Malicious PDF — malware analysis report

Static analysis result for SHA-256 5740cdb705f94aa5…

MALICIOUS

PDF

84.6 KB Created: 2021-09-16 16:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fe62fa061a98f55c9244df7426a2c9da SHA-1: f02139901c0c88aff5d26db8f8487fd52249ca80 SHA-256: 5740cdb705f94aa5fe573eaa180189d89db4e3cbc6fcf6768ca49d014768d78f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, with high confidence. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The PDF also contains numerous external URIs, suggesting it is part of a link farm designed to redirect users to potentially malicious sites, consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://nomylo.ru/uplcv?utm_term=how+to+send+files+from+android+to+macbook+via+bluetooth PDF link annotation
    • http://186086.com/upload/files/45722089137.pdfIn PDF document text
    • http://integrotech.com/zdjecia/file/zotoxoratolukalufovinun.pdfIn PDF document text
    • http://lovepetclinics.com/file_media/file_image/file/22465133781.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/movaziwo.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/161334c2dc2d28---fexokebelufegototupave.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/40386890939.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/lenem.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/5629130240.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/bilirikajefisalu.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109080247058293.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/13422076937.pdfIn PDF document text
    • http://vietdubai.com/userfiles/file/vugir.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/66752528164.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/wevonedevikafekodomezida.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/15921598471.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/jubibakaraxobemuzezigal.pdfIn PDF document text
    • https://x-software.cz/data/file/pusasoxoduvusunixideveru.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/menitojapexaz.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/86811849979.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/lopidojetumanikir.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/biwobumivumugu.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/fujupimizud.pdfIn PDF document text
    • http://favorit.pl/userfiles/file/74879371903.pdfIn PDF document text
    • http://vietcem.vn/public/default/ckeditor/files/bokivafagupojobodineg.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_off0000dee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FD 11216 bytes
SHA-256: b32404b5779a25d106d96fbbc2aa4a5bc6c0379a3f1824cbfeed6d13e903e8a3
font_02_sfnt_off00011115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11115 19652 bytes
SHA-256: e17b80b778cf8a4d976b1f0a3b9e7340eb4bc72838e21f4bdc6bf02150024acd