Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7b8e66e884a82a7…

MALICIOUS

PDF

77.4 KB Created: 2021-03-19 19:33:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e348474fa4462513d09e169378cbde4 SHA-1: 727127d93e2d2308b928fcd56b74088199b05215 SHA-256: b7b8e66e884a82a7d9021ce0aa5409f1ef6440081a2fd72b46eb5b36fa2fb3d3
96 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'jumiwimov.ru', which is suspicious and likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to educational worksheets, aligning with common social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://jumiwimov.ru/wix?keyword=summarizing+worksheets+3rd+grade+pdf
    • http://kkkirrreeee.space/48971174929h41a.pdf
    • http://flowerport.market/mlb_schedule_2021_cardinalsfrg55.pdf
    • http://nomanodix.iblogger.org/categorizing_numbers_worksheet.pdf
    • http://gofimowekes.66ghz.com/7979557398.pdf
    • http://technodom11.com/84032036338993qo.pdf
    • http://guitar.su/totuzebofijovifawesejuguvgpzd4.pdf
    • http://damodudajipofem.22web.org/kisukusuzu.pdf
    • http://dsv-trening.ru/13414158173upiy6.pdf
    • http://gafaneripebenu.iblogger.org/descargar_programa_para_cambiar_de_a_word.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/remeranexe/periodic_table_worksheet_answers_chemistry.pdf
    • http://zaxutakizet.epizy.com/harvard_business_case_study.pdf
    • https://s3.amazonaws.com/zafijukopa/essentials_in_haematology_and_clinical_pathology.pdf
    • https://uploads.strikinglycdn.com/files/f0d9d508-a842-40aa-9ebf-8a823dfeff2b/birakefivoduj.pdf
    • https://s3.amazonaws.com/zidenigad/report_abandoned_vehicle_texas.pdf
    • https://s3.amazonaws.com/davawina/ccloud_tv_guide_addon.pdf
    • https://s3.amazonaws.com/gazitif/digestion_in_ruminant_animals.pdf
    • https://s3.amazonaws.com/farefasejikap/biket.pdf
    • https://uploads.strikinglycdn.com/files/c00fb50e-559d-4775-8132-f93a705ddffc/steve_harvey_books_online.pdf
    • https://uploads.strikinglycdn.com/files/c6477fca-3ce5-4f35-937a-a220e06eeaa8/tree_of_life_necklace_with_names.pdf
    • http://xekoduxunadisum.rf.gd/blocky_highway_hack_game.pdf
    • https://uploads.strikinglycdn.com/files/9e588750-f26a-420f-acfe-bfe489541a7b/star_trek_voyager_elite_force_ps2.pdf
    • https://s3.amazonaws.com/gopuze/kagowubewekisexajuw.pdf
    • http://pitefabe.epizy.com/divergent_full_movie_in_hindi_dubbed_free_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1c7.bin
c8bb5014c48666a8bc8a1c275c4a084b3fb91f7fda38b26b2e9bd490f364c42c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C7 5780 bytes
font_01_sfnt_off0000f553.bin
5097e446deb32085b181f085ade1a39f51183614dfa0fcf15996ecdf20d51e83		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF553 10632 bytes
font_02_sfnt_off000119a3.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119A3 4324 bytes

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