Malicious PDF — malware analysis report

Static analysis result for SHA-256 41941e7856c26de8…

MALICIOUS

PDF

74.4 KB Created: 2021-05-17 14:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: ed770c480898839d485a4d6c87989e20 SHA-1: 929727cbb28d294dea99a0f99cedbd0f2248900f SHA-256: 41941e7856c26de845ce0e54675ebc89f830b768086d11b93b0445e246efc669
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO link farms or phishing campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content, masquerading as a legal document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/strik?utm_term=how+to+write+a+law+personal+statement PDF link annotation
    • https://jiwebatije.weebly.com/uploads/1/3/3/9/133997557/joxoxan_gegasebotu.pdfIn PDF document text
    • https://serataxufo.weebly.com/uploads/1/3/1/6/131606193/vozefisexilar-disebibefogid.pdfIn PDF document text
    • https://devojakosumu.weebly.com/uploads/1/3/5/3/135314674/69c63a1907.pdfIn PDF document text
    • https://vewutuzukep.weebly.com/uploads/1/3/2/8/132815207/jeteza.pdfIn PDF document text
    • http://fukiwurezopukof.mywebcommunity.org/axial_scx10_3_rtr.pdfIn PDF document text
    • https://supenavasude.weebly.com/uploads/1/3/5/3/135397397/woropagovewof.pdfIn PDF document text
    • http://yogist.fun/ingenuity_cradling_bouncer_morrison_instructionss5kwg.pdfIn PDF document text
    • http://labiosdewonda.com/frostgrave_bestiarywrf8d.pdfIn PDF document text
    • http://gbo.guru/guzuxexonowbta0.pdfIn PDF document text
    • https://gepavemu.weebly.com/uploads/1/3/4/8/134861499/xebol.pdfIn PDF document text
    • http://busimaderule.mywebcommunity.org/how_to_make_beer_at_home_step_by_step.pdfIn PDF document text
    • http://nibelv.xyz/58964390777hnwak.pdfIn PDF document text
    • http://jijoxep.getenjoyment.net/17039996226.pdfIn PDF document text
    • http://zoomita.space/almanak_2019m953e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d89d6b52-6e76-4e18-bccb-bd7428cfddad.filesusr.com/ugd/02beb7_44e97d67563c43289cb9b144eff41148.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9df12e48-54f7-4d53-863b-12f6c1e48027/kavofa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d28d3fee-0e42-4740-a6a8-3a12cd0dfff6/61791436991.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b5225a4-44df-4869-a437-f21e55f5d187/69488719088.pdfIn PDF document text
    • https://0cc2a7d0-6f33-4335-9ec9-554d9418487e.filesusr.com/ugd/cb4a18_e2ad90cfc6b34f0fa0d8eb2faa74152d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f749da5c-d505-49ce-a5e2-d3d023343984/biblia_de_estudio_teolgico_reina_valera.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40f5945c-5bac-448a-8804-1717626056d4/how_do_i_fix_the_resistance_on_my_exercise_bike.pdfIn PDF document text
    • https://3175e58c-9db9-4d87-bcb9-15e03531d93d.filesusr.com/ugd/c93210_569d69b5eedc407a90827e0730727971.pdf?index=trueIn PDF document text
    • https://19004eff-8f5e-45b0-b15a-9fbdbd99e39d.filesusr.com/ugd/578ea4_fec700825da943f8aa711cb39c1a2d30.pdf?index=trueIn 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_off0000e699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE699 5016 bytes
SHA-256: e5597efdf1a3f686ed6142d461fcd574ab473064458a548da26e094c8bef53c2
font_01_sfnt_off0000f79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79B 10900 bytes
SHA-256: a4f32e4c94139d30aa3ce2ca216a3a9ae436e9863bd74e37f888e1c5bb041b87