Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a009045ca9a1a12…

MALICIOUS

PDF

73.1 KB Created: 2021-03-14 11:50:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 53300fd5e0152168cccd6528bd4c0bb1 SHA-1: 77eb0258059c50fab1300f8794c807515d43950c SHA-256: 8a009045ca9a1a120f0149a05bf2959579cc1b4c44fbf2ddf45ec68eb802e7d9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to suspicious domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of the document being used to distribute malware or conduct phishing by linking to many disposable domains. Although no scripts were explicitly extracted, the presence of external URIs and the overall structure suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ponafet.ru/strik?utm_term=a+general+introduction+to+psychoanalysis+sigmund+freud+pdf PDF link annotation
    • http://grantmedica.ru/zemidhy3kv.pdfIn PDF document text
    • http://fastnoutservice.ru/readiness_for_enhanced_comfort_nursing_interventions91s9q.pdfIn PDF document text
    • http://avit0.cc/i_survived_the_shark_attacks_of_1916_picturescu3za.pdfIn PDF document text
    • http://masajsalonunuz.com/repetitive_information_meaningk0nsx.pdfIn PDF document text
    • https://cdn.sqhk.co/gilitejeku/p68UXhc/51675957861.pdfIn PDF document text
    • http://future-techno.ru/mechanical_engineering_internships_vancouver_wa9vdyf.pdfIn PDF document text
    • http://qlemelest.online/asp.net_mvc_tutorial_videos_free_download6wsp1.pdfIn PDF document text
    • http://sevesasineja.22web.org/adobe_reader_full_offline_installer.pdfIn PDF document text
    • http://goshop32.site/416859040730g2o.pdfIn PDF document text
    • http://wuxixezigitezir.mygamesonline.org/free_simple_land_purchase_agreement_form.pdfIn PDF document text
    • http://esclub.info/ford_focus_2003_engine_oilad14n.pdfIn PDF document text
    • http://sreview.online/nidozojutek3y0vm.pdfIn PDF document text
    • http://filfex.ru/jejonerowbusb4.pdfIn PDF document text
    • http://neuroncraft.online/quote_about_walkrda89.pdfIn PDF document text
    • http://edaruzal.xyz/tabla_abdominales_isometricos267k8.pdfIn PDF document text
    • http://supermagazforsale1.xyz/zivowosk5pl.pdfIn PDF document text
    • http://melofuwi.getenjoyment.net/76812138532.pdfIn PDF document text
    • http://bonifacy.site/predator_8750_generator_specsqb9ti.pdfIn PDF document text
    • https://cdn.sqhk.co/mogujawogo/gejjScm/jozurexaveb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fozozip.onlinewebshop.net/public_relations_books_download.pdfIn PDF document text
    • http://sobogefes.rf.gd/suvuvibesumidenaxux.pdfIn PDF document text
    • http://nenumagurebe.rf.gd/careless_whisper_remix.pdfIn PDF document text
    • http://vopobojadufej.rf.gd/memipizarevevereg.pdfIn PDF document text
    • http://wesokojoposad.epizy.com/lakeland_ledger_sports_fishing_report.pdfIn PDF document text
    • http://zivonupawidam.atwebpages.com/wusageloposexuf.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_off0000df4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4C 5660 bytes
SHA-256: 2eff816ed68256a84ec4d820680bfe8f315f57fb8d48ba66f8fc4cb16998498a
font_01_sfnt_off0000f26d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26D 10568 bytes
SHA-256: 7ed69cd8ee955658b0fc363cabcf4148bf2d78a4c58a5245407897bc6e8650ca

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