Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a223895103d4ee…

MALICIOUS

PDF

70.2 KB Created: 2021-09-30 12:29:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 00a6ec31cb1313b6e4117fb04c226a1c SHA-1: c640d8956c75e25f5f39344847173102c3bdf39c SHA-256: a1a223895103d4ee5dd6e720f07e90d1126179868260b088aa720df2fddbd9b3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript, indicating an attempt to execute code within the user's browser or PDF viewer. It also includes numerous external URIs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://pistant.ru/uplcv?utm_term=you+raise+me+up+piano+pdf PDF link annotation
    • http://hophungvietnam.com/app/webroot/uploads/files/vesexevasamuwatoduzi.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/nitudorexexexatexos.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/gexopivir.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/senutolanijokafu.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/56420155554.pdfIn PDF document text
    • http://aimic.com/userfiles/file/jubemiwovuzutuwopidasap.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/gopasedutusuw.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/dosexeramibog.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/nudonon.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/ledakisiruj.pdfIn PDF document text
    • http://marchmontnews.com/imgs/file/fobot.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395128892aa---mapisebog.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/ronagezupu.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202109162210496118.pdfIn PDF document text
    • https://dptech.vn/uploads/files/pisoguji.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/15e84305fa765b619b1231d1d1d9c3ff/fesowotuwafatov.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/duzovufexovumoret.pdfIn PDF document text
    • http://reflita.lt/uploads/files/1234217304.pdfIn PDF document text
    • http://maezawa-jidousha.com/js/upload/files/51604611723.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/40943738337.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/60361552884.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/85000869556.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/novufud.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/ruviguduwo.pdfIn PDF document text
    • https://www.posluh.hr/ckfinder/userfiles/files/78124977332.pdfIn PDF document text
    • 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_off0000b3fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3FA 10596 bytes
SHA-256: 573fec8471cb1df26112f2f079bf67af250d77cc24779494f8ea2fe453fed341
font_01_sfnt_off0000cc24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE436 15400 bytes
SHA-256: a899783c3065a31a423670819c0914acdf6d8b8c6d378ad96368e756b958664a