Malicious PDF — malware analysis report

Static analysis result for SHA-256 31113c2ff10bb68e…

MALICIOUS

PDF

75.8 KB Created: 2021-03-14 18:44:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 276de3b2356a7ce245ea29276358b086 SHA-1: 97a62370aacb85f8f76ab276b90154ac67b1921e SHA-256: 31113c2ff10bb68e64eec0285881fc9b2d50e3c264b6196cc2cc40c56313fe49
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://kuzutuzo.ru/strik?utm_term=what+is+meant+by+a+whole+number PDF link annotation
    • http://pogawubujogeje.mypressonline.com/pakajujoxixezogupala.pdfIn PDF document text
    • http://wapividazofar.scienceontheweb.net/jalijinagosida.pdfIn PDF document text
    • https://cdn.sqhk.co/sisalubitot/USqBu1b/30521156504.pdfIn PDF document text
    • https://cdn.sqhk.co/wanukawuwota/YEDsz3g/25278789855.pdfIn PDF document text
    • https://cdn.sqhk.co/nawakema/EylOihi/adventure_island_nes_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/woluzadeviv/cieijhg/guwomuwakokilasoxakaju.pdfIn PDF document text
    • http://daburus.iblogger.org/lutosometepom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393486/normal_60288fbeda71e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471081/normal_5ffba69f52081.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478685/normal_5fd661a968df9.pdfIn PDF document text
    • http://joxoganatiwo.iblogger.org/barron_s_6_gre_practice_tests_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480589/normal_60206014f25d4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450439/normal_5fe48d58c96b0.pdfIn PDF document text
    • https://cdn.sqhk.co/wisisatofife/chfujaQ/alienware_desktop_x51_r3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tadipakajare.rf.gd/72722040711.pdfIn PDF document text
    • http://zevesijuduma.atwebpages.com/high_school_courses_needed_to_become_a_real_estate_agent.pdfIn PDF document text
    • http://vosujepagukag.epizy.com/91693686157.pdfIn PDF document text
    • http://tewifasizibag.epizy.com/pleomorphic_adenoma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b5fc88f-190e-4007-aee7-2ce2ea15ff01/2_nephi_31_commentary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ac9256c-235a-47c7-979b-b58156029292/nixon_sentry_38_ss_a450.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/250d17e7-1908-4950-b5b6-c87b55293f19/which_element_has_2_valence_electrons_in_the_2s_sublevel_apex.pdfIn PDF document text
    • http://pejasevolebik.rf.gd/stealth_attraction_program_review.pdfIn PDF document text
    • http://xejidomu.rf.gd/85492922017.pdfIn PDF document text
    • http://jiporiri.rf.gd/75623092043.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_off0000e847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE847 5272 bytes
SHA-256: fc188f323e9aba847cb3a0498ff2adbb3bf65fd207f61d9e83937b3ba2b3d74b
font_01_sfnt_off0000fa20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA20 11828 bytes
SHA-256: b40e585cfbdf540c71aed8cfcaf1d401d24e4d002eb40e20264eefac2681d316