Malicious PDF — malware analysis report

Static analysis result for SHA-256 915dab0fb62131e2…

MALICIOUS

PDF

84.5 KB Created: 2021-09-19 13:58:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 37171ddbee41004d08efb54db10a9d19 SHA-1: 84ddf35cab2f02da63642d8f54e3aedc055368e1 SHA-256: 915dab0fb62131e2072113a052ef1444832564d9de0839d11afe049c0129d3a7
134 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous embedded URLs that appear to be part of a link farm, suggesting an attempt to redirect users to malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://queure.ru/uplcv?utm_term=the+sims+4+download+apk PDF link annotation
    • https://desco.scp.hr/files/59207723000.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/dofixoxadogevivof.pdfIn PDF document text
    • http://aven.su/userfiles/file/61154109018.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/1640892479.pdfIn PDF document text
    • http://stickerbarcode.com/file_media/file_image/file/27548085999.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/repofojarilinesuravo.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/49231031467.pdfIn PDF document text
    • https://praktijk-fix.nl/userfiles/image/file/88038446658.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/fugeluvogiwano.pdfIn PDF document text
    • http://fgsconsulta.com.br/ckfinder/uploads/userfiles/files/32270782752.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/jugowupukaduxop.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/35489587629.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/95edcf024d3d30a0fbe429c0e598864d/bananuvidakozenugibisez.pdfIn PDF document text
    • http://boissee.fr/userfiles/file/tudovedemegimufeket.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/48544926371.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///zepiga.pdfIn PDF document text
    • http://www.centrosanmarco.eu/img/news/files/30599328432.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/59248326740.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/goronad.pdfIn PDF document text
    • http://www.prakashirrigation.com/uploads/fck/files/dezifiwenenexakirexamoz.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/xigepanevuzo.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17418170479.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161366ca8cd772---budifedene.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_off0000e31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31B 10676 bytes
SHA-256: 5d204320ccfb0694f0c30274bdb2dbd79507eb76c98135b1e88cf11f916a96ab
font_01_sfnt_off0000fb7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001138d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138D 19136 bytes
SHA-256: 229757eaaa776768e9fc79f50bb7c67150a5d69ea1baee8f1bc564dfe671c4ac