Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6d02fde22773aac…

MALICIOUS

PDF

71.8 KB Created: 2021-02-05 18:55:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: ed3b846ae7b0f123c9d1dedb237caf31 SHA-1: d0dcdb54fd9a37540209446ace8184045953fd2b SHA-256: d6d02fde22773aacbbe55deb5b10b0ae778a61eb11f770d29e279c85ca642c9f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, many pointing to disposable hosting or link farms, suggesting a phishing or malware distribution scheme. The presence of 'utm_term' parameters in some URLs further supports a campaign-driven lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious 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://bologen.ru/123?utm_term=hydronium+ion+concentration+calculator PDF link annotation
    • https://cdn.sqhk.co/gobavata/9ji9uii/prison_break_characters_season_3.pdfIn PDF document text
    • https://cdn.sqhk.co/widafopaj/jG12cjf/events_this_weekend_in_ct.pdfIn PDF document text
    • http://futegejetebe.22web.org/latest_audio_songs_punjabi.pdfIn PDF document text
    • https://pukakiliratof.weebly.com/uploads/1/3/4/7/134768090/gimev.pdfIn PDF document text
    • https://cdn.sqhk.co/tefulobesa/ieb0hiX/83009869743.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476567/normal_5fca213739536.pdfIn PDF document text
    • http://fokikizuxijem.iblogger.org/jiputedapizasapep.pdfIn PDF document text
    • http://mefizilexofe.66ghz.com/companies_house_register_of_members_template.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454995/normal_5fd1f2e597627.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460954/normal_6014821eab923.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423154/normal_5fc8f911380f4.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/laradusa/xasupagorepomaki.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/arma_3_non_steam.pdfIn PDF document text
    • http://buxebawimiro.epizy.com/chicken_noodle_soup_mp4.pdfIn PDF document text
    • http://sukilik.epizy.com/website_accessibility_checklist.pdfIn PDF document text
    • http://jirudef.epizy.com/beauty_camera_free_for_iphone.pdfIn PDF document text
    • http://jepogedepujadul.rf.gd/bolt_cutter_rivet_tool_template.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/sherlock_holmes_season_4_with_subtitles.pdfIn PDF document text
    • http://tifumego.rf.gd/pdf_file_format_name.pdfIn PDF document text
    • http://lumigetutiburu.epizy.com/53771259090.pdfIn PDF document text
    • http://retetopipazaned.epizy.com/ct_coronary_angiogram_nice_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/19180939271.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_off0000d826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD826 4968 bytes
SHA-256: 23787a7912779175501e8e552682a05cecab94b4555c343349d5f48cdeb10285
font_01_sfnt_off0000e8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F9 11852 bytes
SHA-256: 6b12cc0028f68dbfe0c7d765eaaec52ee08bb6b2ebe0430cf01a07e66ac4319e

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