Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fc19a437d1b0bc9…

MALICIOUS

PDF

73.2 KB Created: 2021-02-27 22:41:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 54f95571b9c7057157cc815f0677e42c SHA-1: 655d73f9b41b68773ddc47fa5de42aea092143e1 SHA-256: 0fc19a437d1b0bc98d9cf287044f11417ff836392e1dea85ae9c5552361b52cf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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/strik?utm_term=what+is+pe+error+in+lg+washing+machine PDF link annotation
    • https://polovetanofup.weebly.com/uploads/1/3/5/3/135330247/1790169.pdfIn PDF document text
    • https://walipovagotil.weebly.com/uploads/1/3/6/0/136016519/301638.pdfIn PDF document text
    • http://mokaxizekebade.scienceontheweb.net/amusing_the_million_download.pdfIn PDF document text
    • http://zesabekuziwuga.iblogger.org/buku_akuntansi_keuangan_menengah_berbasis_psak.pdfIn PDF document text
    • http://narelavupes.22web.org/school_year_calendar_template_2019-_20.pdfIn PDF document text
    • https://lezanixopedem.weebly.com/uploads/1/3/4/8/134886347/7546928.pdfIn PDF document text
    • http://mebovedu.getenjoyment.net/is_learning_python_useful_for_finance.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fetekovabu.onlinewebshop.net/usul_al-fiqh_in_urdu.pdfIn PDF document text
    • http://tavamikilav.myartsonline.com/why_is_my_electric_fence_beeping.pdfIn PDF document text
    • http://maxefaronuxugur.epizy.com/direct_vs_reported_speech_ppt.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxirefare/cat_2019_notification.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/the_story_of_keesh_answer_key.pdfIn PDF document text
    • http://gixulomo.rf.gd/what_is_the_electron_geometry_of_sf4.pdfIn PDF document text
    • http://bifiwapaz.onlinewebshop.net/ranobok.pdfIn PDF document text
    • http://xowobovu.myartsonline.com/soundcraft_ui_12_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/microsoft_excel_2013_free_download_with_product_key.pdfIn PDF document text
    • http://kevitokepe.epizy.com/the_man_who_couldnt_stop_the_truth_about_ocd.pdfIn PDF document text
    • http://pusapovewazigu.onlinewebshop.net/xosexajoropidifubafiwur.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_off0000e108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE108 5452 bytes
SHA-256: 9cf6eec277df7373ee2db25e1bd391c6b697ee34cc894d22da617f0baf574a9b
font_01_sfnt_off0000f381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF381 10748 bytes
SHA-256: 745202478d084c4ee58fac86a75c103cbcced7f903432b3eb588f8173876829b