Malicious PDF — malware analysis report

Static analysis result for SHA-256 c24c37aad07494b4…

MALICIOUS

PDF

85.4 KB Created: 2021-09-21 04:09:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9c71fb0d3fb4ff892cd00b4d0624d16b SHA-1: 8a615d05fea84cec80924e5855a137f57e3e1ec5 SHA-256: c24c37aad07494b478ab3c7ec6739f94b99f9a1dea9777ee7d7b9e294d06d720
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The document also features a large number of external URLs, many of which appear to be part of a link farm, indicating a probable phishing or malware distribution attempt. The presence of embedded JavaScript and numerous external links strongly suggests an attack pattern involving user redirection to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://oniceh.ru/uplcv?utm_term=malachi+martin+hostage+to+the+devil+pdf PDF link annotation
    • https://bestcoloringpages.com/userfiles/file/kuvunoxegilobuzarowusip.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/loruzavajukarawejufijax.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/magekatow.pdfIn PDF document text
    • http://eikenhorstgroep.nl/userfiles/file/tilubedi.pdfIn PDF document text
    • http://nhungbaithuocnam.com/img-tvdl/files/xafesejeligapi.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/zijiramodusadegeges.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/maritemiruzegajoti.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/2276008891.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/88755576066.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/47430829124.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/nabizezaxi.pdfIn PDF document text
    • http://119pump.net/d/files/dajuvatofetonufumen.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/fuzewuz.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/61447595880.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/vaxiwe.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/mebeworaxadejedo.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/94172984043.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/zoxox.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16136816202580---4194758804.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/tiravelepubomilomi.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/72832682708.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/88717854742.pdfIn PDF document text
    • https://eol.org.pe/ckfinder/userfiles/files/tajexotob.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133abdf98cfc---jisajisij.pdfIn PDF document text
    • 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_off0000e640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE640 11128 bytes
SHA-256: 56f58afe1dc795d308e8c8b003cdd01b7a310b28e5cee7bb2a8fa867209731ff
font_01_sfnt_off0000ffda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDA 18252 bytes
SHA-256: 222841d661ab529d2d44cdf0c80943ecd6be41d9ad4a0245adffccf4f5dea379
font_02_sfnt_off00012f88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1