Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d9fe01bea74b305…

MALICIOUS

PDF

73.2 KB Created: 2021-02-23 05:33:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 663a60f0095d0ada71d03543d969fa9a SHA-1: 76383876b52afa29ee307360d9175e0adc01cb45 SHA-256: 5d9fe01bea74b30521428cc948bcc215381ac344a8c094bf47711d0bbc2de9c7
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with one specifically identified as a link farm on disposable hosting and another pointing to a URL that appears to be a lure for 'dbt therapy nyc medicaid'. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and the nature of the embedded links suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/strik?utm_term=dbt+therapy+nyc+medicaid PDF link annotation
    • http://amsidisi.xyz/40834575590bqamm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375350/normal_5fdbe3e9ea632.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492900/normal_5fd0eac2309b5.pdfIn PDF document text
    • http://reduslimitalia-official.site/11742331874pmhm2.pdfIn PDF document text
    • http://ersoil.fun/comentario_matthew_henry_completodi0t3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475212/normal_600290ebdade2.pdfIn PDF document text
    • http://mifvideo.space/splash_screen_design_psd_freem24xz.pdfIn PDF document text
    • http://verification-help.business/the_lottery_literary_analysis_answersusugy.pdfIn PDF document text
    • http://gejopuzebizovuk.iblogger.org/nepowelepidevu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tovajukoxeboder.epizy.com/28825235114.pdfIn PDF document text
    • http://lebevinawefebo.rf.gd/fifulexetofiwujax.pdfIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/catia_tutorial_free.pdfIn PDF document text
    • http://riwexakax.epizy.com/minecraft_lenov._ru.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_off0000e014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE014 5344 bytes
SHA-256: 3230fd9066f9b9c83ad0f831d08e088e78130e64f2744bc6706c265233ea3600
font_01_sfnt_off0000f21b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21B 11328 bytes
SHA-256: cbe4b788be488308a656b59103cafe4a73af0be97db5775b3db4462c246d2e8f

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