Malicious PDF — malware analysis report

Static analysis result for SHA-256 2255c866bff232df…

MALICIOUS

PDF

84.6 KB Created: 2021-06-11 01:58:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 5f860ef63372ae0b3aad0f996fa552f2 SHA-1: 054081f9705ca2d10ce8a943fec46f8223a77386 SHA-256: 2255c866bff232dfd29b14dd7925d042f5c219e2bdaf60dca8dc3ff4494776f0
126 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm and a phishing lure, specifically mentioning 'itools 4 crack 2020'. It embeds external URIs pointing to suspicious domains, including synerhu.ru and weebly.com. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for distributing further malware or conducting phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://synerhu.ru/pbw?utm_term=itools+4+crack+2020 PDF link annotation
    • https://bizexolarosazar.weebly.com/uploads/1/3/4/8/134882522/6732385.pdfIn PDF document text
    • https://tidemipevu.weebly.com/uploads/1/3/0/7/130740592/2953146.pdfIn PDF document text
    • https://vunadonugo.weebly.com/uploads/1/3/1/0/131070983/dazumatati.pdfIn PDF document text
    • https://wutupebepa.weebly.com/uploads/1/3/3/9/133997315/b605b74.pdfIn PDF document text
    • https://mofizuzu.weebly.com/uploads/1/3/4/3/134316779/wiliwuzofedez_fumokanudada_zuwasivugefutu_vasexigaxizelup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://wotetidi.pbworks.com/w/file/fetch/144598797/64332039273.pdfIn PDF document text
    • http://rupebaxo.pbworks.com/f/bible_female_names_and_meaning.pdfIn PDF document text
    • http://zuwuzemoj.pbworks.com/f/how_you_feeling_today_answer.pdfIn PDF document text
    • http://tukufidanega.pbworks.com/w/file/fetch/144616290/nedaxisitenekur.pdfIn PDF document text
    • http://zopujoxobug.pbworks.com/w/file/fetch/144612210/how_to_factory_reset_rca_7_voyager_tablet.pdfIn PDF document text
    • http://baxikufop.pbworks.com/w/file/fetch/144884205/new_sinhala_songs_mp3.pdfIn PDF document text
    • http://jumedew.pbworks.com/w/file/fetch/144422616/bitzer_bse_170.pdfIn PDF document text
    • http://duriwug.pbworks.com/f/solve_multi_step_equations_lesson_5.pdfIn PDF document text
    • http://mawasuwov.pbworks.com/w/file/fetch/144701067/22148904862.pdfIn PDF document text
    • http://tinigogazos.pbworks.com/w/file/fetch/145070832/lupaduliw.pdfIn PDF document text
    • http://supulilofib.pbworks.com/f/alibaba_and_40_thieves_full_movie.pdfIn PDF document text
    • http://jowugaredite.pbworks.com/w/file/fetch/145089177/bamub.pdfIn PDF document text
    • http://gamaxidad.pbworks.com/f/nespresso_aeroccino_milk_frother_not_working.pdfIn PDF document text
    • http://zixereves.pbworks.com/w/file/fetch/144688638/36875431095.pdfIn PDF document text
    • http://ronefete.pbworks.com/f/artemis_fowl_the_eternity_code.pdfIn PDF document text
    • http://wotetidi.pbworks.com/w/file/fetch/144835335/the_gift_of_the_magi_commonlit_answers_quizlet.pdfIn PDF document text
    • http://wenumizelug.pbworks.com/f/daikin_vrv_catalogue_2020.pdfIn PDF document text
    • http://kapetipubi.pbworks.com/f/textos_mal_escritos_para_corregir.pdfIn PDF document text
    • http://rubepikonot.pbworks.com/f/19654091671.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D3 5156 bytes
SHA-256: eda07391cf62e9d5ef8d0cb193a9b6b425d606131285a125c34f967a205a78c9
font_01_sfnt_off00010a63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A63 6976 bytes
SHA-256: 72f459406ed9fd90876833f2f404fbca17c32c9e91faa97bc9c2fd7200bf833c
font_02_sfnt_off00011d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0B 11412 bytes
SHA-256: 64c397d34b71db661f0ca70b9d0a7bd1085d79771105d6e8e2b52603dcb0f62f