Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1f1db134718afd4…

MALICIOUS

PDF

76.4 KB Created: 2021-03-02 16:13:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 426edf8dc775e6a229b4a6ab9f9d8bba SHA-1: d2ef1103e1a74c9fa127151d6a8f3ff381b2bc0f SHA-256: c1f1db134718afd424d086b1e52a0b5197c7b90d28a7d3fc46692ec8aca5166d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to suspicious domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/strik?utm_term=brown+sugar+blues+song PDF link annotation
    • http://rezonansmusic.com/samsung_voice_assistant_turn_off_a10ees7yf.pdfIn PDF document text
    • https://tugadebijo.weebly.com/uploads/1/3/4/0/134042488/2555566.pdfIn PDF document text
    • http://kmikaerfs.ru/physical_therapy_low_back_pain_evaluation_templatek7pr7.pdfIn PDF document text
    • http://meetsucre.pro/where_do_i_oil_my_necchi_sewing_machineci83a.pdfIn PDF document text
    • http://tehnotop.site/41162493031e3g6l.pdfIn PDF document text
    • http://gravkamen.ru/what_is_the_natural_rate_of_unemployment_formula7k6lp.pdfIn PDF document text
    • http://edevletorg.com/997351031298ay56.pdfIn PDF document text
    • http://volosaty100.xyz/apush_chapter_3_analysis_questionsmz8va.pdfIn PDF document text
    • http://flowerport.market/the_art_of_her_deal_authorkkjea.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/tevomenil/nuteg.pdfIn PDF document text
    • https://s3.amazonaws.com/boxujetanonikuv/275395262.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/spider-_man_3_game_ppsspp.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/87980148951.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/phone_calls_through_wifi_android.pdfIn PDF document text
    • http://zubiluwetij.myartsonline.com/mirelumibudezexamuvo.pdfIn PDF document text
    • http://nabulegewuwal.myartsonline.com/skipping_rope_training_program.pdfIn PDF document text
    • https://s3.amazonaws.com/numunenoji/how_to_2x2_picture_in_paint.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_off0000ef5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5E 5132 bytes
SHA-256: 64547d627a6e40aae8b86ec26969dd44a23f8890a24d41ac8acebb4904c68992
font_01_sfnt_off000100f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F9 10516 bytes
SHA-256: f42be58169b9ec1131babf0a583d8c44179c8bee1c4c331d25fb365960537bde

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