Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6afd9590384343b…

MALICIOUS

PDF

69.7 KB Created: 2021-10-05 18:30:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 0101705731fb8fb2e03f2a222538b04e SHA-1: 86f078ff370a44ec4f11d6c7a1508b47776af9ae SHA-256: e6afd9590384343b9b52b42e19b18286a74d665ef2c8cd3bfe806ba51870041f
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF is identified as an image-only document designed as a lure, indicated by the 'PDF_IMAGE_LURE' heuristic. It contains numerous embedded URLs, many pointing to potentially disposable hosting, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://balajihighfields.in/userfiles/file/lototuliv.pdf In PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/ruwonugizoma.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/10581232648.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161324d33614b9---verozegi.pdfIn PDF document text
    • http://edallyshop.com/upload/files/10197815735.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/vakeni.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/gijepavenavadeluvit.pdfIn PDF document text
    • http://lemma-studio.pl/userfiles/file/wasumenebevedagekomu.pdfIn PDF document text
    • https://www.ocnistudio.cz/ckfinder/userfiles/files/52641709757.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/lazijalewodamimadelim.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/30429878663.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/11237838260.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/dijadetelip.pdfIn PDF document text
    • http://www.culturehousesun.org/photos/file/muvuturajotafekuxax.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/83703484800.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/77972005777.pdfIn PDF document text
    • https://dental-essence.com/admin/userfiles/file/naludugenumazurakizune.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/rezog.pdfIn PDF document text
    • http://eko-baby.ru/userfiles/file/6802358011.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/pojikalinakasatixu.pdfIn PDF document text
    • http://terrietanaka.com/library/files/xiwutobixujexenam.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/868281247.pdfIn PDF document text
    • http://familiegravesen.dk/userfiles/file/52356093895.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/6beebdd1c84a4e5359ba8068ca63b6e8/xepur.pdfIn PDF document text
    • http://ficfart.org/userfiles/file/teloponu.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/menexowudolule.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/88358532780.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=olympic+lifts+workoutPDF 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_off0000b537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB537 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD49 14264 bytes
SHA-256: 0ea109aad5c0a9f003ac28dd29ec39072344e969f8cf3e392a39e6b4386116ff
font_02_sfnt_off0000f095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF095 10660 bytes
SHA-256: 85d1911c4fac90dec2eef37c25139d8d689322ab9584e999458a91b49da527a5