Malicious PDF — malware analysis report

Static analysis result for SHA-256 5435f26cb104a267…

MALICIOUS

PDF

90.6 KB Created: 2021-05-13 12:42:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 391787f1775919275112c1b6baa2670b SHA-1: dced46d9f2d78e10fba869cdd51925b57e1f8387 SHA-256: 5435f26cb104a267dd382db77c598835e5e1e7b5379e90ae6a892fa25274eacf
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 0.9998

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://mezovuduw.ru/strik?utm_term=bedtime+bible+stories+to+read+online PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4447880/normal_5fdde1b355b08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369182/normal_60209c2988076.pdfIn PDF document text
    • http://jokegave.mywebcommunity.org/32138761619.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420037/normal_604a11da25a93.pdfIn PDF document text
    • http://lukisasore.mywebcommunity.org/passport_form_annexure_h.pdfIn PDF document text
    • http://dalifajebuxog.scienceontheweb.net/a_fine_balance_rohinton_mistry_quotes.pdfIn PDF document text
    • https://cdn.sqhk.co/xokebuzizo/cjhhe3S/warrior_soul_we_cry_out.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480414/normal_5fcc919f685ed.pdfIn PDF document text
    • https://cdn.sqhk.co/dajuzafum/buAgdKh/fanolubesiruvagukekifapub.pdfIn PDF document text
    • http://giwitap.getenjoyment.net/attack_on_titan_manga_wiki.pdfIn PDF document text
    • https://cdn.sqhk.co/wezopexa/8zeghjg/75773226307.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/galinikagopit/14814826527.pdfIn PDF document text
    • http://fepusum.onlinewebshop.net/xokebegawuponisopev.pdfIn PDF document text
    • http://tonorepunad.myartsonline.com/adjoint_of_a_matrix_3x3.pdfIn PDF document text
    • http://zobovobewuw.epizy.com/how_does_hydrogen_peroxide_therapy_work.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/minolta_srt_201_battery.pdfIn PDF document text
    • http://sulumasofip.epizy.com/nogijitufofozuduzuvobibi.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/hurt_feelings_report_printable_word_doc.pdfIn PDF document text
    • http://berojopuzenon.rf.gd/4th_grade_reading_comprehension_worksheets_free.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_off0001246e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246E 5160 bytes
SHA-256: 18c3ad3e91532d85a817cf1fcfd311e916343503da0c9169f933161de618c78a
font_01_sfnt_off000135da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135DA 10936 bytes
SHA-256: 689e72456048b85d9a7f4980895e9a816f376a6722a0565aa6356e6081e3521e