Malicious PDF — malware analysis report

Static analysis result for SHA-256 58b94eba7ffe3148…

MALICIOUS

PDF

78.2 KB Created: 2021-09-12 05:30:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: decb16db633dde2533f36dd3eafc5f02 SHA-1: 90ce4df6083c416eb5405e279916b94648d8a589 SHA-256: 58b94eba7ffe31487a89f3a1d900b8979fbab739c4307d720f3fd11c7dc1cbea
174 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, with one heuristic specifically identifying a 'Browser extension / update installation lure'. This suggests the document's primary purpose is social engineering, aiming to prompt the user to install malicious software or provide credentials. The presence of embedded JavaScript and the nature of the lures indicate a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://fs-select.com/images/blog/file/zebotikarukedumigifejumo.pdf In PDF document text
    • https://dp-engineers.com/admin/userfiles/file/zilomunixifi.pdfIn PDF document text
    • http://veitali.com/upload/files/fujomamim.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/86597287788.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/zadosewikotilo.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/dorixafudizizoto.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/99147118722.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138c393e33dd---toregab.pdfIn PDF document text
    • http://we-women.de/default/files/uploads/file/teveluvezamuvox.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/davufavimabimejoj.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/sasugigejubu.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/jeravaginavemex.pdfIn PDF document text
    • http://miyisz.com/mingyi/images/userfiles/file/49475569856.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/warutipetunoxufidikot.pdfIn PDF document text
    • http://zeci.nl/im/image/xavepixuzevadowodato.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/fovosojurofupa.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/41073239435.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/galixufudosuk.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313b2566575---97720777000.pdfIn PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/75643463063.pdfIn PDF document text
    • https://vinacoma3.vn/userfiles/file/28658859875.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/bagoxon.pdfIn PDF document text
    • http://charivne.info/images/file/56396474816.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/nebudulujisi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=ad+free+browser+apkPDF link annotation
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/6849334192.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_off0000cdd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD9 10452 bytes
SHA-256: 095a10c4c98e1f32ba5e1f257e30f9f5bf0f444b70489da022481616ed5aac57
font_01_sfnt_off0000e591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE591 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fda3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA3 17584 bytes
SHA-256: ddeffc0c9767e07d74e0670696b7ee664017edd6d0100d9eddc9bae192aa96ee

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