Malicious PDF — malware analysis report

Static analysis result for SHA-256 93894ab9288e84fd…

MALICIOUS

PDF

76.8 KB Created: 2021-09-21 22:38:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 90effe524dcd8a663aabe796f056ad1f SHA-1: 90b6758099b878d6439fe52e63bf974acd1b4941 SHA-256: 93894ab9288e84fdee4edcb0ff0c97387badb15a25553b35b83099eb78025df7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, with one heuristic indicating a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or credential harvesting. The presence of embedded JS points to potential exploitation or redirection mechanisms.

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 https://network-italia.it/file/sevekujafezaraluxoxate.pdf In PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/miwuzoxekixakopazetim.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/54512733032.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/80530668206.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/59848315762.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/lofokizirire.pdfIn PDF document text
    • http://jar-ted.pl/file/63113931628.pdfIn PDF document text
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/derajidobipalewul.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/87355261791.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/6175150879.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/bepirufuzatejorovabijimoj.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210902_030047.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/sorazofufu.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/nesabuvor.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/kuzejobonaguwalofe.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/zonesezanezaxazedojabeme.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/vuzirasixasopokuxusoxaneb.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/46268568373.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/54836914836.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133794fdc8b4---81429615035.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/79215203119.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/lonopu.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/87203593784.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=outlook+password+resetPDF 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_off0000c835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC835 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e04c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04C 10492 bytes
SHA-256: 9ba9567193821ad3dec74c900fb0cfd0f4cc54ff394de979a6a96996fc87d658
font_02_sfnt_off0000f871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF871 17588 bytes
SHA-256: 1a96730d17f6663888321e648ec6ecf8b350d024b960d6aad94004cbb09a3b4e

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