Malicious PDF — malware analysis report

Static analysis result for SHA-256 01ef3764d6211bed…

MALICIOUS

PDF

82.7 KB Created: 2021-03-21 06:08:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 150586d737978c03615890d584b0f0ed SHA-1: ce99722c6d4724b9fe75baaac5313184b7c7fe70 SHA-256: 01ef3764d6211bedb969286c80372b2cced974c7ee9d5fc5945e238ec76dc059
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are flagged as link farms. The primary URL, 'https://soxebez.ru/strik?utm_term=types+of+curriculum+vitae+template+for+students', suggests a phishing or scam attempt disguised as a resource for students. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://soxebez.ru/strik?utm_term=types+of+curriculum+vitae+template+for+students PDF link annotation
    • http://soinjaga.ru/8132195258090oxb.pdfIn PDF document text
    • http://cabinetsly.xyz/actividades_de_lectura_y_escritura_para_primer_grado_de_primariawoq07.pdfIn PDF document text
    • http://affilateapp.online/tixupoparuwixexobchl10.pdfIn PDF document text
    • https://xetiwokew.weebly.com/uploads/1/3/4/7/134741649/zokoz.pdfIn PDF document text
    • http://witefuxav.22web.org/fibutupinowi.pdfIn PDF document text
    • http://yachtcharter.group/4004184540ulcl9.pdfIn PDF document text
    • http://tovelksa.website/physical_and_chemical_changes_quiz0u4fh.pdfIn PDF document text
    • http://padojuputiki.iblogger.org/rockwell_hardness_test_lab_report.pdfIn PDF document text
    • http://kumorafeg.iblogger.org/citizen_eco_drive_skyhawk_black_eagle.pdfIn PDF document text
    • https://gutavavoz.weebly.com/uploads/1/3/4/0/134000423/febutafibem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xazawipobu.rf.gd/fervent_book_in_spanish.pdfIn PDF document text
    • http://popudedakajani.rf.gd/engranajes_de_tornillo_sin_fin.pdfIn PDF document text
    • http://kibozitasosisan.epizy.com/84939272184.pdfIn PDF document text
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_0502683c3115471f9f08de9f479e864f.pdf?index=trueIn PDF document text
    • http://dedetepejoxele.epizy.com/ussr_anthem_mp4.pdfIn PDF document text
    • http://gepikadagutuv.epizy.com/mozilla_reference_browser_apk.pdfIn PDF document text
    • http://leliruwe.epizy.com/today_s_weather_report_in_my_location.pdfIn PDF document text
    • https://88211235-bf86-4d40-a6ec-a052db2f682e.filesusr.com/ugd/94e5ef_63323f3a236f4f278d65f7df9be3292d.pdf?index=trueIn PDF document text
    • http://zozoramotuwiv.rf.gd/50765474343.pdfIn PDF document text
    • http://mewarur.rf.gd/the_thrill_of_the_chase_poem_location.pdfIn PDF document text
    • http://fekimemisuj.rf.gd/rafekojufiwe.pdfIn PDF document text
    • http://vedaremix.epizy.com/hotel_mandarine_regency_tbk_annual_report.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_off000104e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E0 5412 bytes
SHA-256: 6ca3a07bb9b193ffd638fd4214da1fbe864f6204dff2293d4ae3221c61e40ed8
font_01_sfnt_off00011745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11745 10988 bytes
SHA-256: a8256d60a5b1577f18868047e4e994f8d19b1de47db1d68e52e6a5906d75e792

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