Malicious PDF — malware analysis report

Static analysis result for SHA-256 87daa7ad89645186…

MALICIOUS

PDF

74.2 KB Created: 2021-02-26 12:41:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c3ddf12e602ad674257ce4e649d34de9 SHA-1: 901a53e679061d174051c3954e465e837c1601aa SHA-256: 87daa7ad89645186a2749fd133a593132816721cdbe1046059918dcc1946ba73
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://botokaw.ru/award?keyword=lifetime+44+basketball+backboard+pole+%2526+base PDF link annotation
    • http://newipufisatag.scienceontheweb.net/first_aid_usmle_step_2_cs_7th_edition.pdfIn PDF document text
    • http://lnstagramoriginal.com/gitemamabaxegiwalm29us.pdfIn PDF document text
    • http://legko.travel/best_100_message_ringtones_for_androidqeygd.pdfIn PDF document text
    • https://cdn.sqhk.co/ranetixeba/hijViiG/kizitaxun.pdfIn PDF document text
    • http://xedeporib.medianewsonline.com/the_wifes_lament_poem_annotation.pdfIn PDF document text
    • http://wefigofozotime.22web.org/tricep_rope_pushdown_form.pdfIn PDF document text
    • http://nazorizuz.medianewsonline.com/contabilidad_de_costos_ejemplos_libro_diario.pdfIn PDF document text
    • http://nanonewe.scienceontheweb.net/22336073163.pdfIn PDF document text
    • http://kiwenalod.medianewsonline.com/second_hand_collectors_dolls_houses_for_sale.pdfIn PDF document text
    • http://winoraama.site/20786309344jumdj.pdfIn PDF document text
    • http://secret-empire.ru/how_to_combine_like_terms_with_different_exponentsrg9q0.pdfIn PDF document text
    • http://xafopawiki.medianewsonline.com/16732931994.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://navepufukoxo.rf.gd/focusrite_scarlett_2i2_review_espaol.pdfIn PDF document text
    • http://tososite.onlinewebshop.net/reviews_shark_ion_robot_vacuum_r75_with_wi-fi_rv750.pdfIn PDF document text
    • http://bivojeda.atwebpages.com/how_to_start_a_comic_script.pdfIn PDF document text
    • http://tefetuzuzip.myartsonline.com/asus_motherboard_sabertooth_990fx_r2.0_drivers.pdfIn PDF document text
    • http://luvewon.epizy.com/kenmore_appliance_repair_kitchener.pdfIn PDF document text
    • http://sazasewugekupej.onlinewebshop.net/kidde_smoke_alarm_i12060_home_depot.pdfIn PDF document text
    • http://gifetezese.rf.gd/gilirevonelufopet.pdfIn PDF document text
    • http://zasujofimak.epizy.com/annual_credit_report_equifax_problem.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_off0000e412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE412 5536 bytes
SHA-256: 664f4e78a9c41d912dfffe1cf9d47b207a4f02246c7891b53d00e809c17550de
font_01_sfnt_off0000f6d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D4 10824 bytes
SHA-256: 49ebbe7c79378d9a93de0e72cca0cad61dc89e5a6501cb011db4dfc3d9e50082

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