Malicious PDF — malware analysis report

Static analysis result for SHA-256 b83242d12c4d1665…

MALICIOUS

PDF

69.2 KB Created: 2021-03-10 08:49:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e0725d6f8f4d15bf6cbba12bce2fd4f3 SHA-1: 79be31144cb565cb11f699fd7367d5aca8d2cc4e SHA-256: b83242d12c4d1665b0d7d7d2bb4d1c648632af2796413fcefc71543e7ef7af88
126 Risk Score

Malware Insights

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

This PDF document contains numerous embedded URLs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' strongly indicate a phishing or malware distribution attempt. The primary IOC is the external URI pointing to a suspicious domain.

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://maypoin.ru/strik?utm_term=convert+250+cad+to+inr PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4381541/normal_5ff853ba41c66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445115/normal_5fd22cd8a91c5.pdfIn PDF document text
    • https://fexupewoxi.weebly.com/uploads/1/3/4/6/134619994/7457255.pdfIn PDF document text
    • https://mabudorowux.weebly.com/uploads/1/3/4/4/134458492/3785602.pdfIn PDF document text
    • https://xuwizaku.weebly.com/uploads/1/3/1/6/131606213/zikuvu_sokogefemunu_dewoxemibejijo_gewazufinereg.pdfIn PDF document text
    • https://bivesazi.weebly.com/uploads/1/3/4/6/134652180/tumozuja_gofodam_dukibapi_zonirabibof.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444353/normal_6004dafb7b966.pdfIn PDF document text
    • http://grinallex.shop/bisosubam00orv.pdfIn PDF document text
    • https://jiresuzava.weebly.com/uploads/1/3/4/7/134706808/seguzawur-mowoliwoti-fenetobasibem.pdfIn PDF document text
    • https://pukaxonimuno.weebly.com/uploads/1/3/4/4/134435323/vafozedaxano.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449614/normal_5fd2e32733065.pdfIn PDF document text
    • http://solapp.xyz/joponujinovowexii7qb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416302/normal_5fd0fe0d9e21c.pdfIn PDF document text
    • https://nifonafepo.weebly.com/uploads/1/3/5/3/135319448/sogabisovalegu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://debolar.epizy.com/93237215844.pdfIn PDF document text
    • http://wijogural.epizy.com/gladiator_2000_parents_guide.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_off0000d2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C5 5084 bytes
SHA-256: 4e2598a48e47420a840727186d159792d066fe7cbf5f45510fc5b3c2ea5066a5
font_01_sfnt_off0000e424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE424 10424 bytes
SHA-256: 4fe77b7ca49603bdbda38cc5cb0ffbffcfbdf0cd3f9b95f09f53ed6bc358e24a

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