Malicious PDF — malware analysis report

Static analysis result for SHA-256 25838a2916cddfcb…

MALICIOUS

PDF

84.1 KB Created: 2021-03-20 02:28:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 0e5f430ae738ab801893b9e44de3cd42 SHA-1: 143e6f40341921b155d99368f38320c938f50755 SHA-256: 25838a2916cddfcb81a7e916e1328671caec895e24dc9f2d8af4e7a40fbba4d1
126 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many pointing to disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://kuzutuzo.ru/wix?keyword=starbucks+going+global+fast+case+study+answers PDF link annotation
    • http://tanemazijafawin.medianewsonline.com/birifotowa.pdfIn PDF document text
    • http://xalapuzim.sportsontheweb.net/wuwesemanasomatira.pdfIn PDF document text
    • http://jiwabozaxexe.mypressonline.com/what_should_a_30_month_old_child_be_doing.pdfIn PDF document text
    • https://cdn.sqhk.co/tusufawenu/hahbdbd/world_war_2_quizlet.pdfIn PDF document text
    • https://cdn.sqhk.co/dugelabomaw/igUYjhl/fernanfloo_geometry_dash_1.pdfIn PDF document text
    • http://vvinorama.website/90912532218u6fum.pdfIn PDF document text
    • http://sakivometo.medianewsonline.com/invisible_man_2020_suit_design.pdfIn PDF document text
    • http://dvestideyli.xyz/xaxenarezifapowusimep7qly.pdfIn PDF document text
    • http://jekeluxuto.mywebcommunity.org/caractersticas_de_los_motores_de_corriente_alterna_y_corriente_directa.pdfIn PDF document text
    • http://moxipafuxoxo.mygamesonline.org/lejorogobobas.pdfIn PDF document text
    • https://cdn.sqhk.co/lerotakisisa/gehgjg2/nosubusavajejivixukazegal.pdfIn PDF document text
    • http://wulutapebime.getenjoyment.net/tuvemapidelalopusaku.pdfIn PDF document text
    • http://se-mrush.com/samsung_tv_service_center_thrissur_contact_numberw0ypi.pdfIn PDF document text
    • https://cdn.sqhk.co/jimumakevaji/hNgcmXT/45299109186.pdfIn PDF document text
    • http://ruxiroxawem.22web.org/15795979762.pdfIn PDF document text
    • http://tortomsk.ru/kalisikamomo6mt7l.pdfIn PDF document text
    • http://uscreditreport.info/like_box_mod_apklpur2.pdfIn PDF document text
    • http://ribadubeko.scienceontheweb.net/20511467199.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jitawidavez.atwebpages.com/experimental_aerodynamics_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d414a3a-20b5-440d-a6f8-e688717a583f/gituvoxajodono.pdfIn PDF document text
    • http://nivefozug.rf.gd/lijipajenelalonisixegema.pdfIn PDF document text
    • http://defozuwonig.rf.gd/259147481.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e935a282-8914-4128-90f9-a9389360098f/starting_a_freelance_writing_business_in_canada.pdfIn PDF document text
    • http://pojozija.onlinewebshop.net/90712422972.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_off00010a44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A44 5692 bytes
SHA-256: 3c495b6114e9279f467b720898ed3e997731f7d5ba97cf55e689ab1f9733de9c
font_01_sfnt_off00011dcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCB 10824 bytes
SHA-256: f68d3ca5ff8f09abbbf3e315bbfa09e39108c9403b85b9802c77e570b3761a2b

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