Malicious PDF — malware analysis report

Static analysis result for SHA-256 81e2714fba440b73…

MALICIOUS

PDF

76.1 KB Created: 2021-03-17 17:01:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3e213ba5a48415edc3616d3284b060dc SHA-1: 276e818a419a8f549ef1acfefeeaea73ab08b1cb SHA-256: 81e2714fba440b731f672a019dd24acbe8dc7df88e39c3476aa6cdc0a04d13ec
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URI pointing to a suspicious domain, identified by ClamAV as a phishing trojan. The ML classifier also flagged the PDF as malicious. The document body, though heavily obfuscated, contains references to wkhtmltopdf and a date, suggesting it might be a generated document. The primary IOC is the external URI which likely leads to a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/strik?utm_term=how+to+use+fender+champion+20+amp PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4481665/normal_5ff170176ecf7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403687/normal_600ef015d2312.pdfIn PDF document text
    • https://xigarivopupu.weebly.com/uploads/1/3/5/3/135300822/81a760f5bb45b.pdfIn PDF document text
    • http://bawuwevub.22web.org/form_i_134_affidavit_of_support_2020.pdfIn PDF document text
    • https://totaduwuvib.weebly.com/uploads/1/3/0/9/130969262/169cc9216251c.pdfIn PDF document text
    • http://nomevufaneboja.mypressonline.com/85424663004.pdfIn PDF document text
    • http://vizojuzoninunoz.scienceontheweb.net/affairscloud_pocket_june_2020.pdfIn PDF document text
    • https://turetufifej.weebly.com/uploads/1/3/4/5/134500159/4610953.pdfIn PDF document text
    • https://nipoxumafoji.weebly.com/uploads/1/3/4/7/134717148/mebefulado.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xebowuruno.epizy.com/school_schedule_template_google_docs.pdfIn PDF document text
    • https://s3.amazonaws.com/xoferuzu/27979931058.pdfIn PDF document text
    • http://bufijonewufo.onlinewebshop.net/kaliwojijejut.pdfIn PDF document text
    • http://vetovolixexa.epizy.com/abituriyent_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/lofese/ayo_and_teo_videos_mp4_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/arduino_stepper_motor_driver_code.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/customs_declaration_form_usps_military.pdfIn PDF document text
    • http://bojonovaja.rf.gd/reporter_vacancy_in_amharic.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/jazzy_power_chair_parts_manual.pdfIn PDF document text
    • http://fonujepurixadal.epizy.com/vodiludirukasu.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_off0000eaf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF6 5692 bytes
SHA-256: d4c4c482ed04035ee101d7abe692a2b947383d655c740b39a472f1cdf8bc4a58
font_01_sfnt_off0000fe3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3F 10972 bytes
SHA-256: a19fae64817be6bc0cc012ae5159b433ed008ae8caf3aaf07ac50b23f601920d

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