Malicious PDF — malware analysis report

Static analysis result for SHA-256 d29f798c77146998…

MALICIOUS

PDF

76.9 KB Created: 2021-09-22 21:36:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9ed2cffae3c4fbcf404620a23c900628 SHA-1: 35f31d84ad53da82aee361c2fa96260a7b04415f SHA-256: d29f798c771469984d71dcf656de223c0bbe037e9b1f3bb4ae9b985bbbf4e59a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. The presence of numerous external URIs, many pointing to disposable hosting, suggests a link farm or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.premiumimport.nl/ckfinder/userfiles/files/junukuzuribofopugogaba.pdf In PDF document text
    • http://jinshi66.com/uploadfiles/files/piwofibenupajux.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/bud089cu5a4998f7ncsilvd1td/vapesazakukilerafama.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/wepagefezujiser.pdfIn PDF document text
    • http://yuha.be/_files/file/vurojikipinosineb.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/terogusigikaguruxinaki.pdfIn PDF document text
    • http://woodwaysindia.com/uploads/jomubowujad.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/161477101bee85---95737582615.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/kobozadegotabigepanenebu.pdfIn PDF document text
    • http://519pf.com/userfiles/files/videlipuj.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/1919109226.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/tefekotozunepenu.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/kuguxomubuzituwo.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/gaxubiwop.pdfIn PDF document text
    • https://derya.afmiletisimajansi.info/resimler/files/tuzixufigelafafopisu.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/86051405155.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/bunowolotixulikomusepir.pdfIn PDF document text
    • https://oasis-travel.ro/files/dixewiwurotagaminudabiva.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613103b504d9e---67311873924.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/3912964560.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/jododa.pdfIn PDF document text
    • https://dienhoanghean.com/upload/ck/files/lanobuvawofimekop.pdfIn PDF document text
    • http://partnercable.com/files/bazeved.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/nikoralimas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=alien+shooter+modPDF 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_off0000cca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BE 10332 bytes
SHA-256: b45ef0a4470a21ac75fa9b404f4c44125ac49de44dcaa834d1a0eb7f8bd61c4f
font_02_sfnt_off0000fbd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD4 16260 bytes
SHA-256: b7a169da94ff707dcd035422b36957223770447df3db6ab0d3eb0af8552d32d7