Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6bcbd91827ee60d…

MALICIOUS

PDF

72.2 KB Created: 2021-03-18 13:27:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6b9643d84a89ca1c26dce6fc1e80073 SHA-1: 284fdd15d25e9e47baba1ab94d478733e1fac236 SHA-256: a6bcbd91827ee60d6d127e8fc2d0ef05d9dbad1e3086ad4e101ee98b8c693a50
66 Risk Score

Malware Insights

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

The PDF document contains embedded URLs that redirect to external websites, masquerading as search results for educational content. The ML classifier strongly indicates maliciousness, and the PDF structure suggests it's designed as a link farm to distribute traffic to various disposable hosting sites. No scripts were extracted, but the presence of multiple external links points to a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://botokaw.ru/award?keyword=cell+biology+multiple+choice+questions+with+answers+pdf
    • https://tudaluvakagovax.weebly.com/uploads/1/3/4/6/134614365/xapawor.pdf
    • https://xalitizamer.weebly.com/uploads/1/3/4/8/134863297/zanisepolisolixux.pdf
    • http://judupebe.getenjoyment.net/binary_options_tutorial.pdf
    • http://vadosixajobirug.mygamesonline.org/bring_up_genius.pdf
    • https://zekenegelu.weebly.com/uploads/1/3/4/3/134390475/mewifujibepe_mazegumoganevo_gedum_xumeta.pdf
    • https://cdn.sqhk.co/gupetipek/Jid3ghw/bowetutosibezuv.pdf
    • http://velavedi.iblogger.org/ludanapo.pdf
    • http://setixin.iblogger.org/slack_app_store.pdf
    • https://cdn.sqhk.co/wasusoguba/jgjejgz/1187236625.pdf
    • http://vodabutopidaru.getenjoyment.net/hp_officejet_pro_8500_color_printing_problems.pdf
    • http://mitatizizuje.mypressonline.com/9350016995.pdf
    • http://gimatadokij.mygamesonline.org/who_is_indias_new_chief_of_army_staff.pdf
    • http://vataponuxizeliz.mywebcommunity.org/33311344026.pdf
    • https://sizosadul.weebly.com/uploads/1/3/3/9/133986432/refixedetid.pdf
    • http://manaxupupili.iblogger.org/gaxotolekege.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wujuxupizosafe.rf.gd/mikilagexukunaf.pdf
    • https://uploads.strikinglycdn.com/files/622e040c-77ae-4992-b8c6-fa7bebcad751/8450898589.pdf
    • http://tivupomemotet.rf.gd/48372953806.pdf
    • https://uploads.strikinglycdn.com/files/d0df958f-0a6d-4cd8-b853-1a3ac3f64197/25426963640.pdf
    • http://nerezusilanake.atwebpages.com/balistica_judiciara.pdf
    • http://kakasis.onlinewebshop.net/what_is_the_difference_between_folk_and_popular_culture_brainly.pdf
    • https://uploads.strikinglycdn.com/files/63ff8e58-50fa-4a80-b449-3477a5cd24e9/motorola_sb6120_specs.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de53.bin
ae4fb4bfdcdfbfb9262b423a1317c19e6a5e109d193a476f0fb7a2443e7ef1d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE53 5936 bytes
font_01_sfnt_off0000f264.bin
ad9755e2d6c38249cb9108bb95574391bd0d6880a011cf1861453d2bf29363cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF264 11200 bytes

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