Malicious PDF — malware analysis report

Static analysis result for SHA-256 118bb4df4a38ffdc…

MALICIOUS

PDF

82.4 KB Created: 2021-03-19 17:04:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da1df64e2eb16b96af5dd11162cd8877 SHA-1: eb04e70b4f4d71e13983049ea7b5ed61b56f47e4 SHA-256: 118bb4df4a38ffdc4f11fa96b25582f45aa261f76cca2e7200ba8436a3969310
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for phishing or redirecting users to malicious sites. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of links, suggesting an attempt to manipulate search engine results or distribute malware. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://soxebez.ru/award?keyword=c%25C3%25A1ch+chuy%25E1%25BB%2583n+t%25E1%25BB%25AB+file+pdf+sang+h%25C3%25ACnh+%25E1%25BA%25A3nh
    • http://amsidisi.xyz/who_killed_king_herod_in_the_bible98hxm.pdf
    • http://kogegoleteneka.iblogger.org/bulexoliterumasumuli.pdf
    • http://rometolipopi.iblogger.org/osha_safety_training_program.pdf
    • http://custits.space/information_systems_interview_questions_and_answersd1y72.pdf
    • http://garobunatuxovi.scienceontheweb.net/conscious_discipline_breathing_posters.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6d21d3bc-3f4c-43e9-ab63-9b62a6b64b5b/hp_laserjet_pro_400_color_printer_m451nw_firmware_update.pdf
    • https://1a441fb4-51dd-4528-a053-eb59ff664e18.filesusr.com/ugd/43d9d5_07d56c78b58a48a7ae5e8d08f38d4fb0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a16f110f-b7d2-4aec-930e-3376756e802c/arduino_uno_board_info.pdf
    • https://101c3d73-5e22-4da1-a203-a3a2a794ce88.filesusr.com/ugd/69a512_313c2a33b94145e89295bcc51d7860f7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2d4a4b91-e307-40e0-b7fa-f1d36c167f0b/zimafusoxewagenugefowite.pdf
    • https://uploads.strikinglycdn.com/files/8533a3a8-e96b-472a-8b71-d39d7af00eb7/kuminulusujof.pdf
    • http://kokalukavevip.epizy.com/naqaab_bengali_movie_mp4_video_song.pdf
    • http://tekunobujolid.epizy.com/57540640624.pdf
    • https://d115d978-d96a-40c8-9764-5d959708fc35.filesusr.com/ugd/436160_32802a9ba36a48898ee99bd9e7a599d3.pdf?index=true
    • http://maretubozewugi.myartsonline.com/0_1st_and_2nd_conditional_exercises.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_off0000f45c.bin
5f208e33210e3130d158b5cd45b1ea93c744faed729618b80ac1b7373a4b781b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF45C 6248 bytes
font_01_sfnt_off00010835.bin
8a2b40e193d0d5db3d39b71f6b9cd2a3444fe7627512a37124d3508cda8967ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10835 22952 bytes

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