Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b0fbc4e4e4c0ea0…

MALICIOUS

PDF

83.1 KB Created: 2021-02-25 01:22:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 7941cbbda16e465f88c454eaa0b1cc8d SHA-1: 89eb78cf388c879b7590443219765545d3dcf136 SHA-256: 2b0fbc4e4e4c0ea084e87ed77dd4a0f290db7c7e90abc5500a08ddd175bb4678
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 or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a lure to external malicious content, likely for phishing or to download further payloads.

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://bologen.ru/wix?keyword=systems+of+linear+and+quadratic+equations+worksheet+kuta PDF link annotation
    • http://gemubanabugawa.mypressonline.com/best_book_for_gate_mechanical_engineering_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386330/normal_60349147a6b89.pdfIn PDF document text
    • https://vumerajijo.weebly.com/uploads/1/3/2/8/132815742/sudub_kisowune_varevif_relegov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467298/normal_5fe972fa312fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476930/normal_5fd1b9c30b9d2.pdfIn PDF document text
    • https://xapawijumoj.weebly.com/uploads/1/3/1/3/131379373/letawimurawoguz.pdfIn PDF document text
    • https://sefomaxezaniv.weebly.com/uploads/1/3/1/4/131483109/zaluxe-faxelaremagurix.pdfIn PDF document text
    • https://pafirolexorawu.weebly.com/uploads/1/3/4/6/134612045/vupukegebisida.pdfIn PDF document text
    • http://fefiwizam.sportsontheweb.net/what_does_f21_mean_on_a_maytag_4000_series_washer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408335/normal_60009e9e59aff.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tisudaxutuz.epizy.com/microsoft_access_crackeado.pdfIn PDF document text
    • https://s3.amazonaws.com/jimugivos/73038178500.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/14716419985.pdfIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/greensleeves_easy_violin_sheet.pdfIn PDF document text
    • http://vilepobafomunow.atwebpages.com/1386436728.pdfIn PDF document text
    • http://vimixof.onlinewebshop.net/domufi.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2A 5748 bytes
SHA-256: 30ef56a1f0dfddb7ab4531475df434f0455574b7a9dca6dc685c1ffe5fa40b18
font_01_sfnt_off0000fea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA9 12264 bytes
SHA-256: 6b1b81b656cd384193f10289bab9199087365a2b815b4dfb43c083861953ec7d
font_02_sfnt_off00012871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12871 16028 bytes
SHA-256: 3e66ce8c90719045bf8f6c8d5f716325bbce29c89c8399c9e71e7e90b46a9b16

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