Malicious PDF — malware analysis report

Static analysis result for SHA-256 d34be5887b93ab30…

MALICIOUS

PDF

67.5 KB Created: 2021-09-25 05:42:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 01c6200baeb72960e534fc2c3a3f5d3d SHA-1: c0b6890f4ec60b8b77548518fb9835bbed896cbd SHA-256: d34be5887b93ab3029a503354c4597e6830e2a16ead7e1c7af9885f03f1fb3fa
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as a phishing lure due to its structure and clickable action. The document body is heavily obfuscated, but the heuristics indicate it's designed to trick users into clicking a link, likely leading to a malicious site or download. The presence of embedded JavaScript suggests an attempt to execute code, potentially for further exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 67 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.
  • 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://emmaushuis.org/pages/7903873411.pdf In PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161320d44a0666---tupofi.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/dewaki.pdfIn PDF document text
    • https://gangnampools.com/contents/files/wilekujaromeje.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/zipoxotabomala.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/84347545895.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/99045190774.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/93444413565.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/27492693237.pdfIn PDF document text
    • http://mgrima.com/files/file/sufuvaforumabeb.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/36137132342.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/livuxazulobire.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96704905022.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/xegesumeder.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/85414339052.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/86131351600.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/90536195073.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/53597268951.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-20/20210920135452938486.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/zeramafewoladusodemazop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=math+games+fireboy+and+watergirlPDF 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_off0000ab1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB1E 14508 bytes
SHA-256: 4fb85608f22b716fab09b96cdf4c1ab3682b7c40ff66cac5b6d1d3d4e0df8301
font_01_sfnt_off0000cf4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4E 11136 bytes
SHA-256: 82a4ac22754faa8d355d3eef75160278d91efff36d9b0429dad993d406013465
font_02_sfnt_off0000e8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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