Malicious PDF — malware analysis report

Static analysis result for SHA-256 130da7766e313c6d…

MALICIOUS

PDF

81.5 KB Created: 2021-03-24 16:14:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a872063569d3b52a7c157b696cce92f SHA-1: 299e1e12446864b4b8aadf83d3fd4a46362cb56d SHA-256: 130da7766e313c6dd463ee2d1f472eb563d1e634d0760f9d4ef6688b0a03041b
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to redirect users to potentially malicious sites. The presence of 'utm_term=best+online+shop+for+formal+dresses' in one of the URLs indicates a lure to attract users interested in shopping.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/123?utm_term=best+online+shop+for+formal+dresses
    • https://cdn-cms.f-static.net/uploads/4444644/normal_6023c6dd565ea.pdf
    • http://zuviferufudufa.iblogger.org/autodesk_autocad_lt_2016_manual.pdf
    • http://vabapagamowese.22web.org/news_report_plane_crash.pdf
    • http://bowejuponiwoz.iblogger.org/business_letter_example_for_a_company.pdf
    • http://electrumwallet.buzz/amazon_echo_dot_manualluv5z.pdf
    • http://dejivuxa.mygamesonline.org/90141689178.pdf
    • http://dipenoguzel.sportsontheweb.net/line_6_spider_v_120_vs_240.pdf
    • http://kanshoper.site/brunton_school_uniformykaza.pdf
    • http://dilawiputonu.mypressonline.com/head_first_lyrics_christian_french.pdf
    • https://static.s123-cdn-static.com/uploads/4454822/normal_600468697eff6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tuwutexo.onlinewebshop.net/composite_materials_types_properties_and_applications.pdf
    • http://wififeju.atwebpages.com/rororifadulufilux.pdf
    • http://nazewomufewe.rf.gd/apache_netbeans_windows.pdf
    • http://gebozobab.epizy.com/goxow.pdf
    • http://nudifezidezi.rf.gd/review_of_anatomy_and_physiology_of_female_reproductive_system.pdf
    • https://538d8494-0c7d-401a-b890-0485f6bc7bca.filesusr.com/ugd/29c71c_505a7192df2e4a75bc049cbfefe4eca8.pdf?index=true
    • http://bijiwamosijiw.epizy.com/gerovezibojopelisefoku.pdf
    • http://fafezevasuba.rf.gd/invitation_letter_for_visa_uk_template.pdf
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_962e93afc4fd4411a859594262cd90d5.pdf?index=true
    • http://lefabeku.epizy.com/boerewors_recipe_book.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001015d.bin
21e95e2041f5454bb182396c2256039eb492cd9c976296b47d7fdc1769da7c13
pdf-font-stream PDF embedded font (sfnt) at offset 0x1015D 5328 bytes
font_01_sfnt_off0001134a.bin
8b94141659de056ac5b36fcd43a9b0c3d25954dee0be781b42b23e7434cca00f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1134A 11012 bytes