Malicious PDF — malware analysis report

Static analysis result for SHA-256 65adb68fce82d385…

MALICIOUS

PDF

80.3 KB Created: 2021-09-20 00:33:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 28429da3fd3ea57b26af37277d2956ed SHA-1: f12500376b6d1acedfa554de28fc22540544bca4 SHA-256: 65adb68fce82d385d6ac636fd90513828b2e3dfacdc3969adcb82c010468fca8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to suspicious domains, combined with a visual download button heuristic, suggests a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, further supporting the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://webvitamin.vn/app/webroot/uploads/files/52514487316.pdf In PDF document text
    • http://gaytonfa.com/upload/files/20668072803.pdfIn PDF document text
    • https://yifff.se/userfiles/file/butujopujebikinepexolomo.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/46474209093.pdfIn PDF document text
    • https://ienter.bg/files/28015059445.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613101c0315be---vawaredokejir.pdfIn PDF document text
    • https://dcimx.com/files/52630421385.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/worixawimis.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/xavozigazediroforediru.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/85189993137.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/78295008816.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/92787211950.pdfIn PDF document text
    • https://gjbuyerbroker.com/userfiles/file/44511713947.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/judupi.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/51987479453.pdfIn PDF document text
    • https://inks.bg/userfiles/file/doposasusasofebigoda.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/36823314095.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/segabelelorusekofoloroke.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/sanilebijofosimo.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/5623423423.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/90385466560.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/sagobakuriliwomarisal.pdfIn PDF document text
    • https://empresa-venta.hr/files/26886517151.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=undisputed+4+movie+downloadPDF 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_off0000d657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD657 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6E 10792 bytes
SHA-256: 720730df9de70985ec009237d00ce8cad7f62f316ad7cd613fc724fde2597000
font_02_sfnt_off00010759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10759 17284 bytes
SHA-256: 2187cd3733d8d95c59dfc9ff6fd467c6e50567242052659ccec3ff2b2ef8ec1f

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