Malicious PDF — malware analysis report

Static analysis result for SHA-256 52f98890cfa9060c…

MALICIOUS

PDF

86.1 KB Created: 2021-05-25 06:33:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 9d2a2ab76ed6716806535d6ebe6da1dc SHA-1: 338dc8561972a56a7892beea675e1e2e270fd964 SHA-256: 52f98890cfa9060cefc88cc6added661e319cc45e970d0b3fda1804bb4aa96f8
96 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for an embedded URI pointing to a suspicious domain, which is also listed as a URL. The ML classifier and ClamAV detection strongly indicate maliciousness. The document body, though heavily obfuscated, appears to be related to a smart TV box firmware update, suggesting a phishing or social engineering lure to direct the user to the malicious URL.

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://resalured.ru/strik?utm_term=mxq+4k+rk3229+smart+tv+box+firmware+update PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4378378/normal_5feb9a87893dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413121/normal_606316ef9c2be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413225/normal_60392a3a505df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419211/normal_5fda9546a70c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408976/normal_5fe869acba071.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369919/normal_5ff9faaa3bfa7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465924/normal_6059b91893a42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527859/normal_604dc5f06f19b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387709/normal_5fcb59d536a9a.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/divikufifir/takujexamefos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5e558e5-27de-48c5-bd7b-b2bae67610e9/2012_ford_f350_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3669dcdc-e891-4df1-b920-56038568c1d9/28003432516.pdfIn PDF document text
    • https://s3.amazonaws.com/wozowuledij/how_to_clean_a_keurig_k10_coffee_maker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/114220ba-7b57-4d11-8346-61a3e050f351/what_is_the_salary_of_3rd_grade_teacher_in_rajasthan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9bb8a66-7cfb-43a4-a0a5-96bc59c47465/47969703469.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c240cb3e-1eb2-452e-842f-1105f4c1aee8/exercises_in_style_raymond_queneau.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7d1f7d2-cb1a-4d39-bad6-a26402ea9605/how_to_fix_xbox_360_controller_button_stuck.pdfIn PDF document text
    • https://s3.amazonaws.com/saxefi/kudatobaxi.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/game_for_windows_live.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/hiren_boot_cd_user_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zibenoroduzuw/swan_lake_piano_sheet_music_musescore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44102510-552d-4e0e-9c1d-b529566f6aea/12988470510.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53288b40-5c62-41b0-b63f-e177e4a2ae7c/how_to_remove_ink_cartridge_from_canon_ts3122.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ede9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE9 6248 bytes
SHA-256: 7b56992520809cbda5472e097e562393a3f344fc74274e6bd2a284d407baa201
font_01_sfnt_off00010335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10335 21032 bytes
SHA-256: 32b175a249484fc9ae8c165cf1058db8d28e26a91cd24b16c2bd2a1f6f77c44f
font_02_sfnt_off00013322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13322 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15

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