Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4357fc010f472ad…

MALICIOUS

PDF

79.2 KB Created: 2021-06-10 22:51:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0bbe12be830b7b8384e552853dc5395 SHA-1: 7277c3afa15161c9b68dd24f0b8d83ccd92ad12b SHA-256: b4357fc010f472adbac23596bf4410b630d1bf496213ce0a5d749412bb1f8083
96 Risk Score

Malware Insights

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

The PDF file contains a heuristic indicating an external URI, which points to a suspicious domain. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the presence of an embedded URL in a PDF, coupled with high-risk heuristic detections, indicates an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://krisoc.ru/pbw?utm_term=unishop+universal+e+commerce+template+free
    • https://static.s123-cdn-static.com/uploads/4451047/normal_5ff6748417eed.pdf
    • https://cdn-cms.f-static.net/uploads/4453333/normal_6010cb3c3a2a2.pdf
    • https://cdn-cms.f-static.net/uploads/4459784/normal_601d21977f862.pdf
    • https://cdn-cms.f-static.net/uploads/4481053/normal_6062cf39a655b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://detomipipu.pbworks.com/f/wanawun.pdf
    • https://uploads.strikinglycdn.com/files/39cc5899-a60a-45ea-8552-aaa358667145/bugubokagasurovu.pdf
    • http://fezosubi.pbworks.com/w/file/fetch/144780585/hillsborough_county_schools_report_cards_quarter_4.pdf
    • http://serukula.pbworks.com/w/file/fetch/145069224/6_ps_of_retail_marketing.pdf
    • https://uploads.strikinglycdn.com/files/b83513c0-1396-4119-89ff-9b3c24cf90b1/mrs_basil_e_frankweiler_questions.pdf
    • https://uploads.strikinglycdn.com/files/440367fc-d11e-47b9-bfc4-830814b0aac2/29175193419.pdf
    • http://filijego.pbworks.com/f/senosubugufamazejisirede.pdf
    • https://uploads.strikinglycdn.com/files/213efac5-3721-4e99-afbd-79a8b4bba8a2/can_you_play_games_on_the_ti_84_plus_ce.pdf
    • https://uploads.strikinglycdn.com/files/5b37fd2e-3b14-4abc-92ee-725a5b662457/to_kill_a_mockingbird_chapter_20_23_questions_and_answers.pdf
    • http://tiduxikuve.pbworks.com/f/oromo_amharic_dictionary.pdf
    • http://xizidiw.pbworks.com/w/file/fetch/145054728/find_the_equation_of_a_line_in_slope_intercept_form_calculator.pdf
    • https://uploads.strikinglycdn.com/files/6b485ce6-2e05-4bd9-a00a-8f3e879e656b/22078429776.pdf
    • https://uploads.strikinglycdn.com/files/fc8df5b0-0c73-485c-9449-57033f47a789/cuisinart_coffee_grinder_setting_for_drip.pdf
    • https://uploads.strikinglycdn.com/files/defa918a-95d8-4cea-a789-cb7b51cb7f94/43955993833.pdf
    • http://vajaxasave.pbworks.com/w/file/fetch/144455469/how_much_do_daycares_pay_their_employees.pdf
    • http://fijinatuzut.pbworks.com/w/file/fetch/145071330/70064907511.pdf
    • https://uploads.strikinglycdn.com/files/e05185db-072e-4413-979a-ebe8b09c6a7b/are_directv_receivers_4k.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f745.bin
974e148c2eb595a266860769880bb4a5cf09d78706a3509c068db552632f1013		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF745 5308 bytes
font_01_sfnt_off00010935.bin
043daabe7d448ab77a80ad29702905a006f2d080e6107793005d174d3c5b9f31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10935 11224 bytes

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