Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a39f0224d7b2cc5…

MALICIOUS

PDF

73.9 KB Created: 2021-03-15 10:28:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: e6bfad8a9b09bbc35c5b4d00e466e8e0 SHA-1: 47bcb332fb10a7835aca7693960521b790584978 SHA-256: 4a39f0224d7b2cc590d9b93970a70d6baedbf3c1c16146e7c2cb3a0cdcc06184
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically highlights the use of link farms on disposable hosting, reinforcing the malicious nature of the URLs.

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://pelibifir.ru/wix?keyword=unit+6+test+review+chemistry+answers PDF link annotation
    • http://wacc-cat.org/kinuzafuzevadidoenmim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410018/normal_604ca8d8b2016.pdfIn PDF document text
    • http://callup.today/wonaxewojibizavizumiolbuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424645/normal_5fd1c01dbfdf9.pdfIn PDF document text
    • http://sopafekidis.sportsontheweb.net/90662760227.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373997/normal_6022a12453d65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413585/normal_600d6d524ba88.pdfIn PDF document text
    • http://xibipumazanepir.iblogger.org/14603812248.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377902/normal_6045b87fa39f9.pdfIn PDF document text
    • http://smartycredit.info/2003_honda_rancher_350_oil_capacityeedyl.pdfIn PDF document text
    • http://peteferix.mypressonline.com/gamagabirofefaxikaze.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473049/normal_5fe57af1b4608.pdfIn PDF document text
    • http://my-favshop.online/dashboard_reporting_templates_excelckiqs.pdfIn PDF document text
    • http://xigosilefonaboj.iblogger.org/how_to_find_slope_intercept_form_passing_through_2_points.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jegowijuvu.epizy.com/82080856121.pdfIn PDF document text
    • http://kudogato.rf.gd/90575259421.pdfIn PDF document text
    • http://xedojezu.rf.gd/10013501484.pdfIn PDF document text
    • http://mabagojovas.epizy.com/21287136299.pdfIn PDF document text
    • http://wibakidalidopex.epizy.com/libro_el_arte_de_no_amargarse_la_vida_gratis.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_off0000e3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D0 5408 bytes
SHA-256: 1ca37b524b8cfe5c43ad1c5792fa815007ef2e494c56a7cfa4ca4fa853319b37
font_01_sfnt_off0000f627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF627 10720 bytes
SHA-256: 0ae26c7f12359892839f9557eeef30ed2800395fbdf938ef820516dd4a08113b

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