Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fd1d0777b991e67…

MALICIOUS

PDF

82.7 KB Created: 2021-03-16 03:41:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4a783b839900c19ab10bc5e05d8b314b SHA-1: c3c2168838f3a88ffef32aa40be1a7c8d2a04f2f SHA-256: 5fd1d0777b991e67a34cc380d2824349df1eb46665513b2f966a3e8fd08c4311
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, with many pointing to disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded URLs are consistent with attempts to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jacksth.ru/award?keyword=the+alchemist+book+review+essay+pdf PDF link annotation
    • http://ig-mediateam.net/duplicity_synonym_falsehoodls968.pdfIn PDF document text
    • http://train-home.ru/alien_food_web_worksheet_answer_keyg5ha6.pdfIn PDF document text
    • https://levavago.weebly.com/uploads/1/3/5/3/135343263/sugoforakafot.pdfIn PDF document text
    • http://sutarakikim.scienceontheweb.net/76123472793.pdfIn PDF document text
    • http://falufob.iblogger.org/fadidozafa.pdfIn PDF document text
    • https://kalanuwil.weebly.com/uploads/1/3/4/6/134634674/kofog-leloviki-nesogeza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450516/normal_6018cf705ac12.pdfIn PDF document text
    • http://pigigozoruda.mypressonline.com/how_to_connect_vizio_sound_bar_to_sub.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460243/normal_5ffc12c3b9505.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4506063/normal_6007682579c3e.pdfIn PDF document text
    • http://reduslimitaly-official.website/acrow_prop_size_guidejicdq.pdfIn PDF document text
    • http://copyrightsupportforlnstagram.com/73436685691pcwvf.pdfIn PDF document text
    • http://indital.fun/beethoven_5th_symphony_sheet_music9886l.pdfIn PDF document text
    • http://good-production20.site/the_legacy_of_a_whitetail_deer_hunter_20181btae.pdfIn PDF document text
    • http://megikinazemurel.22web.org/abdominal_examination_in_pregnancy.pdfIn PDF document text
    • http://genoray.pro/timeline_excel_template_2018texwv.pdfIn PDF document text
    • http://mattelipsticks.site/very_loud_phone_ringtones_freewmvzp.pdfIn PDF document text
    • http://hotita.fun/28637340812ba21z.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nukivamo.myartsonline.com/in_the_heart_of_the_sea_movie_analysis.pdfIn PDF document text
    • http://pusapovewazigu.onlinewebshop.net/21915783412.pdfIn PDF document text
    • http://fuzariwa.rf.gd/10411026448.pdfIn PDF document text
    • http://talesezon.epizy.com/pututobo.pdfIn PDF document text
    • http://gixiluvigatekij.atwebpages.com/guitar_arpeggio_patterns.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_off000105fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FD 5800 bytes
SHA-256: d3698a679d4a1ac5efcd19bd2850357eac55b7349da8a248f9fd455f8d6abf54
font_01_sfnt_off000119a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A3 10400 bytes
SHA-256: aae0706620d14249027253af7fafb7fc169028d67f6d1f0cdd3365ccafd8ccf3

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