Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ceb442de7ad0db6…

MALICIOUS

PDF

71.2 KB Created: 2021-03-20 10:51:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a9a91959155b86fbdbc671e1a22b0e9 SHA-1: 2e85f78acb3e160479b0b2467f76e6af35633cda SHA-256: 8ceb442de7ad0db615c1b4ee3a863f66827370a8b450feb1f22a2d42c2fe862d
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a high risk score. It contains an embedded URI pointing to a suspicious domain, which is likely used to host a malicious payload or redirect to a phishing site. The document body, though heavily obfuscated, suggests a lure related to educational worksheets, which is a common tactic for phishing or malware distribution.

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://mezovuduw.ru/wix?keyword=linear+inequalities+word+problems+worksheet+with+answers
    • http://streichpack.online/sazegerakuwudategapixa6hc01.pdf
    • http://xofebuledat.scienceontheweb.net/can_settlor_remove_a_trustee.pdf
    • http://gopusoduj.mygamesonline.org/24201056500.pdf
    • http://normab-id.com/692348162243bhug.pdf
    • https://rovibabewovel.weebly.com/uploads/1/3/4/8/134884015/jonubafopupapilub.pdf
    • http://insurancesouk.com/cold_equations_summarynd1jj.pdf
    • http://konolux.medianewsonline.com/lodge_cast_iron_recipes_pork_chops.pdf
    • http://krokoboko3.xyz/sepatobiratidokerapsvu6v.pdf
    • http://re-prime.ru/what_is_the_best_tip_to_use_for_frosting_cupcakesecp8g.pdf
    • http://salonhq.xyz/the_lying_game_cast_where_are_they_now2g1ux.pdf
    • http://trylait.pro/73627972982b6meq.pdf
    • http://xikofav.iblogger.org/78631552752.pdf
    • http://ryukzak.digital/usa_18_wheeler_truck_drivertxdht.pdf
    • http://good-production9.site/parking_fine_appeal_letter_template_ukk9057.pdf
    • http://sewonmedix.ru/how_can_you_prove_that_sunlight_is_necessary_for_photosynthesis_lab_activityq8n6n.pdf
    • https://wexasubofuxumeb.weebly.com/uploads/1/3/2/7/132740188/vemigomusesusoziw.pdf
    • http://lumogodasekepi.mypressonline.com/job_interview_questions_and_answers_2020.pdf
    • http://inmyshtangen.xyz/690181225631w4gu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://losalevova.epizy.com/fomujoputafinavufimobegu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7d7.bin
28554bd53c8e844258afa7bd611befbdcedcb5626f5571b445389d605b8ea444
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D7 5564 bytes
font_01_sfnt_off0000eaa5.bin
1891a7b380d64fe965e36949079b0e5330250f7ee5c6bbaf5159e02e319ab589
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA5 10656 bytes