Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1d39a8e3973c1b2…

MALICIOUS

PDF

70.4 KB Created: 2021-05-05 15:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 4e5a4edb63f0ff9926439f0f207641a9 SHA-1: e5e838701d45658455973028d298bc4231947d2b SHA-256: d1d39a8e3973c1b2edbcc7414ceca27cc75f837e373ca5c8cd0c94cb31c60592
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users to malicious content. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' strongly suggest malicious intent. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment. While no scripts were explicitly extracted, the structure and URL patterns are typical of phishing lures or malware droppers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/strik?utm_term=united+colors+of+benetton+size PDF link annotation
    • http://bbbbbbbbeeee.space/18915427743mftoh.pdfIn PDF document text
    • http://migerov.xyz/solucionario_mecanica_vectorial_para_ingenieros_dinamica_11_edicion319uf.pdfIn PDF document text
    • http://tomandbxof.site/29098441368bli0a.pdfIn PDF document text
    • http://itawegan.space/irish_declaration_of_independence1yff8.pdfIn PDF document text
    • http://lassituda.online/68875024325aalxq.pdfIn PDF document text
    • http://mezajozugabaso.getenjoyment.net/8849632132.pdfIn PDF document text
    • http://erogancolumbia.site/252846580386tmmf.pdfIn PDF document text
    • http://myirn.icu/fender_twin_reverb_circuitavbk6.pdfIn PDF document text
    • http://wofijitabudo.22web.org/64100259860.pdfIn PDF document text
    • http://bcpzonasegurape2-viabcp.com/how_to_size_mitsubishi_mini_split1yfly.pdfIn PDF document text
    • http://mastera-saydinga.ru/bowiwamupec67.pdfIn PDF document text
    • http://esclub.pro/grand_pixel_royale_battlegrounds_mobile_battle_3d_apkpure119e5.pdfIn PDF document text
    • http://fabermanufacture.ru/manixifobafanotujejoboreeba5e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://budokukikaririd.rf.gd/19971409550.pdfIn PDF document text
    • http://medazupu.onlinewebshop.net/tamokanegis.pdfIn PDF document text
    • http://vigiwadovu.epizy.com/29269454973.pdfIn PDF document text
    • http://vanogete.epizy.com/tv_guide_tonight_itv.pdfIn PDF document text
    • http://senesijosezetu.myartsonline.com/jugowilarowedijas.pdfIn PDF document text
    • http://natexekazedap.epizy.com/16915525148.pdfIn PDF document text
    • http://bugazepoja.onlinewebshop.net/17198808740.pdfIn PDF document text
    • http://xeravujowa.epizy.com/analog_lab_4.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_off0000d6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B0 4988 bytes
SHA-256: bfedba003a7e535e51cd54252c64f8515108e080cd87e24e41d58abd56609cb8
font_01_sfnt_off0000e7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BE 10640 bytes
SHA-256: 18bdaa3dab799178ad13fe653e2beabd8438b3d3ca528979bbd23ee1c81740c2

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