Malicious PDF — malware analysis report

Static analysis result for SHA-256 407736945daaeae6…

MALICIOUS

PDF

76.3 KB Created: 2021-04-03 23:34:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a604477732c365f8d7f1e9e7ffa529e7 SHA-1: 2396303a404615354d273196149899b8f19b2301 SHA-256: 407736945daaeae6fa97998ec0b0a9ba51959b216d0be9348ae173ff932b21d7
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to disposable hosting and are likely used for phishing or to host further malicious content. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically indicates a link farm on disposable hosting, suggesting a malicious intent to distribute or redirect users. No scripts were extracted, but the presence of multiple external URIs points towards a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/strik?utm_term=landmarks+in+humanities+by+gloria+k.+fiero PDF link annotation
    • https://cdn.sqhk.co/zidulibu/bNoijsR/jayco_propane_regulator.pdfIn PDF document text
    • http://fesotisifofil.mygamesonline.org/cellule_eucariote_e_procariote.pdfIn PDF document text
    • http://mosebuzixat.mywebcommunity.org/oxigenoterapia_en_enfermeria_pediatrica.pdfIn PDF document text
    • http://puwinowelin.medianewsonline.com/savebi.pdfIn PDF document text
    • http://bomepufibawil.scienceontheweb.net/92081688459.pdfIn PDF document text
    • http://nekazupafo.mygamesonline.org/ssc_result_2020_jessore_board.pdfIn PDF document text
    • http://poposiruta.mywebcommunity.org/tuzuxuximagedono.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410015/normal_5fe9417361863.pdfIn PDF document text
    • http://zokidinodajives.getenjoyment.net/aquaponics_systems.pdfIn PDF document text
    • http://wunuvuzixuxi.getenjoyment.net/chaus_english_speaking_books_in_marathi.pdfIn PDF document text
    • https://cdn.sqhk.co/kodivitedi/Mibjjha/original_dune_trailer_1984.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409614/normal_605a7195c1874.pdfIn PDF document text
    • http://butuvaguji.iblogger.org/what_is_a_scientific_apparatus_definition.pdfIn PDF document text
    • http://tadosuzewamu.medianewsonline.com/73869678352.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417139/normal_600bca5149ca5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://refusunono.onlinewebshop.net/grade_5_math_practice_workbook.pdfIn PDF document text
    • http://fuwutowamig.myartsonline.com/domestic_violence_act_kenya.pdfIn PDF document text
    • http://gefuwaw.atwebpages.com/44497545651.pdfIn PDF document text
    • http://gifexepes.rf.gd/7104385824.pdfIn PDF document text
    • http://nibemodida.myartsonline.com/12218657433.pdfIn PDF document text
    • http://gitodake.myartsonline.com/american_dv_lottery_2020_application_form.pdfIn PDF document text
    • http://vefagukolile.epizy.com/ignou_assignment_front_page_format_2019.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_off0000e933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE933 5600 bytes
SHA-256: 1611131e61ec3bdacffab9e5c1f7441816e15c18ba0d1d8071fa644632bb636f
font_01_sfnt_off0000fc27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC27 11172 bytes
SHA-256: 4c528487e7f7c04b3cd975bf18b5df11f7be3f7305f179ab9703fe7153aec9da

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