Malicious PDF — malware analysis report

Static analysis result for SHA-256 29115cd09624a389…

MALICIOUS

PDF

77.7 KB Created: 2021-03-23 16:11:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 833396b6021ac37d1e8cb58c0a9fb992 SHA-1: 4a11111c64fb4bacd210ed08cada0dad8e0a233b SHA-256: 29115cd09624a389c6d5d9b495b035fca5726d74954708d154d4e1aad41ac57f
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'druttle.ru', which is likely the phishing landing page. The document body is heavily obfuscated, but the presence of the malicious URL and the high confidence verdicts strongly suggest a phishing attack.

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://druttle.ru/award?keyword=cosmic+energy+pdf
    • https://cdn-cms.f-static.net/uploads/4425915/normal_602541cacff65.pdf
    • http://vexasefagi.scienceontheweb.net/la_peste_albert_camus_descargar.pdf
    • https://cdn.sqhk.co/tamupoto/jQfnq55/tiktok_video_and_music_downloader_without_watermark.pdf
    • https://cdn.sqhk.co/visesefider/ia11ojb/smash_bros_ultimate_dlc_characters_list.pdf
    • http://lazirog.mywebcommunity.org/list_of_carnatic_ragas.pdf
    • https://cdn-cms.f-static.net/uploads/4421199/normal_6016ff6c111e5.pdf
    • https://cdn-cms.f-static.net/uploads/4403680/normal_600a496eb6438.pdf
    • https://cdn-cms.f-static.net/uploads/4411696/normal_603aaafd23796.pdf
    • http://dudoxanudito.scienceontheweb.net/59090877845.pdf
    • http://jidapuxedepu.medianewsonline.com/metal_cutting_machine_tools_textbook.pdf
    • https://cdn.sqhk.co/neseleko/PRkbwje/cossacks_ww2_british.pdf
    • https://cdn.sqhk.co/juzurupivepo/d0S1kjg/egg_inc._all_eggs.pdf
    • https://cdn.sqhk.co/votojuxosaf/gdMe9hh/70238919202.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kujesulad/what_is_probability_in_machine_learning.pdf
    • https://uploads.strikinglycdn.com/files/8f9ab53c-df26-4564-ad29-6ba6f53a765b/are_there_going_to_be_more_six_of_crows_books.pdf
    • https://uploads.strikinglycdn.com/files/a65971bd-b193-4f95-99ed-2c116398a0b1/vezetarabatub.pdf
    • https://s3.amazonaws.com/xuzakob/insinkerator_badger_5_broken_reset_button.pdf
    • https://uploads.strikinglycdn.com/files/fccf771f-1bf2-4bcd-a796-67ad00198b75/93768884236.pdf
    • https://s3.amazonaws.com/towutoginadivu/microsoft_windows_games_emulator_for_android.pdf
    • https://uploads.strikinglycdn.com/files/5288d1a7-d3dd-4df8-a4cc-851d168e63b1/kexapatapuzexafejapibap.pdf
    • https://s3.amazonaws.com/sigobija/chrome_update_2019.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_off0000f233.bin
4bbccfe6504591450a1e40483aabcb8086c35a40fe224e3b346cb9d024fa67f7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF233 5240 bytes
font_01_sfnt_off000103fc.bin
e368d32896f7e5e386b403bfde01b98aabc70a2a074966d4218021530ff2ff59
pdf-font-stream PDF embedded font (sfnt) at offset 0x103FC 11104 bytes