Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b2145714c5c6245…

MALICIOUS

PDF

144.1 KB Created: 2021-03-14 09:59:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ba578c2ebc71162ffd9e5058ed9d2750 SHA-1: a00affe7287c6c3a5874129a5cbb16473f119684 SHA-256: 4b2145714c5c624568f344c1ce1abdce4eb31270fbc83b39c4f091e51f451a9c
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics as malicious, including a critical detection for a link farm and ML classification. It contains numerous external URLs, with the primary one being 'https://baarspo.ru/strik?utm_term=what+is+rerum+novarum+all+about'. The PDF structure suggests it's designed to host a large number of links, characteristic of SEO manipulation or phishing campaigns. No scripts were extracted, but the PDF's nature points towards a malicious document intended to redirect users to potentially harmful sites.

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 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.
  • 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://baarspo.ru/strik?utm_term=what+is+rerum+novarum+all+about PDF link annotation
    • https://topudikuwem.weebly.com/uploads/1/3/4/0/134042537/b0a65ca51236930.pdfIn PDF document text
    • http://xenejesujotolud.mypressonline.com/canciones_infantiles_cortas_para_nios_de_preescolar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452173/normal_5fe83842f3b47.pdfIn PDF document text
    • http://vowitufafuzebil.scienceontheweb.net/rozojarutobajimi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393349/normal_6011b0370e7d4.pdfIn PDF document text
    • https://dopozigixojak.weebly.com/uploads/1/3/4/5/134509916/e122a0ddc.pdfIn PDF document text
    • https://duvutotan.weebly.com/uploads/1/3/0/7/130775700/tovelab-bobitiboduziga-tikizunaxetu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366630/normal_604d605f2f147.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/makumapikeze/kufimamojurag.pdfIn PDF document text
    • http://pekotezubefem.rf.gd/rupifazedivefumikexaga.pdfIn PDF document text
    • https://s3.amazonaws.com/titugome/almacenamiento_de_alimentos_en_restaurantes.pdfIn PDF document text
    • https://s3.amazonaws.com/tixeligufokup/momentum_gradient_descent.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/wopar.pdfIn PDF document text
    • http://sadedegigagivaw.rf.gd/20784763760.pdfIn PDF document text
    • https://s3.amazonaws.com/bidurudilidujug/myspanishlab_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/sizabo/kujute.pdfIn PDF document text
    • http://gakamaxoluzes.atwebpages.com/belgariad_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/xubifupi/galer.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/california_dreamin_free_sheet_music.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_off0001fc30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FC30 5140 bytes
SHA-256: c4c5a821b9cf409457fef9b6312b54661d42a51a0f3f26b556b1de7795c12ce3
font_01_sfnt_off00020d8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20D8E 11024 bytes
SHA-256: 20b02bd7779de261d1c9b7afe26bedc06a0f104858d4641b89180eb84df2e2fc

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