Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4ea5c30d8b5a1a9…

MALICIOUS

PDF

76.1 KB Created: 2021-05-01 21:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ae7a2319e202f7d0609abd8967359fd9 SHA-1: 86e7c599c8af17b9231bfc074b3158a2d7f522c5 SHA-256: c4ea5c30d8b5a1a908af81b375ddafab8f327c34ca08f98402366813e770c80c
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are likely part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of a URL with a 'utm_term' parameter suggest a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a malicious site for further exploitation.

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://vilenefex.ru/strik?utm_term=how+to+call+better+business+bureau PDF link annotation
    • http://zexaribamemavi.sportsontheweb.net/dadikudekam.pdfIn PDF document text
    • http://gepokupaburorew.mywebcommunity.org/bbc_compacta_class_11_english_solutions.pdfIn PDF document text
    • http://zisuroto.mygamesonline.org/wiwasuf.pdfIn PDF document text
    • https://sujujawajiz.weebly.com/uploads/1/3/5/9/135964945/888550c8.pdfIn PDF document text
    • https://bopidojosonek.weebly.com/uploads/1/3/1/3/131384153/gotelinesusip.pdfIn PDF document text
    • http://sitebomobegux.sportsontheweb.net/agenesie_du_corps_calleux.pdfIn PDF document text
    • http://gegetibobiduvud.iblogger.org/65548641068.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f8d0f22-0cb3-4f81-a507-a9ec2e9ba9c0/how_many_calories_in_a_frozen_mocha_coffee_from_dunkin_donuts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffe1639e-c4e7-4ad2-bcad-cef5771bdf2f/how_to_cook_chicken_breast_in_power_cooker_plus.pdfIn PDF document text
    • http://tokivatifizaxe.rf.gd/niv_bible_free_download_for_pc.pdfIn PDF document text
    • http://bizivedigudo.epizy.com/66544445708.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/zutosejejobimevonu.pdfIn PDF document text
    • http://rofuvawitarul.atwebpages.com/4026558158.pdfIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/anil_kapoor_nayak_movie.pdfIn PDF document text
    • http://pozenejuz.rf.gd/nupizu.pdfIn PDF document text
    • http://gulizut.epizy.com/tiraloloravazob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c03d5bc-e6ca-4add-a489-bd3234017d3e/power_pressure_cooker_xl_whole_sweet_potatoes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83504aa3-f15c-41ae-b7a9-0f1b91db5249/63352724083.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/grade_1_worksheets.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_off0000ece7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE7 4984 bytes
SHA-256: ec48ebbf46d363986ef64099492abc0795f5367338a0e48654dde670224d5a04
font_01_sfnt_off0000fdf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF6 10864 bytes
SHA-256: d1600a92769ff3845c1ac39d38892d37143a9694cebac7cd63b316657da26bfa

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