Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea8149471b5afbda…

MALICIOUS

PDF

89.4 KB Created: 2021-04-05 18:23:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 78f062c83a12d9d71caff971591ad760 SHA-1: 7ffdb97138782000ab36865ace7b29cf094881fe SHA-256: ea8149471b5afbdacaea780e24313cbbeac834d13579f60c094b3b61a4972036
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs hosted on disposable domains, suggesting a tactic for SEO manipulation or distributing phishing content. The presence of multiple external links and the detection as a 'Phishing.Trojan' strongly suggest the document is designed to lure users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • 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://nipisod.ru/strik?utm_term=star+wars+trivia+quiz+factory+answers PDF link annotation
    • http://teposiliza.22web.org/archery_master_3d_game_unlimited.pdfIn PDF document text
    • http://fudilumow.22web.org/programa_aprendizajes_clave_educacion_fisica.pdfIn PDF document text
    • https://cdn.sqhk.co/bisulalu/cx63MDN/93312443506.pdfIn PDF document text
    • https://tatidadimu.weebly.com/uploads/1/3/5/3/135383915/pezalavunagasaz-xopoxot-guritajetal-pinekepa.pdfIn PDF document text
    • http://vamekujo.66ghz.com/incident_report_template_document.pdfIn PDF document text
    • https://cdn.sqhk.co/wixexozesila/jxkBiaB/toy_airplane_flight_simulator_online.pdfIn PDF document text
    • https://xijofufakeziti.weebly.com/uploads/1/3/1/3/131380729/jefototuwezo.pdfIn PDF document text
    • https://goluluvofa.weebly.com/uploads/1/3/2/7/132712214/d6146382e8f92.pdfIn PDF document text
    • https://tutusilubejisev.weebly.com/uploads/1/3/4/5/134599447/zokonifojebilolalon.pdfIn PDF document text
    • https://cdn.sqhk.co/temirikuji/JOgiiih/free_slots_machine_games_to_play_for_fun.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/e203956e-0f08-4d73-803d-db1b0d324fd0/sense_and_sensibility_chapter_19_summary.pdfIn PDF document text
    • http://rurejotalovulu.rf.gd/is_15_knots_ok_for_boating.pdfIn PDF document text
    • https://9c3086b9-336b-4a4d-b39c-975a2563a2e0.filesusr.com/ugd/f4f792_b1a018834acc4ef6b16d0c2908c40de5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9fc8604-8455-4594-8d45-fd117fa56d70/the_shining_cast_1980.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/539ae751-06cb-4c33-aa3b-6aecf4e3234d/what_prefix_multiplier_is_appropriate_for_reporting_a_measurement_of_5.57_105_m.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df877194-0b8d-42ee-8c57-9b4469e7b704/pevopabilizowowazifafiv.pdfIn PDF document text
    • http://wixuvixur.rf.gd/lijixusoluzonovadajam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16e177cc-3a14-4e29-a6af-80208a8db2b8/65139108460.pdfIn PDF document text
    • https://8772a198-af03-49ef-8724-5feb7546cb8a.filesusr.com/ugd/436f04_9dd8a5b107154b2aaf82b23fe7a83e44.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc53885d-5857-445a-b6c8-f3cbc7259cce/4300976854.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a517307-9b2c-48d7-b697-fa84fb47e315/27679831577.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_off00011c29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C29 5376 bytes
SHA-256: f9b06272c3cfd25e3bd2e11ff5d7bf18ed43a81e2f3211d0a7d349c56b0d3db6
font_01_sfnt_off00012ead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EAD 12128 bytes
SHA-256: 248cee6bc3062e45a1559058fd915d28bbf091479eeefb3f04360dde235b814f