Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f65e2fdaea4a78b…

MALICIOUS

PDF

80.1 KB Created: 2021-09-10 22:43:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ceb07834d1c00988b8d2810043fcea0d SHA-1: a94ee6bb6cd9f9383f4ce4fc4cbeade6e6d6e7f2 SHA-256: 2f65e2fdaea4a78b469120584788129fb16d47bb430611c03d35d9842ba91063
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 embedded URLs, many of which point to potentially disposable domains, suggesting a link farm or phishing lure. The PDF structure and the presence of external URIs are indicative of an attempt to redirect the user to malicious content, likely exploiting a PDF vulnerability or using social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://industrialsupplies.pk/userfiles/files/95705695417.pdf In PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/lujobebujojavujif.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/boxobasitibukiba.pdfIn PDF document text
    • http://gazomotor.com/allinone/file/naluxevedil.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/tipegejorepodudemo.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/37483472506.pdfIn PDF document text
    • http://thevale.us/userimages/7154481373.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/tofuvolepawupoxenogu.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/53597323633.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/ximupexefig.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/simodob.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/nulewe.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/2392173504.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613759f3b060a---gigosipapenajizuweloripu.pdfIn PDF document text
    • http://runhouchem.com/upload/files/sagofobusalesud.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16132743a944b3---68919100079.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/rodekitirejunogozupupi.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/2021951947158215.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/34147571982.pdfIn PDF document text
    • https://bachson.net/upload/file/tisaki.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/luwitezomopugifojatudu.pdfIn PDF document text
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/vuvitejafasiwebogibuxawam.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/sapagabopepemusuxiw.pdfIn PDF document text
    • https://groupunsur2.com/contents/files/78141007814.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=today+vijay+tv+shows+listPDF 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_off0000d514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD514 10368 bytes
SHA-256: 589299c3d187189681eda08eff80ea07982684b903b673cec074c374cebdb306
font_01_sfnt_off0000eca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B7 17740 bytes
SHA-256: 1116e11b400c0ebb2b493e467034353bc47b000987827208401d546e472bf701