Malicious PDF — malware analysis report

Static analysis result for SHA-256 0927815c762bb90e…

MALICIOUS

PDF

82.8 KB Created: 2021-09-14 02:14:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 39d6b7f2be472cd862030eeaf32a9990 SHA-1: e3abe50095ad762d78e3c7a2c9152a5ab65818ef SHA-256: 0927815c762bb90ef256220b08a181c9a4a67e7c0546de28840118280560443a
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1566.002 Spearphishing Link

This PDF document was flagged by multiple heuristics as malicious, including brand impersonation for credential phishing and a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. The document attempts to impersonate Outlook to trick users into clicking a link, likely leading to a credential harvesting page. No scripts were extracted, but the presence of embedded URLs and the overall detection profile suggest a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=student+outlook+sign+in.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://faktxeber.com/resimler/files/luvusolizagenesevogo.pdf In PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/vuzilak.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/rilokofurum.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents/files/53832426115.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/93292672742.pdfIn PDF document text
    • https://akvanova.ru/sites/default/files/vifosedoler.pdfIn PDF document text
    • http://fgsconsulta.com.br/ckfinder/uploads/userfiles/files/kuzudilasufokuzam.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/dasamud.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/24316494807.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/6020970586.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/kedaxa.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/52150271590.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/ravafemujisibe.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/ruzuwi.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d181fa68ab---tijip.pdfIn PDF document text
    • http://egyptlance.com/userfiles/file/2202946557.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/43710988461.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/43488996904.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/fapalozazezabi.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/an11t18ek87c6m0mjv63ft4vo2/madusitagolu.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/radofusafiduvabos.pdfIn PDF document text
    • http://lovepetclinics.com/file_media/file_image/file/78884840150.pdfIn PDF document text
    • https://12shio3.com/contents/files/gobidavumaw.pdfIn PDF document text
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/81316912067.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=student+outlook+sign+inPDF 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_off0000dcbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CE 19000 bytes
SHA-256: 08f1cff68df5b73cdfcf33a3596e60a74b618643d4530d2be4f7097a7bd41cd9
font_02_sfnt_off0001265b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1265B 10428 bytes
SHA-256: d99e9cf7abf366a7e436d27ab68bde1cef3e0397ba030efd1475b362f9171041

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