Malicious PDF — malware analysis report

Static analysis result for SHA-256 9131b1f4b2b091d2…

MALICIOUS

PDF

80.9 KB Created: 2021-09-18 15:34:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0ebc553410c283e2a475c48a73f3385d SHA-1: 4c52898d8007e46f46a449b17221d7c55af90261 SHA-256: 9131b1f4b2b091d26f2535a5fa9fc810c260d822f4bbda602fd6e39c967f35c1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or redirecting users to malicious content. The embedded JavaScript is a common technique for executing malicious code or initiating further downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://cheapmarkt.com/userfiles/file/gosunivapasemi.pdf In PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/fimifigidudonadesami.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/67910830568.pdfIn PDF document text
    • https://www.luxboss.com/ckfinder/userfiles/files/48807424620.pdfIn PDF document text
    • https://lhorizon.ca/uploadHorizon/file/simesivemozan.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/pakokividonadexodom.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/gatokuzeresex.pdfIn PDF document text
    • http://ipceurope.com/assets/file/49979937124.pdfIn PDF document text
    • https://tpk-m.ru/files/file/paludalanazox.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/63846569090.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/83688472877.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/rafukewij.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/waligef.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/904884133.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/74934459415.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/97763329139.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/rerarebemodaviratosiwawa.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/febenokizapexogevigejudi.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/bajodakujew.pdfIn PDF document text
    • http://specialcats.nl/media/files/dujasopapufatixevepe.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/n9sf9vmq7mn1s0u9eqb6oj7fsc/rusubunatave.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/82515323624.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=k+clustering+examplePDF 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_off0000d375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD375 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8C 10788 bytes
SHA-256: 079588d741a2422392c4b456c103d264e775166f7eb5d5a0a10cc9f00d223bfb
font_02_sfnt_off00010469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10469 18948 bytes
SHA-256: 3c8d39c90b8b9af59cccb7f8518b255ae3eabf362b0edaf3e6095e336ddb04fa

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