Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7b88eec788aa739…

MALICIOUS

PDF

81.6 KB Created: 2021-03-24 04:53:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: f4d2caa8f8f50ae26504973df5a58b54 SHA-1: b8939b9ce56407d3968520cd511dfe75c29ba309 SHA-256: e7b88eec788aa73983c3aeea77ce0411e3b0995fcd27a79c51335166e8672c4b
126 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, with at least one pointing to a suspicious domain ('lozipotod.ru') that is likely used for phishing or malware distribution. The PDF structure also indicates it functions as a link farm, increasing the likelihood of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/wix?keyword=dna+model+worksheet+pdf PDF link annotation
    • http://madoxorijegobe.sportsontheweb.net/62959331615.pdfIn PDF document text
    • https://cdn.sqhk.co/dufubimaru/fjiSvWY/jenubizotabebutukuz.pdfIn PDF document text
    • https://cdn.sqhk.co/rogevuzazi/hi7gijh/84373909002.pdfIn PDF document text
    • http://sutarakikim.scienceontheweb.net/pizarov.pdfIn PDF document text
    • http://siwupojotuj.getenjoyment.net/principales_causas_de_la_caida_del_imperio_romano.pdfIn PDF document text
    • http://xuxodowenam.getenjoyment.net/mibatiletipaboku.pdfIn PDF document text
    • http://jidokove.scienceontheweb.net/minnesota_rules_of_evidence_impeachment.pdfIn PDF document text
    • http://moreprodukti.com/tiluvixilugerugiwuxudirmdmok.pdfIn PDF document text
    • http://vinnipoh.fun/honda_eu3000i_generator_spark_plugsjq2l.pdfIn PDF document text
    • https://cdn.sqhk.co/lojibuwe/4gi3wvM/color_flashlight_app_ios.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c3438639-6a75-4920-aa4f-d1e0b619354f.filesusr.com/ugd/3be3a7_671af772c5ca44d495c177904ca71c7a.pdf?index=trueIn PDF document text
    • https://de7eff9d-5c50-4122-bb99-ee112abf7a8f.filesusr.com/ugd/db8f21_e75fe67dc192457d8dc21b0bf2df1976.pdf?index=trueIn PDF document text
    • https://30f21d72-2b41-4965-a7bc-2abb02bf1ded.filesusr.com/ugd/47e66e_365460597ed54b10b8fbd7cb1ca621f9.pdf?index=trueIn PDF document text
    • http://gudukiderunusu.myartsonline.com/destination_b2_teacher_s_book_vk.pdfIn PDF document text
    • http://wurebosuloxu.myartsonline.com/new_ielts_listening_answer_sheet.pdfIn PDF document text
    • http://ziwivazud.onlinewebshop.net/how_much_do_entry_level_cpa_make.pdfIn PDF document text
    • https://4b4b92a8-4ac5-4030-97d5-af0917f8c077.filesusr.com/ugd/0251f0_394387613bb645408ae5cf200a6613f8.pdf?index=trueIn PDF document text
    • https://0c2a7d7b-be9d-4ef2-a94c-09ca905cc17d.filesusr.com/ugd/7d21c0_000b78efa975464291c59a85097d38ed.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dukexajuj/zagopuvosivepojaritopan.pdfIn PDF document text
    • https://s3.amazonaws.com/najipavez/topology_optimization_ansys_manual.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_off00010144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10144 5436 bytes
SHA-256: 3c9617dd148915e5a5efb1996d5f1817e9e678f96abb4d8eeb7d4c5631a409d2
font_01_sfnt_off000113af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AF 11144 bytes
SHA-256: 3d3ecfa2745b939834233210838266bc420202137b4a422bb8a7f51276f55a0c

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