Malicious PDF — malware analysis report

Static analysis result for SHA-256 4965dc98bcb7973a…

MALICIOUS

PDF

83.3 KB Created: 2021-09-12 19:26:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7de1b9494fb3aa41586711bf1ba27b34 SHA-1: f1db18a1ff5f7518b78fb2b94136c783d4b0a86a SHA-256: 4965dc98bcb7973af0894468ce4af576ba67d1918cc84d098b2f839fb9d78e1e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects the user to one of the numerous external URLs found in the sample, which are often used for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://safarang.com/basefile/files/xivovowilamonegurofumija.pdf In PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210904_2D5F0FF714BB54AD.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/tasor.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dccf0292f8---26864856093.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/vumavipagugeparepipeto.pdfIn PDF document text
    • http://stopguepes72.fr/userfiles/file/4345225803.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/43723590347.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/48526567390.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/pemod.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/lisazirado.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/jozufefesisukonafasajoti.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/pujawexe.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/zedepevovumu.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/161348f7c2b79a---44369984104.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/tusagexapikosej.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/kiwujofogujozo.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/87534307224.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/7082634362.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/levivanijubon.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/92882543655.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/nozexijidajunarureguse.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/bukixinodesa.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/ziforowinowugibenalefid.pdfIn PDF document text
    • http://gkz-crimea.ru/userfiles/file/jatewemitenagelijubato.pdfIn PDF document text
    • http://playoz.com/ckfinder/userfiles/files/vuxeperobetafalil.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/92896719781.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+unlock+moto+g+pin+lock+without+losing+dataPDF 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_off0000dd20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD20 10996 bytes
SHA-256: 99b9f903f9b0eacb578a3ace5505cd65480f93216c29b60647ec3813a2defead
font_01_sfnt_off0000f64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64D 18908 bytes
SHA-256: 773bd0a5ad10012d3a3b4d25de7c7c1dfe73c210db3f6027c20b3e840850fc75
font_02_sfnt_off00012748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12748 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1