Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfb25f8f5b0d1ba3…

MALICIOUS

PDF

86.1 KB Created: 2021-09-12 15:58:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bed94f1ec88cf510db6e1745f5155c7e SHA-1: f88548f5d4276e17f9b75990a82dc077cd517991 SHA-256: bfb25f8f5b0d1ba317c42bfb0e57e9665b078e32180b384249cdb860af84dee7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains embedded JavaScript and numerous external URIs, many of which point to potentially malicious domains. The PDF structure and heuristic firings suggest it's designed to redirect users to external sites, likely for phishing or to download further malicious content. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://shceping.com/upFile/photos/2021-9/file/dibofefitujowitifosal.pdf In PDF document text
    • http://videofilm-tv.ru/content/File/pesipesamexo.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/24066552460.pdfIn PDF document text
    • https://12tiga.com/contents/files/37558951502.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/tawizivelefonumepoxaxaju.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/kugenorerurogepogam.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/61555254172.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/puvivizubolubajoz.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/sugoxunelexovutinad.pdfIn PDF document text
    • http://mawratanews.com/armedia/uploads/files/getemiwisiwiguvij.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/laxomuzoranotoberilomozov.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/mumizewufebeg.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/gowufakokitizina.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/49766980194.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/6710490377.pdfIn PDF document text
    • http://bjallstar.com/upload/file/witino.pdfIn PDF document text
    • https://cebrigantina.com/025-CEB/images-editor/file/95426451735.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/36504276067.pdfIn PDF document text
    • http://ranch.pl/files/file/pelexu.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/zinetevuzabipa.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61345085597.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/rofuzi.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139315fc0c27---zutuvilarawirubirawopo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=psp+psp+emulatorPDF 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_off0000e00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF821 22716 bytes
SHA-256: 82777fbcf6073168dfe741a3a24266702be808591bbb5dd276958140f65e0f94
font_02_sfnt_off00013390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13390 10316 bytes
SHA-256: 98d97e14f0d6bc454b826d24fea395b856a952d79fb1e276f27491f2ca066661