Malicious PDF — malware analysis report

Static analysis result for SHA-256 c83b311e900a3d2a…

MALICIOUS

PDF

77.1 KB Created: 2021-09-20 09:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 60c5e1763dbc1a7d4228322b22704d65 SHA-1: 58b4f7fb6e954d04353103acb2d0aafa0ff4a47f SHA-256: c83b311e900a3d2ad5f629bfeaf3a300a0b50eac9de0b6a862f1230cfaf90a6e
214 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains embedded JavaScript and numerous external URIs, many pointing to disposable hosting. The presence of 'SE_PASSWORD_ARCHIVE_LURE' and 'SE_BROWSER_INSTALL_LURE' heuristics indicates a social engineering attempt to trick the user into downloading a password-protected archive or installing a malicious browser update. The embedded JavaScript likely facilitates the execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 https://smidgel.ru/uplcv?utm_term=test+apk+android+emulator+online PDF link annotation
    • http://symbioticlifetech.org/attfile/fckimg/file///2021092075937_1034198596.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///21682106767.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/7016729371.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210918/file/16319738667757.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/fugiladivafakopexasuxu.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/f30777802300db38f0ad04a17829a0d4/likufaxefajibad.pdfIn PDF document text
    • http://lehnerkom.de/images/uploaded/file/banumonugavop.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/67824091535.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/vamadakikowo.pdfIn PDF document text
    • https://egca.fr/userfiles/file/jerurizogibe.pdfIn PDF document text
    • http://ossokahve.com/upload/file/77404435166.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/9afaed0fca04ad150ce9dbe4f05ff2e7/81353592435.pdfIn PDF document text
    • http://selidbe-beograd.info/files/49739625108.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/suferupanom.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/34230112291.pdfIn PDF document text
    • http://quaisetoiles.fr/img_pages/file/sowunuwejijowibizofalu.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/60600893326.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents/files/15296115508.pdfIn PDF document text
    • http://ajitcoatings.com/uploads/natodenetidi.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/jukuruzokisolemipobaxi.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/putugudixow.pdfIn PDF document text
    • https://crbz.ru/userfiles/file/83436334705.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/39007152955.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/67817434946.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/7475960508.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_off0000ca1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA1A 10708 bytes
SHA-256: 0c535bda0c2fee57ffee5432a019727bf53acffacf1b90f7eac67920f8a1cefb
font_01_sfnt_off0000e2aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AA 16908 bytes
SHA-256: 0389984eab2753dee099e323ed7648c5207eecd16ae6b21e4e63b58d780c2fac
font_02_sfnt_off00010e8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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