Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac1f14b75a5f37ff…

MALICIOUS

PDF

78.5 KB Created: 2021-03-06 15:54:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 8d070354a71096114c35e2d91834d965 SHA-1: 88a90637ec47ba398efd69ecfef2b435fea618c7 SHA-256: ac1f14b75a5f37ff26bf93b3318e51aa9825942162eca0b413b488db4280f51e
106 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document contains numerous links to external websites, many of which appear to be part of a link farm hosted on disposable domains. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content likely prompts the user to install a browser extension or update. This, combined with the external URLs, suggests a social engineering attack aimed at tricking users into downloading malicious software or revealing credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://fokemale.ru/award?keyword=audio+mixing+and+mastering+software+free+download PDF link annotation
    • http://bomaduworofa.medianewsonline.com/45093355245.pdfIn PDF document text
    • http://criticcxck.space/premiere_pro_free_download_for_windows_7_32_bito59l7.pdfIn PDF document text
    • http://rudajudo.iblogger.org/selenium_with_java_tutorial_point.pdfIn PDF document text
    • https://cdn.sqhk.co/totudavomud/Y2sHjf1/82288002127.pdfIn PDF document text
    • http://insuranceautousa.com/69534286001pbs0g.pdfIn PDF document text
    • https://cdn.sqhk.co/rorajakura/bicKjgv/dufomo.pdfIn PDF document text
    • http://nomuvafemokin.iblogger.org/freemake_video_er_for_macbook_pro.pdfIn PDF document text
    • http://gazzsheff.xyz/the_stranger_netflix_quick_summary71zmh.pdfIn PDF document text
    • https://cdn.sqhk.co/mesafovojifo/KHk8gd5/roku_stock_earnings_report_date.pdfIn PDF document text
    • http://mosdendy.store/what_is_the_best_way_to_sharpen_chainsaw5typo.pdfIn PDF document text
    • http://cmbespaceclient.xyz/mechanical_engineering_salary_per_month_in_ghanaj1fur.pdfIn PDF document text
    • https://cdn.sqhk.co/libuzewis/ccJNigc/keylead_pty_ltd.pdfIn PDF document text
    • http://housefashion.ru/spider_man_3_game_for_ppsspphlo41.pdfIn PDF document text
    • http://janorewaxeno.mygamesonline.org/mujobijebusad.pdfIn PDF document text
    • http://mobeditobaxul.scienceontheweb.net/huckleberry_finn_summary.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jevelel/weekly_planner_template_with_hours.pdfIn PDF document text
    • http://tigapoxo.rf.gd/julusanaxajilepigapewu.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/dimesusubo.pdfIn PDF document text
    • http://zotubune.myartsonline.com/baxugowejarizexi.pdfIn PDF document text
    • http://mepumubim.rf.gd/kdigo_guidelines_post_transplant.pdfIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/84720811513.pdfIn PDF document text
    • https://www.cancer.gov/coronavirusIn 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_off0000f596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF596 5376 bytes
SHA-256: 697a9c35ed24e17e7aee1aca2b83a8a4b3a37e6334b16ce29d650f27e83574e3
font_01_sfnt_off000107dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DD 10720 bytes
SHA-256: 616cf664cab8d5c76a9360db080e044a9c0b2bfd49cdd40f0f6f53294fdeb0ba

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