Malicious PDF — malware analysis report

Static analysis result for SHA-256 0332f4560972754f…

MALICIOUS

PDF

83.6 KB Created: 2021-09-22 17:23:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5abe3b1860ec3212ebfaa5dbc29efeec SHA-1: 569779cd5ff5400fd645576b846e1eb261b10f75 SHA-256: 0332f4560972754fe104d6061cd641b9e13202ec9759264bec5ad959d09b93a5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. One URL, http://aexpress.lv/index/images/up/file/8085393408.pdf, is flagged as unknown reputation, suggesting it could lead to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://aexpress.lv/index/images/up/file/8085393408.pdf In PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/voziperatifelana.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/21091119065199498597dmkg.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/bowutupenitodobapominije.pdfIn PDF document text
    • http://hocomesun.com/upload/27862324639.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/22307792498.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/46404746062.pdfIn PDF document text
    • http://www.fdconsult.qa/public/uploads/cms_files/70365337742.pdfIn PDF document text
    • http://ilkemymm.com/image/files/75902145999.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/ravanijefalinuwugebej.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/202194734347494.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xivotujizetowebazixuru.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/1ef6f5f0f3395ec09b49beb37eb0a302/ludeduzozune.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/biwudufa.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/lemijewekumixixusuwelep.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/82496394227.pdfIn PDF document text
    • https://cingenito.ca/upload/editor/file/64779899671.pdfIn PDF document text
    • http://magdrywall.com/project-new/christianbook/upload_images/file/saxetu.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161350952efac4---tuparipap.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/61518992131.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/79555092218.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/xizip.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/tomorotisu.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/bawojakodolube.pdfIn PDF document text
    • http://wawa757.com/uploads/files/nimosik.pdfIn PDF document text
    • http://sportsclinicwest.ie/media/contents/file/47543070698.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=c+programming+and+data+structures+pdfPDF 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_off0000ddd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD7 18836 bytes
SHA-256: a84235d0e56aba514e269f8786f2e343e7145a1f343b9a5af1e5f40793c0a076
font_01_sfnt_off00010f54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001276b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276B 11048 bytes
SHA-256: 4a6c27680d67983a8eb6d3da71f36016d06fdda301250949d8fef4b628563436