Malicious PDF — malware analysis report

Static analysis result for SHA-256 de1a1a911edcd9a5…

MALICIOUS

PDF

86.8 KB Created: 2021-10-01 03:11:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d8ecbe2131110f9b0dc9e7f1b3e2b457 SHA-1: 39f6444fc1fe4ab3639cf7cc9d0f1832fbacd5b3 SHA-256: de1a1a911edcd9a5db1b25d56d74924956175be26bcb9b4898c2e20bca3524d9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or redirection scheme. The presence of external URIs and the heuristic PDF_SEO_DISPOSABLE_LINK_FARM strongly suggest the document's purpose is to direct users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://crysiq.ru/uplcv?utm_term=ph%E1%BA%A7n+m%E1%BB%81m+t%E1%BA%A3i+video+tr%C3%AAn+youtube+cho+android
    • http://ntvietnga.com/upload/files/dixezofakon.pdf
    • https://mai-avto.ru/upload_files/file/mewati.pdf
    • http://www.alborada.es/ckfinder/userfiles/files/xajowep.pdf
    • http://www.childofafrica.org/media/userfiles/file/36507765278.pdf
    • https://sproname.com/files/userfiles/files/tiruzamomiminivu.pdf
    • http://wiskind.com/filespath/files/20210920161820.pdf
    • https://alteanetworks.fr/img/file/jivamozas.pdf
    • http://omni-links.com/images/blog/file/gogovikezo.pdf
    • http://www.web-globus.de/ckfinder/userfiles/files/92410828396.pdf
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/59900059570.pdf
    • http://muzycznescyzoryki.pl/userfiles/file/74163377476.pdf
    • http://seed-hongkong.com/uploads/file/fujexivozelub.pdf
    • http://sooam.com/files/fckeditor/file/206794103161339b3d13815.pdf
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/jovedezeguzutetufipebu.pdf
    • https://stpm-sa.com/userfiles/file/pokafuj.pdf
    • https://investincarpathians.eu/app/webroot/media/files/dafaviwiwitimixutejo.pdf
    • http://mayinluatudong.com/uploads/userfiles/file/nilinepi.pdf
    • http://srilakshmienterprises.net/uploads/rinelimumelakisilelug.pdf
    • https://karlholmbygg.se/UserFiles/files/30667865054.pdf
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/2134763921.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614039d044c2b---vevomuzomobojon.pdf
    • https://flomogroup.com/upload/files/60570381110.pdf
    • https://pasarantogel2.com/contents/files/taputolubo.pdf
    • http://asu78.ru/userfiles/file/tovofarerupuj.pdf
    • http://packagingandfoodmachinary.com/userfiles/file/lidegotedafogimeridu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd91.bin
8a9939f7d45eb7554fad27a6c00949949471cd4e900ed1159776dc7f3568657c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD91 29648 bytes
font_01_sfnt_off00011893.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11893 16792 bytes
font_02_sfnt_off000130aa.bin
b4ffd92c57a6013d90b8b2154ad33d57425af028ae8b194fb507db08778cace9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130AA 11628 bytes

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