Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8228362995f0f94…

MALICIOUS

PDF

86.6 KB Created: 2021-04-10 10:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 5eddaca2ea6ec7b98e865db2667da8a3 SHA-1: 28787818c414ba06a13e033e36552b7266f37771 SHA-256: c8228362995f0f9478a6c1300e3f94caf10e665274251c57fa8201220d7805a0
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://mezovuduw.ru/strik?utm_term=2010+ford+mustang+gt+premium+convertible PDF link annotation
    • https://cdn.sqhk.co/pumevigatare/je2id7R/samsung_level_box_pro_bluetooth_speaker.pdfIn PDF document text
    • http://rexevivejegox.scienceontheweb.net/symbolic_interactionism_in_sociology_of_education.pdfIn PDF document text
    • http://tovelksa.website/236981270469lar3.pdfIn PDF document text
    • http://gumidaz.medianewsonline.com/72803937200.pdfIn PDF document text
    • https://cdn.sqhk.co/lakuziwi/hajhyhe/diskdigger_photo_recovery_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/giganopof/mgjjhgc/6358514746.pdfIn PDF document text
    • http://all-casino.xyz/libro_el_poder_de_la_esposa_que_ora_descargar_gratiswlaqi.pdfIn PDF document text
    • https://cdn.sqhk.co/bozadukopufu/4ieKgf8/spiritfarer_wiki_stanley.pdfIn PDF document text
    • http://pshcomonhere.xyz/what_is_considered_general_dentistrylqalf.pdfIn PDF document text
    • http://bisibometixo.mywebcommunity.org/26979725249.pdfIn PDF document text
    • http://vsedlyatebya.xyz/probability_and_statistics_high_school_textbookg1dhk.pdfIn PDF document text
    • http://suvekitubexeso.getenjoyment.net/pic_assembler_tutorial.pdfIn PDF document text
    • http://xirapanagix.getenjoyment.net/76831451410.pdfIn PDF document text
    • http://dexuposi.sportsontheweb.net/wuxigorezozunoxawogu.pdfIn PDF document text
    • https://cdn.sqhk.co/pepegejivo/2ghwhfL/art_therapy_groups_melbourne.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://def26600-86c9-4442-a738-094ddf2992d1.filesusr.com/ugd/eb5a6a_385a5311f8bc4603847ed1e3fc171d01.pdf?index=trueIn PDF document text
    • https://8eb0ff2f-1b5f-41fb-a82b-bf279dc7f43e.filesusr.com/ugd/868f76_1c5bc30501dc4c25b9cd3019123a9234.pdf?index=trueIn PDF document text
    • http://rosajeku.myartsonline.com/nofuduv.pdfIn PDF document text
    • https://5e20aa6b-77ef-4f11-9344-5454fb7c649c.filesusr.com/ugd/fb3aa9_f22ec461476a433aaeebe9aff15bb928.pdf?index=trueIn PDF document text
    • https://7f58a6d3-5723-489e-a2bd-17fd91e1ddd5.filesusr.com/ugd/655495_1b4c72eea4db42e388e4927b0704370c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d2d23bb-a626-4d12-8de2-8b9642131f65/73845225389.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/471b4d20-2d7d-4ca9-9299-54897e372529/the_crucible_act_3_study_questions_worksheet.pdfIn PDF document text
    • http://fanalejowegop.atwebpages.com/apologetic_theology.pdfIn PDF document text
    • https://fb4bdcd3-28a3-4206-a6c3-fb267f511c23.filesusr.com/ugd/0ad562_04aced22a0ca46419beb07d207a631c3.pdf?index=trueIn PDF document text
    • http://kakasis.onlinewebshop.net/dasoxopusonagovij.pdfIn PDF document text
    • http://jabejanaboz.atwebpages.com/suwevekomabidefitedano.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_off00011209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11209 5908 bytes
SHA-256: c2fd35ac9bed1f8c1bb239e3f2465a1788905ca959393ab9844b96969e40f593
font_01_sfnt_off0001261c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1261C 11180 bytes
SHA-256: 951b31df474ac417929b53a89383f16e3201ed1fc5dbcfc4ac8c405c390c9c79