Malicious PDF — malware analysis report

Static analysis result for SHA-256 e41798a8e377d830…

MALICIOUS

PDF

70.1 KB Created: 2021-03-11 05:56:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4ab96ff4c3c3d89fed49005e653e94bc SHA-1: 672d570616f63d3a2efcc1feffd411d161493a58 SHA-256: e41798a8e377d8302d60afa53803477214370a05ecc42bd578f38b899dc30073
74 Risk Score

Malware Insights

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

The ML classifier and PDF heuristics strongly indicate malicious intent. The presence of numerous external URIs, many hosted on disposable domains, suggests a link farm designed to redirect users to potentially harmful content. The 'SE_DOWNLOAD_BUTTON' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=alif+novel+pdf+complete PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470688/normal_602d1fd5b5b07.pdfIn PDF document text
    • https://cdn.sqhk.co/noxisoture/pqibjgV/94574883323.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489415/normal_601b82d1bcd6b.pdfIn PDF document text
    • http://dobilarujokux.sportsontheweb.net/migevigenapufi.pdfIn PDF document text
    • http://befotuke.mywebcommunity.org/badovotupexokowefe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460247/normal_603cfa6927d48.pdfIn PDF document text
    • https://cdn.sqhk.co/delobepaziw/djahiNJ/watch_minority_report_on_netflix.pdfIn PDF document text
    • http://tuwasukam.getenjoyment.net/reduce_quality_mac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464702/normal_6037baab8f015.pdfIn PDF document text
    • https://rofaxebawo.weebly.com/uploads/1/3/4/7/134750080/tavosizateg.pdfIn PDF document text
    • https://vipobonufemug.weebly.com/uploads/1/3/5/4/135401160/4440976.pdfIn PDF document text
    • http://benilobodereji.mygamesonline.org/70693759394.pdfIn PDF document text
    • http://rexonina.medianewsonline.com/45282026079.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://binuwuzipu.myartsonline.com/carrom_tournament_rules.pdfIn PDF document text
    • http://faxiruvud.myartsonline.com/ponejur.pdfIn PDF document text
    • http://vujuvisesakok.myartsonline.com/42409595551.pdfIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/fenalexawufido.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/80801481588.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/pedosisapupor.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/arya_2_malayalam_movie_audio_song.pdfIn PDF document text
    • http://tifavamifikas.myartsonline.com/cursos_de_ingles_en_linea_mejores.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_off0000cc3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3E 4652 bytes
SHA-256: f7b1756f51a53445470bd145dc2090c069a6fcc652ee7dc12efc200b5d772595
font_01_sfnt_off0000dbff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFF 9752 bytes
SHA-256: 7c9166e174c1aa48fd1d73be925c499bbc421a68f5409469d8da825af013ddc8
font_02_sfnt_off0000fd65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD65 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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