Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab44d52cd790c7e9…

MALICIOUS

PDF

77.6 KB Created: 2021-04-25 14:04:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 38dd94097b06d92d7737253dd85017e6 SHA-1: 5275ee51f667f70e8a43e3d405b27c25f40596f0 SHA-256: ab44d52cd790c7e97bab4dd5a43e6ab8772165415db05263bb6f5dbf80c5cd16
156 Risk Score

Malware Insights

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

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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.
  • 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://xajibur.ru/strik?utm_term=program+samsung+blu+ray+remote+ak59 PDF link annotation
    • http://xagakojitogiva.getenjoyment.net/ecology_and_environment_pd_sharma.pdfIn PDF document text
    • http://wopexobow.mywebcommunity.org/international_accounting_standards_24.pdfIn PDF document text
    • http://duverupabig.22web.org/frederick_copleston_history_of_philosophy_volume_2.pdfIn PDF document text
    • http://lunatan.medianewsonline.com/15889041446.pdfIn PDF document text
    • http://baramijotafexo.mypressonline.com/polishing_single_stage_urethane_paint.pdfIn PDF document text
    • https://cdn.sqhk.co/jogekiluse/hiujj2O/26885044753.pdfIn PDF document text
    • https://cdn.sqhk.co/favejofu/jjYiaib/plant_diary_template.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tinezedu/how_much_for_logo_design_india.pdfIn PDF document text
    • http://sadorebudinazu.epizy.com/dibijaxarefilu.pdfIn PDF document text
    • https://436c154b-1c2d-4c60-9768-ed3a268ef5e1.filesusr.com/ugd/e8e253_bb1391f8de704293bee233a39cfb4ee0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/rockstar_social_club_gta_4_pc.pdfIn PDF document text
    • http://vorisenunajix.myartsonline.com/adobe_acrobat_standard_or_professional_for_editing_files.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/wefitunutoxekol.pdfIn PDF document text
    • http://jabulimoj.rf.gd/brian_weiss_libros_en_espanol.pdfIn PDF document text
    • https://s3.amazonaws.com/tojabixefova/counseling_progress_notes_template.pdfIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/positive_thinking_quotes_for_today.pdfIn PDF document text
    • http://nutonujisebife.epizy.com/karaxurebex.pdfIn PDF document text
    • https://3315be42-5dab-4b6e-b44d-105cb490973e.filesusr.com/ugd/2e3488_268f0b69f0a8452ca60c0391005a587c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gosete/rilofinavun.pdfIn PDF document text
    • https://s3.amazonaws.com/nopomewegobij/all_types_of_affidavit_format_in_marathi.pdfIn PDF document text
    • https://s3.amazonaws.com/sikuva/how_many_mock_exams_cfa_level_3.pdfIn PDF document text
    • http://dixediw.epizy.com/86391366106.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_off0000ef92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF92 5592 bytes
SHA-256: 5881930aeb63dbbee1ef0ba98366c53b1c9739820f27060f033ad27db10c9bc6
font_01_sfnt_off0001028e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028E 10668 bytes
SHA-256: 772a94588e56dfc5fdafcf66addc674c900eae2dd8653155c681904fa77fe2fb

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