Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ffea594604d343c…

MALICIOUS

PDF

84.6 KB Created: 2021-04-05 01:26:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 92d2743e36b724ce1ff11a21f54092b9 SHA-1: 5ad7e214f36d33535a8f1204980db1b34752ad2b SHA-256: 0ffea594604d343c528a6dfec96fcbe8ceeedcd09c00bd81c3b5ee98536513b1
126 Risk Score

Malware Insights

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

The file is a PDF that contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically as a phishing or trojan delivery mechanism. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM suggests the document is designed to host many links, likely to redirect users to malicious sites.

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://nipisod.ru/award?keyword=aged+care+award+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374175/normal_604dbb1d4917d.pdfIn PDF document text
    • http://dabagulifi.22web.org/5098312268.pdfIn PDF document text
    • http://deutschebank-meine.com/mexotayz3sz.pdfIn PDF document text
    • http://fly-drive.online/belkin_n_wireless_router_firmware_update_f5d8233-4v3xlqtl.pdfIn PDF document text
    • http://sikakapu.medianewsonline.com/green_smoothie_detox_diet.pdfIn PDF document text
    • http://nunegotopexipo.iblogger.org/vikibakapavidixilagon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383923/normal_60621566c8046.pdfIn PDF document text
    • http://poguzozod.sportsontheweb.net/experimental_techniques_and_instrumentation_lecture_notes.pdfIn PDF document text
    • http://vurovolapoza.mygamesonline.org/computer_abbreviations_quiz.pdfIn PDF document text
    • http://mawifit.iblogger.org/75962573519.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490125/normal_5fe847203d442.pdfIn PDF document text
    • http://erogancolumbia.site/logenotesegexum8bdyl.pdfIn PDF document text
    • http://wozilimesiz.mypressonline.com/complications_of_meconium_aspiration_syndrome.pdfIn PDF document text
    • http://13millions-warzone.store/74893661247duuzz.pdfIn PDF document text
    • http://povulofi.mywebcommunity.org/boss_rc_300_manual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378157/normal_5ff4edd1328aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374024/normal_605826f5ae406.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sobogasitizi.epizy.com/nivitomu.pdfIn PDF document text
    • http://forezepolutaju.onlinewebshop.net/spt_air_conditioner_wa-1220e_manual.pdfIn PDF document text
    • http://gagolabirej.atwebpages.com/17181886171.pdfIn PDF document text
    • http://koradanizepagow.myartsonline.com/criminal_law_llb_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e647475f-d7ea-4b56-a600-f50162c02697/22366925696.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b403d03-a96c-42f1-8e7b-630aa72d937b/what_happened_to_nico_after_the_blood_of_olympus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/935f69f2-086a-4a2c-9326-bae0a914155c/el_amor_en_tiempos_de_colera_resumen_corto.pdfIn PDF document text
    • http://bizepusozuj.epizy.com/diwuroxoveziwilep.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_off00010dda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDA 5196 bytes
SHA-256: 1ee3aba7d84babe853af4af768e222986837cbfba191e7dc7aa622099f1b2a19
font_01_sfnt_off00011fae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAE 10844 bytes
SHA-256: 220e91f3b811306779696d945c4cd7d4b79556e1fa6b23fa7c8b1657c205c8fc

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