Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bdc4eb283df2189…

MALICIOUS

PDF

76.0 KB Created: 2021-05-15 23:19:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: fe948da54cd703233f6f90984aca138b SHA-1: c9165a83c4639cbe5d4d80f3ad78b78b9a7da09d SHA-256: 1bdc4eb283df21893d0b07e9aa9c22f1f3e0b6714c241237c6d83762bd623800
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for distributing malware or phishing content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/strik?utm_term=is+masterclass+worth+it+for+actors PDF link annotation
    • http://letilemugemin.66ghz.com/11th_class_biology_notes_free_download.pdfIn PDF document text
    • http://pisufixefonof.scienceontheweb.net/breast_cancer_project.pdfIn PDF document text
    • http://xagakojitogiva.getenjoyment.net/79449079718.pdfIn PDF document text
    • http://pawomodom.medianewsonline.com/calendar_2020_uk.pdfIn PDF document text
    • http://gedadekenoz.mywebcommunity.org/bepog.pdfIn PDF document text
    • https://nokifijipuf.weebly.com/uploads/1/3/4/3/134305843/f14d923016.pdfIn PDF document text
    • http://alcexpress3.xyz/711294974894ymmm.pdfIn PDF document text
    • http://jawunefuda.mygamesonline.org/britain_for_learners_of_english_james_o_driscoll_download.pdfIn PDF document text
    • https://vumerajijo.weebly.com/uploads/1/3/2/8/132815742/wowaxevo.pdfIn PDF document text
    • http://pornbustyvids.com/black_boy_haircuts_fade_2020euelr.pdfIn PDF document text
    • http://summer-italy.fun/dugipiwutiwozimanigi2r0fx.pdfIn PDF document text
    • https://gomafaned.weebly.com/uploads/1/3/5/2/135296522/7452482.pdfIn PDF document text
    • http://verification-help.com/what_is_a_ferb_in_a_behavior_support_planpeyyk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/podawakumepewez/92272910705.pdfIn PDF document text
    • http://vilumepidiwego.myartsonline.com/32009138653.pdfIn PDF document text
    • http://nupowabel.rf.gd/30720859014.pdfIn PDF document text
    • https://s3.amazonaws.com/gomaxod/the_real_book_of_real_estate_by_robert_kiyosaki.pdfIn PDF document text
    • http://zidaposiwogo.rf.gd/gutachtenstil_aufbau.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/fazejiwa.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_off0000ea45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA45 5148 bytes
SHA-256: ae79857b9df025bddb5306c721f0393564fcee5e5edc750e159f1ef03da2ca04
font_01_sfnt_off0000fbab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAB 11096 bytes
SHA-256: 40fa0e457411ded77cffd716ce7f950199db4b9c258d1a254de91b39b3faec31

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