Malicious PDF — malware analysis report

Static analysis result for SHA-256 dee1e6ad0927d37a…

MALICIOUS

PDF

82.7 KB Created: 2021-09-16 01:59:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 97d8f371047ede39a8ef0319ad7ccf38 SHA-1: db9b242aaadff1027c1c8770886eaeff3118aacf SHA-256: dee1e6ad0927d37a2378d5009c64bf9f982b18a19ad35cdc5ed41f297714a201
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are structured as link farms on disposable hosting, suggesting a phishing or malware distribution campaign. The PDF structure and embedded URLs point towards exploitation for client execution, likely initiated via a spearphishing attachment.

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://wastran.ru/uplcv?utm_term=bubble+charms+2 PDF link annotation
    • http://narnivet.com/userfiles/files/89457882732.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/42940115143.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/girewetozubake.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/78404134447.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/zifulogudix.pdfIn PDF document text
    • https://raljob.com/userfiles/file/59014097487.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/42215132605.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/74839750375.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/69021005352.pdfIn PDF document text
    • https://buonoantonio.it/userfiles/file/saberojuvugesovefow.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/24467081590.pdfIn PDF document text
    • https://cooperadora.grupocreartel.com/documentos/archivos/kaveludewonakazewusewaze.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/4862770726.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/39792305903.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/75591402445.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/fefosonewiwetumu.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/634c0f7be0cdf5b6bdc771656debe2e7/zezemoxomanimipinu.pdfIn PDF document text
    • http://cauthangdep24h.com/upload/files/92124544133.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1afa8adcc---bokakenomeximopaju.pdfIn PDF document text
    • https://wecareprogram.org/images/file/tigat.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/70664765892.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/38290635726.pdfIn PDF document text
    • https://viscom.bg/uploads/wysiwyg/files/66306580324.pdfIn PDF document text
    • https://tworaise.com/userfiles/file/turelu.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/68737463283.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_off0000dc3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3E 18564 bytes
SHA-256: 4f8d6f251f76872bdbb2fb13f635db316d6b16094acbaf341bfcca5b4ced1af3
font_01_sfnt_off00010ceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEB 10496 bytes
SHA-256: 69842f416334b76aa04bc61980eb3d39b98b05ac06d5e42ebad1f57df0636d03
font_02_sfnt_off000124e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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