Malicious PDF — malware analysis report

Static analysis result for SHA-256 e069b8dbadca06ce…

MALICIOUS

PDF

74.0 KB Created: 2021-04-21 10:16:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0578345f60bcc51a47a7abd03c599cee SHA-1: efd73111e177d484f3f1a71ea52ac9b156a554d3 SHA-256: e069b8dbadca06ce776efec5bdc47866050150da0e54743743a9556f207a725d
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with one prominent URL (`https://soxebez.ru/strik?utm_term=kenmore+elite+oasis+washer+clean+cycle`) appearing to be a lure for a product search. The heuristic `PDF_SEO_DISPOSABLE_LINK_FARM` indicates a pattern of using disposable hosting for link farms, suggesting malicious intent. The ML classifier and ClamAV detection strongly indicate this PDF is malicious, likely serving as a phishing document or a dropper for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://soxebez.ru/strik?utm_term=kenmore+elite+oasis+washer+clean+cycle PDF link annotation
    • http://puvepum.getenjoyment.net/detibusisab.pdfIn PDF document text
    • http://tortomsk.ru/how_to_speak_korean_bookxyzkv.pdfIn PDF document text
    • http://klyshsheff.xyz/arjun_reddy_tamil_dubbed_movie_playtamilusr6n.pdfIn PDF document text
    • http://lisolu.org/98738311994qtteh.pdfIn PDF document text
    • http://nofubajabuv.medianewsonline.com/26465213881.pdfIn PDF document text
    • http://rajajime.mypressonline.com/careless_whisper_clarinet.pdfIn PDF document text
    • http://toppiksnack.xyz/game_of_thrones_head_of_the_dragon_imdb7w4r7.pdfIn PDF document text
    • http://dirozigumifew.scienceontheweb.net/csat_2020_answer_key.pdfIn PDF document text
    • http://nufurimuler.iblogger.org/can_you_negotiate_apartment_rent_nyc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kusazivaseduj.rf.gd/1698621252.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/541b61f9-9811-4ca9-bb08-5263964882bd/important_formulas_maths_class_10.pdfIn PDF document text
    • http://pimimozoji.myartsonline.com/lic_jeevan_anand_policy_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e47daf5-b21d-4b6d-8ff4-81bfd461958d/indian_stock_market_today_prediction.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3af82f46-3bde-453a-a95f-4f00a69f3afd/scientific_indications_in_the_holy_quran.pdfIn PDF document text
    • http://gijufebevavudep.rf.gd/general_knowledge_abbreviation_list.pdfIn PDF document text
    • http://nokarox.rf.gd/easy_to_learn_english_grammar_rules.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70b68e0e-660e-45b2-b844-ce168f765f31/they_say_i_say_4th_edition_online_book.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_off0000e15d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15D 5200 bytes
SHA-256: 7e900d4be2d1b0073c97b500271eb0633ae2645d13a306cc79aec23ac2a80b8d
font_01_sfnt_off0000f2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FA 11780 bytes
SHA-256: d66ce5265d91ba8e5917c3c51852cca97bcc5a9b2c8f4e6b9376eb6a83243ae9

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