Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a3cd30dab8076a2…

MALICIOUS

PDF

77.2 KB Created: 2021-03-23 00:40:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 639647a89a9ff4430c0568ba422f08d0 SHA-1: d9bce7ab0cae140304a161db0eed086f608caafc SHA-256: 4a3cd30dab8076a2a335d4d0b93a68435d3bfb8627735dde591eee5a514b6f87
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://mezovuduw.ru/strik?utm_term=what+to+do+if+washing+machine+is+not+draining PDF link annotation
    • https://fijakesu.weebly.com/uploads/1/3/4/5/134527503/8469062.pdfIn PDF document text
    • https://zulevoto.weebly.com/uploads/1/3/2/6/132696122/safanowexisug_vivobokedatarag_wufanopo_lobunoxonawubob.pdfIn PDF document text
    • https://cdn.sqhk.co/nibedogoxov/heksjg7/anime_wallpaper_phone.pdfIn PDF document text
    • https://cdn.sqhk.co/vixemujomu/sICvgjW/40122698621.pdfIn PDF document text
    • https://jibogikufojubu.weebly.com/uploads/1/3/1/4/131438018/be8b0fea8b.pdfIn PDF document text
    • https://cdn.sqhk.co/dogilijesiwu/fhapjaD/dubai_drift_2_hack_download.pdfIn PDF document text
    • https://cdn.sqhk.co/wufotubi/gjeqeSL/54463802529.pdfIn PDF document text
    • http://bijukexamova.scienceontheweb.net/84196125555.pdfIn PDF document text
    • http://moxilekulina.getenjoyment.net/fajifojebonesutedamigux.pdfIn PDF document text
    • https://zovakobazala.weebly.com/uploads/1/3/1/4/131456363/421549.pdfIn PDF document text
    • http://biwiroxefamir.mywebcommunity.org/wufafiwod.pdfIn PDF document text
    • https://lavigumujow.weebly.com/uploads/1/3/4/4/134438710/rewuwowuxegofe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vugugemo.atwebpages.com/98801258722.pdfIn PDF document text
    • http://niselasot.atwebpages.com/ecological_models_of_human_development.pdfIn PDF document text
    • https://s3.amazonaws.com/donukadizolin/java_1._8_for_mac_sierra.pdfIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/pdf_to_word_converter_free_app.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/maziboretajinobeladitafas.pdfIn PDF document text
    • https://s3.amazonaws.com/jizubisetebof/nuendo_4_autotune_8._1.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/chutti_tv_theme_song_free.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_off0000ef60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF60 5508 bytes
SHA-256: f90ed9596699863bdffc69ff16a82c1c3e4d04d66ba04396b5d3998580af70b2
font_01_sfnt_off0001020e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020E 11116 bytes
SHA-256: 6974b693684605005772543571039e341f61c3563374778074b09e2563d5dee0

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