Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a3bd3f3fc92acd9…

MALICIOUS

PDF

82.8 KB Created: 2021-05-13 05:06:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa1c62973c7e7274193682688f77b06a SHA-1: 242ae8445bb3e9c854dd8b5236dfbcc1b571f00d SHA-256: 3a3bd3f3fc92acd964999a0fa318f4bf86193fd0c6e7363ef46e81c93174f148
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, containing numerous external URLs pointing to other PDFs. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or SEO spam. The embedded URLs suggest an attempt to redirect users to potentially harmful content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://zajinet.ru/strik?utm_term=metamorphosis+meaning+in+urdu
    • https://cdn.sqhk.co/nuzinipaz/hdxNFje/98309655239.pdf
    • http://lifelalulenomip.mygamesonline.org/professional_bodybuilding_workout_chart.pdf
    • https://vixixufabajuwe.weebly.com/uploads/1/3/1/1/131163632/71a5992b0c2.pdf
    • http://joxitikoki.getenjoyment.net/92213029459.pdf
    • https://sovonasu.weebly.com/uploads/1/3/1/4/131407222/fobemipekugamak.pdf
    • https://tumenunomowet.weebly.com/uploads/1/3/0/7/130775025/xukewugomas-nozapilasebev.pdf
    • http://josumewemuzob.getenjoyment.net/analyse_and_evaluate_the_selection_and_recruitment_of_judges.pdf
    • https://redobalopubijav.weebly.com/uploads/1/3/1/3/131380120/521e2021000fa.pdf
    • https://tewawabuse.weebly.com/uploads/1/3/1/4/131437503/7a75a73f.pdf
    • http://riniwodifole.medianewsonline.com/introductory_mathematical_analysis_textbook_solution_manual.pdf
    • http://mevatupumave.22web.org/rozumivevixodivowowis.pdf
    • http://sadogiropi.mypressonline.com/animal_farm_chapter_1_questions.pdf
    • http://jamotovoxut.mywebcommunity.org/atrial_fibrillation_guidelines_2020.pdf
    • https://cdn.sqhk.co/wuwoxegolewa/ggbhhja/54631417824.pdf
    • https://bixaguvukimub.weebly.com/uploads/1/3/1/8/131872105/juvezu_zuretado.pdf
    • http://fuzuwozozat.mypressonline.com/categories_of_application_software.pdf
    • https://cdn.sqhk.co/dabebasavus/hhjNKgi/cable_size_calculator.pdf
    • https://ragesetenavuxom.weebly.com/uploads/1/3/1/6/131606186/fowido_wunuvobubas_sumebokifini.pdf
    • https://dapemoko.weebly.com/uploads/1/3/4/6/134647299/zetegufetixa_xofakubizujipo_fupefafowitovi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://navumuj.rf.gd/posthumanism_in_literature.pdf
    • http://wepikupovug.myartsonline.com/lavumewafifinudetuz.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef5c.bin
806cf9f24b4d8ff0b9e772e301a1f3469fae824930f0ff053413f817ffc73431		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5C 5348 bytes
font_01_sfnt_off00010169.bin
1867abe6e0c9ded242393abcfb1a916ac7a98af91d73b10aba08bb9e14466b3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10169 10248 bytes
font_02_sfnt_off000124c0.bin
3e8757e064f42331d48c54888cec68bace06b1c5eb09e2b8eae7cf28d7ef8b91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124C0 17140 bytes

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