Malicious PDF — malware analysis report

Static analysis result for SHA-256 47fc616590d6fcad…

MALICIOUS

PDF

74.4 KB Created: 2021-05-29 05:15:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 6c11dc13bad84c984b1941f4a6770eb8 SHA-1: ed8c6959ae156fb306393bf69f095fe7248a849f SHA-256: 47fc616590d6fcadec1d949e2e687e074c2e205d6dbea44ef46d1b27447f18af
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The presence of the URL 'https://midufefew.ru/strik?utm_term=como+llamar+a+celular+de+peru' and the ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/strik?utm_term=como+llamar+a+celular+de+peru PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490516/normal_600f9ef3c7676.pdfIn PDF document text
    • https://konilusikiwi.weebly.com/uploads/1/3/3/9/133986353/togejerokonifi_rexedenolob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406166/normal_6058358764fc6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4859805/normal_606bfe4744399.pdfIn PDF document text
    • https://tewetakejuduz.weebly.com/uploads/1/3/2/7/132740850/0667479.pdfIn PDF document text
    • https://rejipunedeze.weebly.com/uploads/1/3/4/6/134652096/bobirewidekutigetot.pdfIn PDF document text
    • https://gefivepuli.weebly.com/uploads/1/3/4/6/134620723/7835280.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407562/normal_6036d3c37920f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486566/normal_6056531ed2990.pdfIn PDF document text
    • https://kikokemez.weebly.com/uploads/1/3/5/3/135331375/7433934.pdfIn PDF document text
    • https://tuzulenoj.weebly.com/uploads/1/3/4/8/134866727/ce5523542682bd.pdfIn PDF document text
    • https://xojefuwi.weebly.com/uploads/1/3/4/6/134630926/kibuxib_fevomevol_wubarujipiwif_mabuniloku.pdfIn PDF document text
    • https://jupedozezuwobig.weebly.com/uploads/1/3/4/0/134040413/kudinevoxowufod_pigeba_pabebutapixonu_gugobaroga.pdfIn PDF document text
    • https://nigafabap.weebly.com/uploads/1/3/4/3/134377596/mipubos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0f194b7-a8af-4f39-aeb5-1d1576109d3c/welewifuxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39d971b7-6ea7-4a21-b7a3-a62b33047804/advanced_mechanics_of_materials_and_applied_elasticity_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08581391-f0fa-4773-affb-c7a18f7a27fc/juzor.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_off0000e577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE577 4948 bytes
SHA-256: bb3d664beddad9d2331208e3ca45ee5abb462a9b9bf18beed9bdfa1e3591b3e9
font_01_sfnt_off0000f62d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62D 12096 bytes
SHA-256: 1f26f052c9414e967bb75a207f532d2955cf924f7a12f1f9740438de2422d281

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