Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf17bbdfd4427e19…

MALICIOUS

PDF

84.8 KB Created: 2021-03-27 22:22:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 0c207013221fb6ce1ba995a5d8d96a9f SHA-1: d53a40622c96a3c9f6d0777a546e2c8356bfc785 SHA-256: bf17bbdfd4427e196ef6d9053c376c4473fda0bde7a340299c31043b0733ca1a
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 'vilenefex.ru', which is likely the primary lure. The document body, though heavily obfuscated, contains keywords related to the URL, suggesting a social engineering pretext. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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/award?keyword=socialismo+cubano+pdf PDF link annotation
    • https://talipugetajizan.weebly.com/uploads/1/3/4/8/134862074/vexawufoxoritotiv.pdfIn PDF document text
    • http://mirumumavetifun.mypressonline.com/alister_mcgrath_libros.pdfIn PDF document text
    • https://jikodidujur.weebly.com/uploads/1/3/5/3/135319234/5462332.pdfIn PDF document text
    • http://zilofunawoson.iblogger.org/is_there_a_grace_period_for_license_renewal.pdfIn PDF document text
    • https://gawofatofuwe.weebly.com/uploads/1/3/1/3/131380275/375417.pdfIn PDF document text
    • http://sewawena.scienceontheweb.net/tavatapijiwuvupuxawivigus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c8a2383-3159-4bab-8da4-88b314eb4895/albert_pike_tire__services_hot_springs_national_park_ar.pdfIn PDF document text
    • https://s3.amazonaws.com/lomiwexuva/pujosafen.pdfIn PDF document text
    • http://taxejama.rf.gd/butterbeer_harry_potter_recipes.pdfIn PDF document text
    • https://s3.amazonaws.com/xaliwalufoguni/guava_lotus_organic_crib_sheet.pdfIn PDF document text
    • http://sevetise.rf.gd/wiwutavumumuwosatawiwosij.pdfIn PDF document text
    • http://tobikinos.onlinewebshop.net/legetesox.pdfIn PDF document text
    • https://s3.amazonaws.com/wovitiku/cello_songs_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/oracle_sql_developer_query_result_date_format.pdfIn PDF document text
    • https://s3.amazonaws.com/gajakelegeza/tippmann_98_custom_mod_kits.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e85c6fc0-97f8-4519-acb6-6f74b6bf5687/que_es_titulo_azul_en_carros.pdfIn PDF document text
    • http://lilobemo.epizy.com/baby_trend_sit_n_stand_double_stroller_replacement_parts.pdfIn PDF document text
    • http://vimejiritafed.rf.gd/rent_old_school_cars_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49bfafb4-f4f9-4926-94b5-cb3d79520960/stan_getz__joo_gilberto_the_girl_from_ipanema_letra_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5217ca2-e9b1-429f-a927-2a552618e2ff/how_to_pass_dental_assistant_school.pdfIn PDF document text
    • http://zizumanoxiv.epizy.com/kakizufubabezuzuvo.pdfIn PDF document text
    • http://zuwipipulu.epizy.com/neditana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cd47c66-dffc-40a6-8c6e-8daa34ba56f7/craftsman_1_hp_3_gallon_air_compressor_troubleshooting.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_off00010be9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE9 5448 bytes
SHA-256: 80708900d1435bda07eadbbb3ae820d426ab104a666e3c6cd8f225a6ffea4b9f
font_01_sfnt_off00011e61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E61 12140 bytes
SHA-256: 1f84f45bf74149695eee5747a3e6d50b6ab4beb3693e9b9bec0b445567734a09

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