Malicious PDF — malware analysis report

Static analysis result for SHA-256 db3d8f53d153c1cb…

MALICIOUS

PDF

65.6 KB Created: 2021-09-18 09:15:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 670487cf15567f71d8100d3d46ec0d9e SHA-1: 98a154bd783f576cf6d241d08de25f6763ab23b3 SHA-256: db3d8f53d153c1cbc9a881b9e67ebc3264f238f6c9f0dd20f23ad2dea0fd32c1
172 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript and multiple external links, many of which point to disposable domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, suggesting the primary goal is to redirect users to malicious content. The embedded JavaScript likely facilitates the execution of a second-stage payload, potentially exploiting a client vulnerability.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6824

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
  • 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
  • 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://medvor.ru/uplcv?utm_term=aniquilame+1+pdf PDF link annotation
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/32938724055.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78369940661.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/15368595747.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613932df10b50---bupolaboja.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/30147320173.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/33711975269.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/2460161691.pdfIn PDF document text
    • http://dakdekkersindex.nl/images/uploads/zoliguzojebegenasuvujub.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/notino.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/97720793948.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/tififugi.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/divexufak.pdfIn PDF document text
    • http://linza-market.ru/upload/files/pipateviji.pdfIn PDF document text
    • http://autostyle-japan.com/js/upload/files/taxavawurijalub.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee10646406---49053169545.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/lejemugot.pdfIn PDF document text
    • http://www.prakashirrigation.com/uploads/fck/files/tizizufominiza.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/60923387211.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/merepitux.pdfIn PDF document text
    • https://mackbeks.com/files/file/wizamezuzibuxefa.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/lejufedozotoxagut.pdfIn PDF document text
    • https://apluskleaning.com/admin/images/file/rapumetasowumaxeva.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/suzavozezipudutilimidu.pdfIn PDF document text
    • http://sro52.ru/uploads/files/kozupibuvabamudurobir.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/xusubumebi.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FF 10452 bytes
SHA-256: 6b7cd51753a830c6c8dacf9a7c9c46e4c915a2bffceb56105b5423e6cc1659ec

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