Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2854ca0ccedf636…

MALICIOUS

PDF

75.3 KB Created: 2021-03-24 04:07:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 61c402de93284729d0ddfbf06bdd4957 SHA-1: e54bfa3652a57363f6f26cbce0d1168245a8b328 SHA-256: b2854ca0ccedf636c717944f7354542f12b580012230c207cb324b720e3a319e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely to obscure malicious destinations or for SEO manipulation. The presence of external URIs and the overall structure suggest this PDF is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://soxebez.ru/strik?utm_term=success+books+for+students PDF link annotation
    • http://segikusi.22web.org/workbook_for_introduction_to_composite_materials_design.pdfIn PDF document text
    • http://copyright-rules-help.com/42294931813x2kh3.pdfIn PDF document text
    • http://zosazufinur.mygamesonline.org/78608203500.pdfIn PDF document text
    • http://wunowixumofe.22web.org/banner_background_images_hd_1080p_free.pdfIn PDF document text
    • http://trycabinets.xyz/the_making_of_the_english_working_class_reviewlw2xh.pdfIn PDF document text
    • http://jobediniberine.scienceontheweb.net/maguwudod.pdfIn PDF document text
    • http://qrastenmap.online/98638307300gfpnv.pdfIn PDF document text
    • http://sunshop.pro/medidas_cautelares_innovativas_peru4rra7.pdfIn PDF document text
    • http://hushseo.online/29605018619yyeem.pdfIn PDF document text
    • http://xakidofe.sportsontheweb.net/2006_civic_service_light_reset.pdfIn PDF document text
    • http://sokuzise.iblogger.org/mastering_metrics_the_path_from_cause_to_effect_download.pdfIn PDF document text
    • http://malespw.xyz/3d_human_anatomy_models_freenziuj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zedebegeku.myartsonline.com/technical_drawing_textbook_for_secondary_school.pdfIn PDF document text
    • http://bizedesaxifu.onlinewebshop.net/impact_of_cashless_policy_on_nigeria_economy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7837c3ac-d28a-41f6-8cce-c8d242aa2953/whirlpool_refrigerator_water_filter_replacement_video.pdfIn PDF document text
    • http://subogerilazelo.atwebpages.com/cuadernos_digitales_aula_31.pdfIn PDF document text
    • http://najijojovigom.myartsonline.com/clinical_oral_implants_research.pdfIn PDF document text
    • http://xojudemavu.onlinewebshop.net/faliwulonimagowusufeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9d5a9eb-bf4d-4eb1-987e-de71d4860cc3/jupikifutit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f07157a-e51c-411b-a387-574e31e16f2b/where_can_i_donate_clothes_in_new_jersey.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_off0000ea59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA59 5080 bytes
SHA-256: 38f8d376cabb0d1964bbc98cab616f6f1e527a1568aafdbf46c441a1c34dcc72
font_01_sfnt_off0000fbb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB3 10700 bytes
SHA-256: 7695df4f3d70573446e30fa59767f9d37a7e6ccab55e49411579d0d05584b8dc

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