Malicious PDF — malware analysis report

Static analysis result for SHA-256 5570b9bef8267feb…

MALICIOUS

PDF

73.3 KB Created: 2021-03-17 10:21:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 66a35d5d4705cfd270ea098c5f7b59d3 SHA-1: 443d435923d3f944961cf99c328f2043f9db79fc SHA-256: 5570b9bef8267feb8c97305ce38a2aa55b30cde810553e9f64575d0e6d5ed893
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'https://pelibifir.ru/wix?keyword=simplifying+polynomials+worksheet+hard', which is likely the primary malicious link. The document body, though heavily obfuscated, suggests a lure related to educational content to encourage user interaction with the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/wix?keyword=simplifying+polynomials+worksheet+hard
    • http://heliusdesign.ru/houghton_lake_mi_snowmobile_trail_reportmyq6r.pdf
    • http://pekibimige.mygamesonline.org/javoxalopo.pdf
    • https://talaxosukizarom.weebly.com/uploads/1/3/0/7/130775084/welakipolovupur.pdf
    • http://luneket.iblogger.org/58978692896.pdf
    • https://bowixasexagat.weebly.com/uploads/1/3/4/0/134041419/928186.pdf
    • https://derigibi.weebly.com/uploads/1/3/4/4/134447264/726298.pdf
    • http://just-gopro.com/summary_of_the_rainbow_fishnxzp8.pdf
    • https://manatelagaren.weebly.com/uploads/1/3/1/4/131437493/57861.pdf
    • http://zabolojisag.getenjoyment.net/how_to_put_together_total_gym_1400.pdf
    • https://xedasijaw.weebly.com/uploads/1/3/1/4/131453620/rurarufaji-mosaluloj-lekovadelijen-mikotumalako.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tekarileted.epizy.com/65865251855.pdf
    • https://s3.amazonaws.com/kibavutibeved/74436239326.pdf
    • https://s3.amazonaws.com/vapite/the_things_they_carried_gradesaver.pdf
    • http://weparaxopulo.atwebpages.com/quimica_organica_nomenclatura_ejercicios.pdf
    • https://s3.amazonaws.com/ruzaganog/ginajeremerisovupibariduk.pdf
    • http://numivonef.rf.gd/watermelon_man_herbie_hancock_sheet_music.pdf
    • https://s3.amazonaws.com/migivewuwe/dodubofexemerenovuluk.pdf
    • https://s3.amazonaws.com/tetenifeme/how_do_i_fix_my_router_not_connecting_to_the_internet.pdf
    • https://s3.amazonaws.com/megodipewukitoj/bmr_group_plc_annual_report.pdf
    • https://s3.amazonaws.com/vososasoxumete/54950413242.pdf
    • http://lijoxagejage.epizy.com/linux_mint_guide_for_beginners.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_off0000e137.bin
67d7cb00ef7d8f7aaf692ed32023f9d754b8b8dca3d71258b02cc19171536568
pdf-font-stream PDF embedded font (sfnt) at offset 0xE137 5816 bytes
font_01_sfnt_off0000f4f6.bin
4699c75be6cf748d31dcfc6f84e5ba7247bd695cca579e0f4de40c0683f83efe
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F6 10156 bytes