Malicious PDF — malware analysis report

Static analysis result for SHA-256 36a942914809de43…

MALICIOUS

PDF

102.1 KB Created: 2021-05-31 15:35:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 3452df91b5ed30b54cae8de3febb4449 SHA-1: 52d5cb33e12b89bb8345188c22c225c14e3d7f88 SHA-256: 36a942914809de43157627220f009e09806aa8ae46cdc1da00d2d8cc7e75f6c9
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or SEO spam operation. The embedded URLs and the heuristic firings like PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM indicate a malicious intent to redirect users to potentially harmful content. The ML classifier and ClamAV detection further support its malicious nature, likely as a phishing or malware distribution vector.

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://jacksth.ru/strik?utm_term=baixar+livro+de+did%25C3%25A1tica+geral+piletti PDF link annotation
    • https://vizegibog.weebly.com/uploads/1/3/4/4/134458583/moguwavaviromi-xopigodiw-bososivux-wujuxite.pdfIn PDF document text
    • https://rotarivinevi.weebly.com/uploads/1/3/4/5/134599250/lupezaxa-tiduraramuzaso.pdfIn PDF document text
    • https://beponelife.weebly.com/uploads/1/3/1/1/131164358/93032.pdfIn PDF document text
    • https://gaburizopa.weebly.com/uploads/1/3/1/4/131438784/6098659.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370090/normal_5fc67f1d2f315.pdfIn PDF document text
    • https://bebiluredop.weebly.com/uploads/1/3/3/9/133987060/ninibagagimonezor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426944/normal_604d2dd578dfd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409255/normal_605f3c778940e.pdfIn PDF document text
    • https://luxisawevevolal.weebly.com/uploads/1/3/2/6/132682936/wasasuvobozupax.pdfIn PDF document text
    • https://pobanebutu.weebly.com/uploads/1/3/4/5/134592169/dajinamutalaj.pdfIn PDF document text
    • https://fesalepexixid.weebly.com/uploads/1/3/4/6/134660072/7170182.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379612/normal_60604eea12ea6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455180/normal_600db5a69df73.pdfIn PDF document text
    • https://getomipo.weebly.com/uploads/1/3/4/4/134403721/fikalire.pdfIn PDF document text
    • https://galanutix.weebly.com/uploads/1/3/4/5/134591813/3014719.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409616/normal_606139af1491b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462093/normal_5ff8b59bd6b87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454419/normal_600be9985c4ce.pdfIn PDF document text
    • https://nitetawowi.weebly.com/uploads/1/3/5/3/135301411/jigawegurabixov_zususi.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/2e855b48-d8b3-425c-820a-4b847e947d86/85681499227.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b196e327-2766-4956-a799-d4db49b44883/monitoreo_de_redes_software_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff80e2bf-9ae3-4988-a334-ff6893285b5e/rexoxitimu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f53d806-d986-4be7-b5ac-2009b5bdc78d/26104638513.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_off000148d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148D4 5476 bytes
SHA-256: 10dd3c54401561ed559f312c1bfda16ceb37309cabf4256174fa7066445be7e1
font_01_sfnt_off00015aff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AFF 15812 bytes
SHA-256: ef199af1e383d0231647cb5a286e432bafaf0a2c00b7ef6d26cf927cc9d2e535