Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e8a19c15b3e10a7…

MALICIOUS

PDF

74.7 KB Created: 2021-03-04 08:41:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 1227284e106a93ee5466526a2067d305 SHA-1: ab07d90cc280f611f69884966844bf649ef215d6 SHA-256: 6e8a19c15b3e10a7daa6ddb7c32d7e72304063939ffca81cffb904896cc5c0e7
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain that appears to be part of a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to 'The dot book message'. No scripts were extracted, but the presence of many external URIs and the overall detection profile strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://leonvi.ru/strik?utm_term=the+dot+book+message PDF link annotation
    • http://lupepujalin.iblogger.org/nuzuwujuvepifevu.pdfIn PDF document text
    • http://nusukopov.22web.org/67676191142.pdfIn PDF document text
    • http://gunekagafa.22web.org/54921245060.pdfIn PDF document text
    • http://viwavidif.getenjoyment.net/desix.pdfIn PDF document text
    • http://xumupizaxuto.scienceontheweb.net/85800775429.pdfIn PDF document text
    • http://lebizifijafaxim.medianewsonline.com/why_wont_my_canon_printer_turn_on.pdfIn PDF document text
    • http://fosipuzo.mypressonline.com/gigulojuwere.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://govuwetubor.epizy.com/can_i_use_my_cell_phone_as_a_hearing_aid.pdfIn PDF document text
    • http://fosixijikalapi.epizy.com/what_does_the_red_button_in_my_mini_fridge_do.pdfIn PDF document text
    • http://tejutixofefadi.rf.gd/sony_bravia_android_tv_update_december_2018.pdfIn PDF document text
    • http://xuwizigev.rf.gd/padisuku.pdfIn PDF document text
    • http://matazovazer.epizy.com/77464824997.pdfIn PDF document text
    • http://gexazovaf.epizy.com/pressure_washer_pump_repair_shop_near_me.pdfIn PDF document text
    • http://darajakejaxise.rf.gd/canada_food_guide_servings_2018.pdfIn PDF document text
    • http://xujekodade.epizy.com/lg_front_load_washing_machine_leaking_water_from_bottom.pdfIn PDF document text
    • http://panadokopejed.epizy.com/chamara_weerasinghe_all_song_album_free.pdfIn PDF document text
    • http://mojogoralil.onlinewebshop.net/rca_w101sa23t1_wont_turn_on.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/elements_of_literature_fourth_course_answers.pdfIn PDF document text
    • http://kimawawasero.onlinewebshop.net/78738717092.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_off0000e7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D0 5264 bytes
SHA-256: b8c6dd44855f8b997f9d03fb6e21da12e659131d0d047e708575c946992ba758
font_01_sfnt_off0000f992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF992 10556 bytes
SHA-256: ceb411963b04ffa0bf5fb43429ae3beb3c6b90d2ac0b3bdd6079e041c3313560

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