Malicious PDF — malware analysis report

Static analysis result for SHA-256 428e4a95be84f4d5…

MALICIOUS

PDF

73.2 KB Created: 2021-09-12 21:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9ecf4e400188e1c6a8c95f2c79093957 SHA-1: 2ffae6cc68a742be75c63a972b192e6ae55d6ccc SHA-256: 428e4a95be84f4d5fb13c29cfba916ee15c1a52b54363fbae1a8d27cbd885cb2
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to external URLs, many of which are hosted on disposable domains. The heuristic 'PDF_RANDOM_URL_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection or download of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://rehahomecare.com/upload/editor/files/xorenikaxakewomazediluwo.pdf In PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/9371471428.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/54533090318.pdfIn PDF document text
    • http://deltools.com/userfiles/file/milusesebunitufinujavomi.pdfIn PDF document text
    • http://datacomsystems.cz/userfiles/file/bozogeratisoxapuduw.pdfIn PDF document text
    • http://www.polni.si/Images/files/sikinugobemowifovijor.pdfIn PDF document text
    • https://lrdreamteam.com/files/files/file/InfoProduct/file/ditibabuguzotido.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/12608814099.pdfIn PDF document text
    • https://www.l-games.jp/js/ckfinder/userfiles/files/zonixidofonifabemaladanu.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/revovapipuwomeru.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/22616819644.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac09ce36ca---9138058006.pdfIn PDF document text
    • http://selidbe-beograd.info/files/xilewuwefobobaj.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/tixetixe.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/gatuna.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/210909094913887941mfdls.pdfIn PDF document text
    • http://hueide.com/upload/files/80971974218.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/43370191332.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/51643966725.pdfIn PDF document text
    • http://naoshima-habitant.com/images/blog/file/rufilix.pdfIn PDF document text
    • https://laser123.com/geektic/files/sipufowiwiwez.pdfIn PDF document text
    • http://rsst77.ru/upload/files/35983012222.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b61f8c40fb---27169389836.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/pivamepajoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=iptv+smarters+demoPDF 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_off0000bdaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDAA 16348 bytes
SHA-256: 77a91469255aa4f9cdff8fc1ad912d7f629fda3c65f76609d58303d4cd81efa4
font_01_sfnt_off0000e7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC3 10328 bytes
SHA-256: 4b1769da69c56744834313becce5ac9eebcc86fd718400f528a26e5c93fc7928