Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c431d681cd645df…

MALICIOUS

PDF

84.3 KB Created: 2021-03-30 23:06:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a5e6e92aee84577f71aa771daf8538ae SHA-1: 6ce6956bcc2cf683a9c0de1373ce7647b0958190 SHA-256: 2c431d681cd645dfcfd3489f152bf913a75ef27e8bc94b97243624c0830938f7
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the nature of the link farm suggests the PDF is designed to redirect users to potentially malicious or deceptive content, possibly as a lure for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://leonvi.ru/123?utm_term=kaminarimon+japan+guide PDF link annotation
    • http://fogimikolasot.iblogger.org/95170399025.pdfIn PDF document text
    • https://pavonaxasove.weebly.com/uploads/1/3/5/3/135310158/7441d10b.pdfIn PDF document text
    • http://bimiwefumukiv.22web.org/totilodefulekevikivose.pdfIn PDF document text
    • https://dosidebeg.weebly.com/uploads/1/3/5/3/135318632/vadekos-pobizoxub-nenovum-vilivi.pdfIn PDF document text
    • http://lamiwefawiwa.iblogger.org/gamopodefupan.pdfIn PDF document text
    • https://bemazoveber.weebly.com/uploads/1/3/4/5/134512295/3571724.pdfIn PDF document text
    • https://kudaxemukuwofi.weebly.com/uploads/1/3/4/6/134691428/7e7e8cbfeb174.pdfIn PDF document text
    • http://lapiwudoxavov.scienceontheweb.net/a_case_in_point_book.pdfIn PDF document text
    • https://pabaxugu.weebly.com/uploads/1/3/2/6/132695470/bexoxisokix_duwudexaxon.pdfIn PDF document text
    • https://verulezame.weebly.com/uploads/1/3/0/8/130814285/d8c2590258fd7d.pdfIn PDF document text
    • http://lakegefufen.scienceontheweb.net/warm_bodies_film_completo_streaming_ita.pdfIn PDF document text
    • http://rorasilozaput.22web.org/gothic_architecture_characteristics_ppt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://niruvizuzeta.epizy.com/intellect_design_arena_annual_report_2017.pdfIn PDF document text
    • http://vutakeba.epizy.com/awdhesh_premi_ka_bhojpuri_video.pdfIn PDF document text
    • http://geworikirabud.epizy.com/calibre_de_cables_indeco.pdfIn PDF document text
    • http://gasunerumep.rf.gd/25246708295.pdfIn PDF document text
    • http://xobebol.onlinewebshop.net/jigugejusi.pdfIn PDF document text
    • http://tagekef.rf.gd/the_accountant_full_movie_in_tamil.pdfIn PDF document text
    • http://dajomezivurisal.epizy.com/83997803848.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_off0000f3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F5 7776 bytes
SHA-256: c9ae92e242006c37b8ff29530101ce75f2a440a94e864c0b6669e11e06dcd78a
font_01_sfnt_off00010ddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDF 5112 bytes
SHA-256: 3cd5b085b7239a9fd7b04ba5fdfe07bb46afa8616d8f257c25fba95d67afd6c9
font_02_sfnt_off00011f38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F38 10780 bytes
SHA-256: 12f41bab3db534c47a9592d33a64514052284874f50489a7fb7e5fdda5918cdf

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