Malicious PDF — malware analysis report

Static analysis result for SHA-256 211c929aa6d5cd19…

MALICIOUS

PDF

82.8 KB Created: 2021-09-18 02:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e260332cf9069e0da26bfbf974a26437 SHA-1: 551d0e578e35f8138efe93fb111b9110bf62ed8c SHA-256: 211c929aa6d5cd19d65f80b3e269b51069d4ae0fc46fc995f138e932d8c3b6b8
134 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. The PDF contains numerous embedded URLs and a visual download button, indicating an attempt to trick the user into downloading malicious content. The presence of a link farm on disposable hosting further supports a malicious intent, likely for distributing malware or conducting phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://coretry.ru/uplcv?utm_term=latest+movie+download+300mb PDF link annotation
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nowepudok.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/43183892941.pdfIn PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/32938789857.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/tuvomefewibujafivil.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/62386431389.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/11273003489.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210901_EC4C3EC679E346AF.pdfIn PDF document text
    • https://kamwalibais.com/userfiles/file/wubov.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/24913381204.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/fusadanexekemu.pdfIn PDF document text
    • https://j26clean.com/upload/files/84768818289.pdfIn PDF document text
    • http://suurelepa.ee/data/file/11913914102.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16140ed588aa6e---sesevadadininibevekatev.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/52815009740.pdfIn PDF document text
    • http://kkagro.com/media/images/upload/file/31646535221.pdfIn PDF document text
    • http://thienanglass.vn/upload/files/vositimafefud.pdfIn PDF document text
    • http://productinfo.in/konadnew/userfiles/file/juxugipoxi.pdfIn PDF document text
    • https://samowar.me/userfiles/files/dokatolapisovir.pdfIn PDF document text
    • http://playonathletics.com/userfiles/file/wevuminonasovekoturugeg.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/92865016861.pdfIn PDF document text
    • http://velo.hu/UserFiles/file/68133465933.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161418ecec0d96---magopev.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_off0000dfda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F1 10852 bytes
SHA-256: 75a79478776441b9aa0b83ca6bd359e74f946ae0e2eaadbfe74e1e58e1c65875
font_02_sfnt_off0001110e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110E 17468 bytes
SHA-256: 2d807e23384ed6793b55dc0e51e7e2ff7ad22ecdcdc6385e1557c8d1fcb4719b

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