Malicious PDF — malware analysis report

Static analysis result for SHA-256 394a719985ace774…

MALICIOUS

PDF

72.3 KB Created: 2021-02-25 01:12:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f0881885116fa1b4715d7b44d9f9d5c9 SHA-1: 22609023be239eeb12649c94b4d6f2cfc0396382 SHA-256: 394a719985ace7743fc0129e840552a4aea684242619a4b43e1fab6a2470f03f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains an external URI pointing to 'seumenha.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to educational materials for primary school children.

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://seumenha.ru/123?utm_term=cuaderno+de+actividades+de+lectoescritura+para+primer+grado+de+primaria+pdf PDF link annotation
    • https://cdn.sqhk.co/zejizoguzut/p8bjaqI/jikoroguruvinirobew.pdfIn PDF document text
    • https://cdn.sqhk.co/fodexuxefeba/7BRjgut/what_do_military_drones_look_like_at_night.pdfIn PDF document text
    • https://cdn.sqhk.co/bujerinalo/cSie3he/technical_project_manager_salary_nyc.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/wiwamoxamo/extent_report_jars_version_2._41._2.pdfIn PDF document text
    • http://xazogugikuriwox.rf.gd/89352905158.pdfIn PDF document text
    • https://s3.amazonaws.com/vibasujefir/afterglow_bluetooth_headset_ps4_setup.pdfIn PDF document text
    • http://rimuvuvipimube.epizy.com/salon_fundamentals_cosmetology_study_guide_answers.pdfIn PDF document text
    • http://verirajoxa.epizy.com/64438206099.pdfIn PDF document text
    • http://sogivuwe.onlinewebshop.net/3683410849.pdfIn PDF document text
    • https://s3.amazonaws.com/wapabefizosumi/54577632235.pdfIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/arya_audio_songs_come_ing.pdfIn PDF document text
    • http://lobopekogolo.onlinewebshop.net/world_of_darkness_slasher.pdfIn PDF document text
    • https://s3.amazonaws.com/fedure/97464188584.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/individual_health_care_plan_template_for_schools.pdfIn PDF document text
    • http://sidepojedava.myartsonline.com/marine_corps_physical_fitness_program_mco.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_off0000db0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0F 5440 bytes
SHA-256: 4c924cb036d69930c3559da71a74d1ccd48e4bcf795132553cd933db4fc6233e
font_01_sfnt_off0000ed82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED82 11796 bytes
SHA-256: 75474e8e1743ea896872fd1d35efa5b397e499066f6b7e479d0a86d0bf519bb7