Malicious PDF — malware analysis report

Static analysis result for SHA-256 c254059f27cb855c…

MALICIOUS

PDF

82.6 KB Created: 2021-04-06 12:32:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: bdfddf93b8e7493e70ec20ca12fc8ecf SHA-1: cb60d19522233537013cf022438d6f34f8ece953 SHA-256: c254059f27cb855ce689f863b41c697a657a8c161f98dc8fcc99893202679530
136 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it's a phishing lure, specifically using a search query related to 'resistance band exercises for arms pdf' to disguise a malicious redirect. The primary malicious URL identified is https://jumiwimov.ru/award?keyword=resistance+band+exercises+for+arms+pdf. ClamAV also detected this file as Pdf.Phishing.Trojan, further supporting its malicious nature. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://jumiwimov.ru/award?keyword=resistance+band+exercises+for+arms+pdf PDF link annotation
    • http://viewcreditscore.info/molame66m9z.pdfIn PDF document text
    • http://dehydratedoriginalgoodness.com/baaghi_movie_videoc0jse.pdfIn PDF document text
    • http://energierecrute-emplois.com/merit_badge_university_2021_illinoisx27u4.pdfIn PDF document text
    • http://disozire.mygamesonline.org/new_york_life_deferred_income_annuity.pdfIn PDF document text
    • http://mamontov-net.cc/why_is_kanekis_hair_whiteyz3kf.pdfIn PDF document text
    • http://bidetoluji.getenjoyment.net/hard_rock_cafe_new_york_menu.pdfIn PDF document text
    • http://novubelugalij.medianewsonline.com/brachial_plexus.pdfIn PDF document text
    • http://veviwumifuvemuz.mypressonline.com/nuwizapul.pdfIn PDF document text
    • http://weridif.medianewsonline.com/dawezufasumozixepaz.pdfIn PDF document text
    • http://persequen.com/713655799953s403.pdfIn PDF document text
    • http://duvejiwuxikon.getenjoyment.net/business_correspondence_and_report_writing.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nunavaxukozu.onlinewebshop.net/pasar_un_archivo_a_word_sin_programas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50595630-fecd-4cee-8aa1-50cfc71c5f94/82952843336.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9202870b-1c74-4ad3-9d5d-757cecd9e06e/hydrological_cycle_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/gekojulog/what_does_application_filing_period_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/parallel_postulate_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/tofazupakuwik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/badc1bae-6488-4975-8e48-507b3907c18d/tudogovonotosawek.pdfIn PDF document text
    • https://s3.amazonaws.com/gekixadonuru/writing_a_letter_of_application_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/mozirolinitaje/pugewutudagizakor.pdfIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/jifirubizijonuwikawaxi.pdfIn PDF document text
    • http://limufij.myartsonline.com/acidosis_metabolica_en_nios.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/wevodubagilesosun.pdfIn PDF document text
    • http://jemileti.atwebpages.com/fuzesexalef.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_off000103a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A0 5484 bytes
SHA-256: b889695d1f9636ca9be1dc9eabb6dafa19c24f88c5b34e4e9ecb613ab6db7254
font_01_sfnt_off00011635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11635 10832 bytes
SHA-256: d0d97bf8a6de041d32f6fcf66a30a1a96e81bcbb9ddbc688b8e47cd6abdf9e41