Malicious PDF — malware analysis report

Static analysis result for SHA-256 114439c54bdc24c0…

MALICIOUS

PDF

83.5 KB Created: 2021-09-18 01:25:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b3f8c08d87df767b04e44df18bf3c29e SHA-1: 392b7cfcb200a5f38bf526fe3830dab481ac5755 SHA-256: 114439c54bdc24c09e22f35cb50ae526444cbb632026c900cb380dff799d7c40
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document likely uses a network of links to obscure the true malicious destination, suggesting a downloader or redirector pattern. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to exploit vulnerabilities or deliver further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://recko.ru/ckfinder/userfiles/files/putoja.pdf In PDF document text
    • http://buddhavehicle.com/userfiles/file/vizij.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/seweku.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/49268664679.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/xapabozigurus.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/94324750644.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/wigodi.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/92828428215.pdfIn PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/jadotos.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109091107042233.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/virojevafujakefurizesixa.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/busukokokasudesokib.pdfIn PDF document text
    • http://fitviewer.de/files/file/tupuvibipozedisatogavig.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/xulagimoludopakovozil.pdfIn PDF document text
    • https://promenade-perpignan.com/userfiles/file/65129061940.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/66954977435.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/sepixobawixovobena.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/84637580482.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/padoxirekavanuxi.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/vufabure.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/72511019801.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16143e6fc3ca1c---deniboxufenuga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=watch+brooklyn+nine+nine+season+7+onlinePDF 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_off0000e1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FC 10716 bytes
SHA-256: f6017117036cca67ea62cf3d6b96163591675a1444ca01e368e7947103dc33c0
font_01_sfnt_off0000faac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BE 17524 bytes
SHA-256: 31e9062aa1161b5730a94f3d67e9f81d7e6ef326180e766ac53fa1a2f27aa289