Malicious PDF — malware analysis report

Static analysis result for SHA-256 18b67c593c1efc4e…

MALICIOUS

PDF

75.1 KB Created: 2021-09-15 17:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2d0836339979232855a5f92589ad30e7 SHA-1: 5528c6007a0122b0298468cc45965140aa58694d SHA-256: 18b67c593c1efc4e1a895a3872a27c8c61565d2cf983683a848790b53784f4e0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. Heuristics indicate it's a link farm and ClamAV detected it as a phishing trojan. The embedded JavaScript likely redirects users to external URLs, as suggested by the PDF_URI heuristic, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://odontologosmalca.com/images/userfiles/file/80020480341.pdf In PDF document text
    • http://brezov-gaj.si/uporabnik/file/93416694815.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/wizolixonililetununewo.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/49810013496.pdfIn PDF document text
    • http://wx-test.com/upload/ckimg/files/202109022015595015.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/39625840676.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/78643962386.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/foditewuxil.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/fukepogotuf.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/37580481586.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/womomizexiwif.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/guxupijem.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/mevujufer.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/95952397062.pdfIn PDF document text
    • https://xn--80ag1a2a.xn--p1ai/files/file/kepofavabuz.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16136e4d49e072---kitiridaguxitewudibod.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/zojoxevenenolorobewo.pdfIn PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/76501606939.pdfIn PDF document text
    • https://claudiodituri.it/uploads/nudogiwixesavuxixug.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/jelupeb.pdfIn PDF document text
    • https://s-oil.hoakhanh.vn/uploads/image/files/30567922823.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/vupikow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=fastboot+reset+tool+downloadPDF 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_off0000ba94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA94 10352 bytes
SHA-256: 179516071b39e8e89f23dbe85973288a0abea735d6557358ffe4ea023f7a8aac
font_01_sfnt_off0000d228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD228 20148 bytes
SHA-256: 4b9f59d7c590f8b57bf09e8ae2024da0b9fde78c1e621bff98955c73bfb8013b
font_02_sfnt_off000106b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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