Malicious PDF — malware analysis report

Static analysis result for SHA-256 c30b43d609ad97ef…

MALICIOUS

PDF

85.8 KB Created: 2021-04-26 07:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2b3ac16b07d19a27c39ae887f760afa SHA-1: 355880a489c8f6c7de1aac1921411024830b0940 SHA-256: c30b43d609ad97ef5ba29260610f24102709915d9afab4c1ba6b6a5a412a79df
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though heavily obfuscated, appears to be a lure related to a popular book, directing users to a URL that includes 'utm_term=latest+john+grisham+book'. This suggests a phishing attempt or a download lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jumiwimov.ru/strik?utm_term=latest+john+grisham+book
    • https://cdn-cms.f-static.net/uploads/4371787/normal_60470b316bbdb.pdf
    • http://girepodemaz.getenjoyment.net/senutowunav.pdf
    • http://mamefumiwuto.mywebcommunity.org/vonimutelil.pdf
    • http://zujewubowufonug.scienceontheweb.net/wevarubamozaselamulires.pdf
    • http://gexomafe.mypressonline.com/maths_syllabus_stage_3.pdf
    • http://jifarobajis.sportsontheweb.net/xusonujagabasaponusum.pdf
    • https://static.s123-cdn-static.com/uploads/4425492/normal_6000888d5e434.pdf
    • http://xanusojuruxu.sportsontheweb.net/heats_of_reaction_and_hesss_law_lab_flinn_answers.pdf
    • https://static.s123-cdn-static.com/uploads/4460946/normal_5fde6ffc525ab.pdf
    • http://lezigovedavide.getenjoyment.net/benjamin_graham_books.pdf
    • http://megalit-korolev.ru/animal_farm_full_book_summarym2zi7.pdf
    • http://zekabor.iblogger.org/lenovo_ix2_nas_software_update.pdf
    • http://libralab.digital/is_50_shades_of_grey_a_good_bookdk420.pdf
    • https://cdn-cms.f-static.net/uploads/4479214/normal_606e3a6c8c443.pdf
    • https://cdn-cms.f-static.net/uploads/4456165/normal_60322a8febd74.pdf
    • http://retoxen.mypressonline.com/37370978759.pdf
    • http://7lessons.fun/lepukonebubexowolafiwur9vmt6.pdf
    • http://nutosuvitiraj.scienceontheweb.net/aptitude_questions_and_answers_for_tcs.pdf
    • http://ejinaya.com/bissell_powerforce_compact_bagless_vacuum_21129oppr6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dodadugiwajazar.rf.gd/why_is_my_netgear_n600_router_so_slow.pdf
    • http://dojafeduzig.myartsonline.com/75847972901.pdf
    • http://pidodexogejax.myartsonline.com/buku_kebutuhan_dasar_manusia.pdf
    • http://fixuwebevu.epizy.com/cadver_exquisito_agustina_bazterrica.pdf
    • http://videwebik.epizy.com/how_to_get_voice_turn_by_turn_directions_on_google_maps.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000111c6.bin
1357e60ed9d48f773e2fcb4e513d4e298a1430ddd6238ce87de09aef7a22fe68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111C6 5288 bytes
font_01_sfnt_off000123a0.bin
7ed0f725c529742643b2c37f47123af27394790cda640c99c06654cc848cb018		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123A0 10872 bytes

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