Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca687ac39c12cd80…

MALICIOUS

PDF

83.5 KB Created: 2021-04-20 21:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3cbf1235c7c866c75f9df21d4136b998 SHA-1: e6f223498348fd4502ba09fb307357b39720f3cc SHA-256: ca687ac39c12cd80976b721738d452b8bf769490c1d5439a05cdfb6ca97234f4
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=scientific+method+lab+activity+middle+school In PDF document text
    • http://juraxoxodas.scienceontheweb.net/94926772623.pdfIn PDF document text
    • https://cdn.sqhk.co/nejisakatok/hbG2fhG/super_dragon_ball_heroes_world_mission_deck_arcade.pdfIn PDF document text
    • https://cdn.sqhk.co/ropulufira/jLwGvid/fevodebuvonududazov.pdfIn PDF document text
    • http://kulotufiw.mypressonline.com/47016269139.pdfIn PDF document text
    • http://energierecrute-emplois.com/pathfinder_roleplaying_game_advancedc5f6o.pdfIn PDF document text
    • https://cdn.sqhk.co/zevijevam/jd7b9gd/spinning_a_fidget_spinner_for_24_hours_straight.pdfIn PDF document text
    • https://cdn.sqhk.co/fonizijodi/jbgiieO/pofupimolofe.pdfIn PDF document text
    • http://sportita.fun/masters_industrial_systems_engineering_salarybix7k.pdfIn PDF document text
    • http://reduslim-italy.site/what_are_the_stages_of_agile_methodologyiqy0u.pdfIn PDF document text
    • http://vowewudimo.mypressonline.com/batogeja.pdfIn PDF document text
    • http://tijudozi.scienceontheweb.net/zavaxegepogu.pdfIn PDF document text
    • https://cdn.sqhk.co/nupasoxure/jgmZ4gd/poached_eggs_in_oven.pdfIn PDF document text
    • http://dress-russia.ru/judicial_branch_scavenger_hunt_answerslw875.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef69384b-154c-4c66-8008-4d22aa1ddbb3/how_to_start_kettlebell_training.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/maggie_a_girl_of_the_streets_summary_chapter_2.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/chocolate_mousse_cake_nutritional_information.pdfIn PDF document text
    • https://s3.amazonaws.com/rurovikejigibu/corrugated_polycarbonate_sheet_singapore.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/guwifenezono.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/285c5843-57d5-42fd-8611-a2fd2644c28f/descargar_curso_de_guitarra_acustica_gratis.pdfIn PDF document text
    • http://nejotuwusa.rf.gd/adapted_physical_education_and_sport.pdfIn PDF document text
    • http://xovefopu.myartsonline.com/57236400446.pdfIn PDF document text
    • http://kikameruvof.epizy.com/counterparty_credit_risk_and_credit_value_adjustment_gregory.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_off00010b53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B53 5568 bytes
SHA-256: 461ddd6969b8151c5c6232abe82cd6cf7218639a2f6ebbd4272ab152ebe4d8fb
font_01_sfnt_off00011e2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2D 10036 bytes
SHA-256: e17b30b9bab50f12582813dfcb0210eb08f42865097b71cfac469ecd3cab47fd

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