Malicious PDF — malware analysis report

Static analysis result for SHA-256 9747254482dcfd47…

MALICIOUS

PDF

81.5 KB Created: 2021-04-09 20:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cdedec638179a53b5d2e26aab3bf7ec3 SHA-1: 6710f561e3e9ea0db9dcc5033adad46a64ec62b9 SHA-256: 9747254482dcfd471fab5166ca44a409c82fa08ee2ef5c341e47671558bddb79
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, one of which is https://vilenefex.ru/strik, suggesting it is used to redirect the user to a malicious site. The document body, though heavily obfuscated, appears to be a lure related to 'Ap calculus ab multiple choice 2017 answers'. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/strik?utm_term=ap+calculus+ab+multiple+choice+2017+answers
    • http://muzowidepikoz.iblogger.org/18572317784.pdf
    • http://vixinusagodax.scienceontheweb.net/guwafomalarigore.pdf
    • http://inostrana.com/cowboy_goodbye_songqaym2.pdf
    • http://mutujejeturuduf.medianewsonline.com/20969383197.pdf
    • http://jesibijifinuz.mywebcommunity.org/typhoid_fever_in_pregnancy.pdf
    • http://lnstagramcopyrightcenter.com/594467215948nnnc.pdf
    • http://uaregroup.com/why_is_sky_remote_beepingi381p.pdf
    • http://tameeniraq.com/30944113569zjs9a.pdf
    • http://idealica-ordina.site/108_ambulance_siren_ringtoneb5w5w.pdf
    • http://s7hmus.org/jamalhvnzq.pdf
    • http://profapp.pro/luraxozakazoto2gena.pdf
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdf
    • http://originalhallyu.com/gavosesewafaretawes5vul.pdf
    • http://help-lnstagramcopyrights-verify.com/64706462239shiu5.pdf
    • http://povar2020.site/email_asking_for_information_about_admissionnakrs.pdf
    • http://rabejagoruwobol.66ghz.com/40892177144.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2cc12256-1025-444a-bacb-901a9f007bda.filesusr.com/ugd/d1fcfc_50c6e331e8fa47a7900913f48e06c5eb.pdf?index=true
    • http://sixuregorajaso.rf.gd/8224934178.pdf
    • http://limoxukuk.atwebpages.com/how_to_test_a_hydraulic_pressure_sensor.pdf
    • https://51bf459c-6b46-41b0-863f-532cf8a77e0d.filesusr.com/ugd/2eedf1_e00453c8772f49ecb49fb8336fc013e8.pdf?index=true
    • https://63995da9-74be-4895-8497-a4fa53c9845d.filesusr.com/ugd/788c84_ddf0f1272d94470cb044880172fada0d.pdf?index=true
    • 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_off0001008d.bin
97252770ce37b214e60e421e5f7188c8d76b1888cd7d8230f528e02ab8ebbcdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1008D 5800 bytes
font_01_sfnt_off00011438.bin
7a427d445709f473ea852b76693532f8728e269d913ce17496c5f47b3a9340ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11438 10656 bytes

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