Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ff324aba4b7e7a6…

MALICIOUS

PDF

78.0 KB Created: 2021-02-22 10:54:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 5ee85f48d2124c603f93af3b25a2d509 SHA-1: 205409183159ea8d6a96ef69eeb210d14fe6e01a SHA-256: 4ff324aba4b7e7a6e6b56947309fefaee74cc5fc1785167994a24ab010696bee
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that leads to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The ML classifier also flagged this PDF with high confidence. The document body, though partially corrupted, suggests a lure related to trigonometric exercises to entice users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/123?utm_term=ejercicios+con+razones+trigonometricas+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386363/normal_601f39c3a3548.pdfIn PDF document text
    • http://gutprod.xyz/where_can_you_buy_tracfone_sim_cardsejnvr.pdfIn PDF document text
    • http://tublitalia.fun/vegemetiguxenasolug5t53t.pdfIn PDF document text
    • http://hdvideo.design/araby_storyyrrmz.pdfIn PDF document text
    • http://bonifacy.site/4_pics_1_word_level_2009_answerbpmr1.pdfIn PDF document text
    • http://karaulovlife.site/zumetuse4zy7x.pdfIn PDF document text
    • http://reduslimitaly-official.site/roku_ultra_user_guidexpoqi.pdfIn PDF document text
    • http://hookup668.site/paulo_coelho_el_alquimista_gratisdxfd8.pdfIn PDF document text
    • http://copyrightsupporthelpcenter.com/racial_formation_in_the_united_states476di.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/fizaxo/kdoqi_guidelines_hypertension.pdfIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/assignation_temporaire_csst.pdfIn PDF document text
    • https://s3.amazonaws.com/mokamoba/genaturifetesivifu.pdfIn PDF document text
    • https://s3.amazonaws.com/fewifuwu/vepazig.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/free_dd_campaigns_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/curso_marketing_digital_e_ecommerce.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/jezedajakilexumukuxupaki.pdfIn PDF document text
    • https://s3.amazonaws.com/kopisigapub/firefox_driver_exe_for_selenium.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/alipay_logo.pdfIn PDF document text
    • https://s3.amazonaws.com/mamibis/john_deere_mower_seat_replacement.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_off0000ec6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6F 5524 bytes
SHA-256: 1c2e10e5f0349c269d3e784e188f2ca562293ccad8cec499e0b9a1dcd78a47e5
font_01_sfnt_off0000ff39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF39 12872 bytes
SHA-256: 4f65dcfea1b3c370f3fea3fbb2b92ddf281d0d401cde58d4120e397721ee525a

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