Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f9ab59de68cfada…

MALICIOUS

PDF

73.2 KB Created: 2021-09-19 19:19:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 84d28d426b6d07ce0d5d88121ee5674e SHA-1: 95725571b46e560804718fca875593dd621d7b94 SHA-256: 5f9ab59de68cfada0281e0f98b2ae8ef2c9f80179fd2c21919945d13ee250011
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating a malicious intent to redirect users or download further payloads. The ML classifier and ClamAV detection strongly support its malicious nature. The presence of embedded JavaScript (T1059.007) suggests an attempt to execute code within the user's browser or PDF reader, likely as part of a phishing campaign (T1566.001).

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
  • 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://www.mbk-montage.nl/ckfinder/userfiles/files/zixonifu.pdf In PDF document text
    • http://cuacuonbinhduong.com/upload/files/68139664236.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/80446353585.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/diwuzolinefamasogifugixid.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/d06cb79e82107f14e6643b2d7d551b38/24403542525.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/93603557308.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/32014661357.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/gapulosolugo.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/59695205917.pdfIn PDF document text
    • http://hausdergesundheit.net/userfiles/files/vigirib.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/90586269996.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/16536956972.pdfIn PDF document text
    • https://almentispharma.com/ckfinder/userfiles/files/fijuma.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/31248288800.pdfIn PDF document text
    • http://zgic.ru/!upload/files/26149676744.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/loxarirosemapelarekulume.pdfIn PDF document text
    • http://hexindechem.com/upload/files/30289020511.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/jugijaf.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/161421f9d47076---59886251898.pdfIn PDF document text
    • https://dodatnojamstvo.com/userfiles/file/duwujatubizojowozuza.pdfIn PDF document text
    • https://vilnius.cvzona.lt/resources/img/files/5998179705.pdfIn PDF document text
    • https://airshow-bg.com/file/xatavubagafefep.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/31118163867.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/dojamelagowejoja.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/pisobitob.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/57441223323.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=joe+fortune+free+chip+codesPDF 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_off0000be0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE0D 15992 bytes
SHA-256: f054d55ec9a46d4e265bbed4cfefee090885afb4a4c2a58b7f6995a5d6aedd42
font_01_sfnt_off0000e707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE707 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1E 10600 bytes
SHA-256: 2ee0207ad724b0226cb64cec3d8726a343dd66e937defafaa249e4855e90d66b