Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d3491262835d952…

MALICIOUS

PDF

78.2 KB Created: 2021-05-08 13:31:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e5ff710437fd6bf4465931ecbbc574ee SHA-1: 2b9eca8ad167b2126f162d55f590d60dd7656593 SHA-256: 4d3491262835d95269edad3b1299fdbc7c67bd8ea738de61212a2f16c4d7dfc5
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with a primary focus on a link to 'baarspo.ru'. This URL, combined with heuristics indicating a link farm on disposable hosting and a high ML classifier score, strongly suggests a phishing or malware distribution attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' further solidifies this assessment. No scripts were extracted, but the document's structure and URL usage point towards an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/strik?utm_term=what%2527s+a+2+3+zone+in+basketball PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4370265/normal_600111093517d.pdfIn PDF document text
    • https://giligigava.weebly.com/uploads/1/3/4/4/134494785/1628532.pdfIn PDF document text
    • http://bajifepeselok.sportsontheweb.net/adjoint_of_3x3_matrix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385859/normal_603528028528c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412899/normal_5fddf6d3c31ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483331/normal_601d969b2e028.pdfIn PDF document text
    • http://bexixibeguben.sportsontheweb.net/oxford_picture_dictionary_second_canadian_edition_english_chinese.pdfIn PDF document text
    • https://sexuviruzimi.weebly.com/uploads/1/3/2/8/132814305/nojodakekukevar-zogiribosed.pdfIn PDF document text
    • https://wifenawejiwatu.weebly.com/uploads/1/3/4/8/134879118/6592792.pdfIn PDF document text
    • https://wuxelulomevadi.weebly.com/uploads/1/3/4/9/134904547/62244.pdfIn PDF document text
    • http://tufurujepuduxop.22web.org/biscuit_recipes_south_africa.pdfIn PDF document text
    • http://fisuruwibowin.66ghz.com/bafuboza.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494875/normal_60053b190f784.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vidodelogedotub.epizy.com/rosezobavasafesub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8b6c82c-574d-4951-ba71-1d869ad2e56c/system_analysis_and_design_5th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d027c115-1d1b-4c0a-9386-5a847ae08517/online_iso_9001_internal_auditor_training.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06ae6849-46f5-438b-b6ca-5a28d0a4555e/introduccion_programacion_neurolinguistica.pdfIn PDF document text
    • http://taxisariwoboduz.epizy.com/55065015264.pdfIn PDF document text
    • http://lurarapekakaka.atwebpages.com/anemia_macrocitica_hipercromica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1accd104-4080-466e-871a-72dfa9f1c995/what_is_the_hunger_games_catching_fire_book_about.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_off0000f6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DE 5276 bytes
SHA-256: 0c82fbeb7674d1886c8d97b1a3a4f95b16de9c2adf77e41ac76308badf75f615
font_01_sfnt_off000108ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EA 10088 bytes
SHA-256: 4edb804106f8e0105d7bf0bb7bec55022bb78bab6017f2d11311e359e7e6989c

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