Malicious PDF — malware analysis report

Static analysis result for SHA-256 98ae43eb7700206b…

MALICIOUS

PDF

71.6 KB Created: 2021-04-06 07:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 1e40984f5a1160d22d5289f064973a86 SHA-1: 67cd3fb26489f146ec0b5a370ee28b99b44de001 SHA-256: 98ae43eb7700206b0e1cb7be9de84846cffcdaee35457b56f2083468dc26a9ce
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm on disposable hosting, with a high ML score and ClamAV detection as Pdf.Phishing.Trojan. The embedded URL points to a suspicious domain, likely serving as a lure for users to click and potentially download further malicious content. No scripts were extracted, but the overall structure and URL suggest a phishing or malware distribution attempt.

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://bologen.ru/strik?utm_term=libro+de+f%25C3%25ADsica+2+secundaria+2019+infinita+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4457848/normal_60296b90e88e0.pdfIn PDF document text
    • http://garobunatuxovi.scienceontheweb.net/9710043126.pdfIn PDF document text
    • https://cdn.sqhk.co/bitaxukezor/eihXjii/legexak.pdfIn PDF document text
    • http://kijorifoweb.22web.org/wevawinamusemadexuwukiw.pdfIn PDF document text
    • https://cdn.sqhk.co/molavagew/ggjgKvO/fake_nails_at_home_no_acrylic.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495055/normal_6017032f455fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368468/normal_6027629a520d3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494146/normal_6008a4fe238d6.pdfIn PDF document text
    • http://pusedoropeseb.66ghz.com/39541770227.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503390/normal_604e3ff32fbe7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zaxefemebidaz/libro_intervencin_en_crisis_slaikeu.pdfIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/kapibako.pdfIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/how_much_money_does_charli_damelio_earn_from_tiktok.pdfIn PDF document text
    • http://saxopurokike.rf.gd/whatsapp_app_for_windows_7_ultimate.pdfIn PDF document text
    • http://nabenejajoko.myartsonline.com/fukadaxebijodupifiveze.pdfIn PDF document text
    • http://kamegil.epizy.com/catalogo_de_cuentas_contables_completo.pdfIn PDF document text
    • http://jamanofubuvi.rf.gd/90892376424.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_off0000d759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD759 5732 bytes
SHA-256: 5d52c185ff6bd7d283152b876b200cca4d13cc80a549901dc22157e9e0aeafdd
font_01_sfnt_off0000eaf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF1 11164 bytes
SHA-256: 4103b0348ebdbfadd3be3b0aaf3e026368cf37e2f9c31265ed0ee3720a08d2ac

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