Malicious PDF — malware analysis report

Static analysis result for SHA-256 b681a4a94f65b106…

MALICIOUS

PDF

79.8 KB Created: 2021-03-28 21:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 7246a77a33ce482b7a122ae274023a98 SHA-1: 9abe75e82f35f337236964df547032762d3f9931 SHA-256: b681a4a94f65b106820824ae6b50e87b3d5f6891a78ac5cfd1871a28f15d07db
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xajibur.ru/strik?utm_term=what+is+genetic+predisposition+in+psychology PDF link annotation
    • http://komarovskii.xyz/libros_blog_del_fotografoqhest.pdfIn PDF document text
    • https://kuwumezebuxe.weebly.com/uploads/1/3/4/1/134131528/kixubaraxa_lufibipibig.pdfIn PDF document text
    • http://zajakewezu.iblogger.org/sensory_evaluation_of_milk.pdfIn PDF document text
    • http://tesocoin.online/73268806607hsr23.pdfIn PDF document text
    • http://reduslim-officialsite.site/public_administration_definitionws4gr.pdfIn PDF document text
    • http://onlinetyz.xyz/spelling_connections_grade_5_unit_9_answerstju3m.pdfIn PDF document text
    • http://idealica-official.website/breville_juicer_recipesov8q1.pdfIn PDF document text
    • https://kujedoduzenawo.weebly.com/uploads/1/3/0/7/130776750/8692202.pdfIn PDF document text
    • http://duplicwcnj.space/pinball_space_cadet_download_macos8tw.pdfIn PDF document text
    • http://wirodapupoz.iblogger.org/17679443114.pdfIn PDF document text
    • http://natur-green.fun/262406368756cx5v.pdfIn PDF document text
    • http://rollernefrit.xyz/botadedako0bxwy.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/d41b6f69-6ac1-411f-8cd0-511c92943164/vopajoxesav.pdfIn PDF document text
    • http://fataragoreb.myartsonline.com/gurawexesuwusotefowis.pdfIn PDF document text
    • http://zininorenedalo.onlinewebshop.net/american_english_file.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de2e554b-28b2-4f25-862c-1ad9051dc959/indian_restaurant_kitchen_equipment_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41c161eb-da7c-414d-a6be-fe21e4361b10/cules_son_las_enfermedades_que_califican_para_el_ss.pdfIn PDF document text
    • http://bipeditoderodud.epizy.com/radial_engine.pdfIn PDF document text
    • http://memaded.epizy.com/61457789589.pdfIn PDF document text
    • http://momoxorepuvo.epizy.com/what_is_the_cosmic_secret.pdfIn PDF document text
    • http://bakakixutuv.myartsonline.com/3467970935.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_off0000f8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BA 5452 bytes
SHA-256: 6e6f1d6a78885c935f29b0b3b96c66279f23002fb6e2f8edb55881d9db3f2f5c
font_01_sfnt_off00010b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4F 10780 bytes
SHA-256: e3138aba3df917b1c4405d7544c6bb647e49c2791d5128a494b1b70ac810854f

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