Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb7e471e38d72813…

MALICIOUS

PDF

85.2 KB Created: 2021-03-15 05:02:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: ceb283728a26fa00d1f4d5a4013fdd3f SHA-1: 3084c4fb25c5403faed2b6f9f65cccf9df310310 SHA-256: fb7e471e38d728134bff0b1557cd020055bcb8178d6e920e00b05717a64bad32
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are used in link farms, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains a title related to literary devices, suggesting a lure to disguise the malicious nature of the PDF.

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://dugedepap.ru/strik?utm_term=literary+devices+in+romeo+and+juliet+act+3+scene+2 PDF link annotation
    • https://rasiguxi.weebly.com/uploads/1/3/5/3/135314707/gisobobu-musodezukuta-veseselagikub.pdfIn PDF document text
    • http://zuzudijibogojag.22web.org/android_phones_under_5000_to_6000.pdfIn PDF document text
    • http://serururepus.scienceontheweb.net/belanuziniputa.pdfIn PDF document text
    • http://sreview.online/knowledge_base_bootstrap_template_freegutid.pdfIn PDF document text
    • https://dufubixapitosig.weebly.com/uploads/1/3/4/5/134503348/nuweremelesofaj_tobaro.pdfIn PDF document text
    • https://gonotelavekufuf.weebly.com/uploads/1/3/4/6/134615299/fodijawosi.pdfIn PDF document text
    • https://pogunokele.weebly.com/uploads/1/3/0/7/130739789/3448616.pdfIn PDF document text
    • http://ar-foto.art/my_lg_washing_machine_says_ue82638.pdfIn PDF document text
    • https://xepesirivow.weebly.com/uploads/1/3/1/4/131408502/aa1d7d.pdfIn PDF document text
    • http://gatowixipeba.mywebcommunity.org/xaxukusudufuleloni.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kalijumixu.epizy.com/apsrtc_app_smartphone.pdfIn PDF document text
    • http://tefabonapo.rf.gd/can_i_start_my_own_cleaning_business.pdfIn PDF document text
    • http://kukujixi.epizy.com/doteji.pdfIn PDF document text
    • http://fuluxewamotate.atwebpages.com/gunubopopuvubeju.pdfIn PDF document text
    • http://foxebunuref.epizy.com/apache_kafka_cookbook_free_download.pdfIn PDF document text
    • http://batogejupimole.rf.gd/gobugudewugifubenol.pdfIn PDF document text
    • http://nesuvumuvugelo.epizy.com/kukudodinezedoxobojilos.pdfIn PDF document text
    • http://nekejikuxomufi.epizy.com/nejukebaveje.pdfIn PDF document text
    • http://wiroxidimov.rf.gd/what_is_the_timeline_of_civilization.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_off00011097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11097 5560 bytes
SHA-256: beae2d25af5b2f94a576451649271887347258370b736355e698733355ffe61a
font_01_sfnt_off0001237e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237E 10564 bytes
SHA-256: a8463815e47aadb42deaa9d62ae853b4f573de006d890ee2fa890dc7a9fc3910

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