Malicious PDF — malware analysis report

Static analysis result for SHA-256 8225dffca356719a…

MALICIOUS

PDF

70.5 KB Created: 2021-10-04 00:06:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 25bad87e0e97fd50a1f9ed6c1010f1cf SHA-1: 82d44233f51f9da5b259c1121f9fdc969c4aa3ef SHA-256: 8225dffca356719a0e1ac5a2660ae7b4deeb9ce764be1be12dc8333faeda0265
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware. The embedded JavaScript is likely responsible for redirecting users to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://zamaro.cz/images/fcke_files/file/roferiwuzorogosewimibov.pdf In PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/22995982453.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2915bf9f4---gitiwabotanepeg.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/29618736976.pdfIn PDF document text
    • http://polenes.cl/userfiles/file/74191533276.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///56388383386.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/89930235567.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/81121298264.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/42664859574.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/56332915074.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/12477a9ffa4ccef4fdc259f16ebe9ae1/kagavakakixasikusexajox.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/niradixesiwujukapugolef.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/5001769277.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/9634606622.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/geberuvegizigewuxukul.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210902_ABD9AB3E756CCE1E.pdfIn PDF document text
    • http://www.pvvc.cz/files/kopivibamabog.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/161357340b7cc0---guziretuvekafulugiriviw.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/20257424382.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/zizitunebatozofimigaka.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/vinitoviserajixalive.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/83350719919.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=2nd+puc+political+science+textbook+pdfPDF 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_off0000b091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB091 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A3 16616 bytes
SHA-256: 745d2a8859b786734c3c929b7440f4473fc916bb9eb63fd5aef3a4c78b5c8a4f
font_02_sfnt_off0000f2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C9 10968 bytes
SHA-256: abfd334a0ec4f070f1bae04c49758b04b1b7ae44f1ffe0298c2a988ba876b95c

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