Malicious PDF — malware analysis report

Static analysis result for SHA-256 3efdf1bf4b445bc0…

MALICIOUS

PDF

76.1 KB Created: 2021-09-18 10:31:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 93d3ecb29469569069564160acaadd48 SHA-1: 14bf01f4995a9f9f0d6e65c1dd04a32d01627a15 SHA-256: 3efdf1bf4b445bc0937c7bfb8cddb574b6614695d2a2c8f923ac1a15b0163232
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous external URIs, many pointing to PDF files on potentially disposable hosting, suggests a link farm or phishing lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://silatur.com/js/ckfinder/userfiles/files/gikijode.pdf In PDF document text
    • http://kirsanov-maslo.ru/uploads/wofumajolusisotaxes.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416fb8750dd---jusodu.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/dakamamepuf.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/3039429158.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/jutotisune.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/fekineteze.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/2379251650.pdfIn PDF document text
    • https://digireg.at/upload/10125373007.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/11136387925.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/46618995354.pdfIn PDF document text
    • http://cartopack.com/Images/file/12483874547.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57425508906.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/paxojufalokakij.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/padubixanumomakisav.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/75734964443.pdfIn PDF document text
    • https://yourdentist.ro/app/webroot/files/userfiles/files/85609711945.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/peluneloguwidakeso.pdfIn PDF document text
    • http://didopack.com/files/61451068700.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210903115126.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/85883996508.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=most+played+auto+chess+gamePDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000deeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEB 16628 bytes
SHA-256: 9b586884918b1c51c06103dfa335b781f8ae6c6941546b74584b46b7c806f4e7
font_02_sfnt_off00010998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10998 10872 bytes
SHA-256: 55b6584b7fd893ed7347ba5efc56bb759719290cefdb106acad71ad52bb405db

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