf7-4013-8989-02d70fe1dc21/bexozotinutoviruwelaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64ddf301-8402-4cfe-873d-cbbb27837226/calculo_integrales_indefinidas.pdfIn PDF document text
    • http://zixememot.pbworks.com/f/how_to_hack_blockman_go_bedwars_fly.pdfIn PDF document text
    • http://kesowununak.pbworks.com/f/naruga.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD18 5172 bytes
SHA-256: a74b210c19030f6491f4bfabb475522209e559fe67d12f64ab1ceda758a7a1be
font_01_sfnt_off00010eb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB0 10856 bytes
SHA-256: 766eefc46b2ee092e43f65c8c4dc19e43f6a61151da55ab07f2394a20ba66b0b
font_02_sfnt_off0001339f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1339F 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378