Malicious PDF — malware analysis report

Static analysis result for SHA-256 2be8e4437a33e9a3…

MALICIOUS

PDF

71.9 KB Created: 2021-03-03 21:54:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f7e357d88832fe6979aa41cef4801b8b SHA-1: 343e30c40dd8b47707bb0d2670ba474bd2cef6cd SHA-256: 2be8e4437a33e9a33e9ed7c30fffe61de479a410c0356909ebb2f54bc65007ee
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, with heuristics indicating it functions as a link farm hosted on disposable domains. The embedded URLs suggest an attempt to redirect users to potentially malicious or phishing content. Although no scripts were explicitly extracted, the PDF format can embed JavaScript, which is often used to facilitate such redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zajinet.ru/wb?keyword=how%20much%20is%20premiere%20pro%20uk PDF link annotation
    • http://tipofeliluget.medianewsonline.com/15265327371.pdfIn PDF document text
    • http://usejus.club/malugakazolinu5wl0r.pdfIn PDF document text
    • http://qrettalq.online/best_tuner_for_mpg_6._0_powerstroke3m0uq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470221/normal_5fe0a8d29f96e.pdfIn PDF document text
    • http://opticsystem.website/43555009479xuv7g.pdfIn PDF document text
    • http://sujabupinoda.scienceontheweb.net/ejemplos_de_dialogos.pdfIn PDF document text
    • http://lumobumekola.getenjoyment.net/should_internet_be_capitalized.pdfIn PDF document text
    • http://gewututikame.getenjoyment.net/how_to_edit_a_png_in_inkscape.pdfIn PDF document text
    • http://floradoma.net/y8_games_bike_bmxmud3j.pdfIn PDF document text
    • http://worelimupuvefam.mywebcommunity.org/what_is_the_scout_motto.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gogujigasad.onlinewebshop.net/what_do_black_ants_mean_in_a_dream.pdfIn PDF document text
    • http://sutexuvidag.myartsonline.com/38841803073.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/tuwitobot.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_off0000d9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C7 5048 bytes
SHA-256: 4e41facdf6c548465fc29bebd611eeb2becfe3e9e72c42f75834c76f5b936961
font_01_sfnt_off0000eade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADE 12568 bytes
SHA-256: 0f0b98d3bab24500bcd67ce62dc0a0cc2a7ec5242213db1c2b04abeebcbbd7fa

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