Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3a55df2b287d425…

MALICIOUS

PDF

76.5 KB Created: 2021-03-10 16:41:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 4d60be0f3c38621cc9f5791389cc99c6 SHA-1: 556735d10dc5483d8aa7a290b2dc69e87c620e72 SHA-256: e3a55df2b287d4252e9613332c79c585e3b134f6017e4165cfbd76221f5f2858
156 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many of which are likely malicious, as indicated by the 'PDF_SEO_LINK_FARM' heuristic and ClamAV detection. The document's content, though heavily obfuscated, suggests a lure related to a 'cold work permit form'. The presence of numerous unknown reputation URLs points towards a phishing or malware distribution attempt.

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://baarspo.ru/123?utm_term=cold+work+permit+form+pdf PDF link annotation
    • http://jusojixanona.getenjoyment.net/exception_handling_python.pdfIn PDF document text
    • http://sepibigejakina.22web.org/shiva_cartoon_video_picture.pdfIn PDF document text
    • http://detonic-deutschland.website/competencia_comunicativa_uanl0lfcq.pdfIn PDF document text
    • http://pinopizo.sportsontheweb.net/how_to_connect_soundlogic_headphones.pdfIn PDF document text
    • http://bristol-yalta.run/wudukifokremh4.pdfIn PDF document text
    • http://hdvideo.design/zombie_tsunami_promo_code_2020mu90m.pdfIn PDF document text
    • http://poxumanavofeboz.scienceontheweb.net/advanced_mathematical_concepts_precalculus.pdfIn PDF document text
    • http://pefiworawodud.mypressonline.com/singing_for_dummies_cd_mp3.pdfIn PDF document text
    • http://sawemawe.mywebcommunity.org/82394348864.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8f20b4bd-83f7-4a55-8c6f-e9501e2e061c.filesusr.com/ugd/c1c462_36b38a29b56c45b1a2313af3a21913d3.pdf?index=trueIn PDF document text
    • https://17851959-1482-4b49-8222-7b7b0c628459.filesusr.com/ugd/3cb679_e83fed2cca0a483d84d5fced748dd46f.pdf?index=trueIn PDF document text
    • https://297de083-771a-4730-a3b8-a2afe8c7d209.filesusr.com/ugd/47424f_d87225396d904721a02dfa67cc1dbd33.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/tegovapexerenolom.pdfIn PDF document text
    • https://4779f2f8-a33e-4327-9c78-21ee0bcf4620.filesusr.com/ugd/31bf02_ee23be77ffc743828f734d7ecd345078.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jotogorurekuro/japanese_gastric_cancer_treatment_guidelines_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/recommendation_letter_formatting.pdfIn PDF document text
    • https://s3.amazonaws.com/megujobemegor/josemizotizuxobobizivago.pdfIn PDF document text
    • https://s3.amazonaws.com/tufitijinexu/bufadadiwepez.pdfIn PDF document text
    • http://wefexafunedex.epizy.com/html_template_in_javascript_file.pdfIn PDF document text
    • http://jimomurapujivo.onlinewebshop.net/pejutuwakusenere.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_off0000f03e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03E 4860 bytes
SHA-256: b73498dafba05838ace4e87f27d3678baa2cfed296bef308e9e10159edeaa2f2
font_01_sfnt_off000100c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C0 10432 bytes
SHA-256: 795dad0c5e715651f4fe6e5294cc3051bcc65c0bebfd97a7f81f943fc0fb3d73

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