Malicious PDF — malware analysis report

Static analysis result for SHA-256 70e3503ddd095444…

MALICIOUS

PDF

84.5 KB Created: 2021-03-28 02:55:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 8dbb45eeab646804863ff372590da8b6 SHA-1: 21e3f0d9037e8b9e75938b304e083e46a62d6afe SHA-256: 70e3503ddd095444f697b0a258d2c01f606f95e47ad769491127696fd3171f8d
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://golowaki.ru/award?keyword=cerebellar+ataxia+physiotherapy+management+pdf PDF link annotation
    • http://baditunabupiru.mywebcommunity.org/brownian_motion_and_martingales_in_analysis.pdfIn PDF document text
    • https://cdn.sqhk.co/mugejufunij/XvJOMZm/jejusutosalatiwugi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404523/normal_603bfd93c9cfb.pdfIn PDF document text
    • http://vwwv-avito.online/84039296338namqj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457005/normal_5fdd2fd146983.pdfIn PDF document text
    • http://pisumuvate.sportsontheweb.net/tactics_for_toeic_book.pdfIn PDF document text
    • http://ek-arenda.ru/xijuzenuwuzupojifupp6tdo.pdfIn PDF document text
    • https://cdn.sqhk.co/vofaruvukuk/axjjahh/tumak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461216/normal_600ed2985c9eb.pdfIn PDF document text
    • https://cdn.sqhk.co/ragekasa/jjibijZ/check_cashing_store_near_me.pdfIn PDF document text
    • http://prostotit.site/molutetugutofekefoledir40uu4.pdfIn PDF document text
    • http://vuvabadiredowa.getenjoyment.net/cardinal_number_worksheet.pdfIn PDF document text
    • http://shtampshop.ru/ranger_aluminum_boats_for_sale_in_texasrao7i.pdfIn PDF document text
    • http://fitokapss.xyz/225547092136m5dc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e06e8306-d71e-4c92-aa1b-e8c52eeb44cb.filesusr.com/ugd/bc4951_ab1d5c85fc2349bc920bb155ddd98c9a.pdf?index=trueIn PDF document text
    • http://zozupajekuledus.myartsonline.com/balanitis_tratamiento_antibiotico.pdfIn PDF document text
    • http://bebovufuvuji.myartsonline.com/mapisagosikanemivir.pdfIn PDF document text
    • https://83bd47e3-138d-48d8-8d00-514fe13b91b0.filesusr.com/ugd/c87a2f_fdb5dbc7cd064efb901b5246edcf10f6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/68549549027.pdfIn PDF document text
    • https://cd65756b-a9c7-4cca-9498-1747a6459195.filesusr.com/ugd/05eb20_e381ea800eec430ebe85a9892a92b690.pdf?index=trueIn PDF document text
    • https://7ef5d8b8-74ac-4e0a-b0a0-fa61ca6462a8.filesusr.com/ugd/23e9be_ff41f19730684cc385180edfec003aa7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/luxelula/what_does_a_blinking_neutral_light_mean.pdfIn PDF document text
    • https://2c5a832e-93c4-4ab0-bef0-969ef348d747.filesusr.com/ugd/cc5daa_5770f13f52714cbfb1a834863fd05881.pdf?index=trueIn 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_off00010b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4C 5672 bytes
SHA-256: 8b4df205026d9105372bb4fc5206784de8e44a8d563f03ac05671eff319a815b
font_01_sfnt_off00011e6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6D 10976 bytes
SHA-256: 98f985dccbe4e8518c0a6d9277e6f296288ee8a9ec44f45e9f8ecdd459f0b4cb

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