Malicious PDF — malware analysis report

Static analysis result for SHA-256 b69a0af447a2bf27…

MALICIOUS

PDF

79.7 KB Created: 2021-10-11 18:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f0b32ce8c294d16da738bf7bf321b61f SHA-1: 4f61ad63a8a257077bba4def3a0b2fafaccb1e0d SHA-256: b69a0af447a2bf27e56aa50f547563a3c8047914d84daa26e5dffad5bca3307b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host a large number of links on disposable domains, suggesting a link farm or phishing infrastructure. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://3m18.com/images/editor/files/sinasaduxijunabime.pdf In PDF document text
    • https://nevisnews.com/userfiles/ruvuxaleru.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/vuxukagutevuwufibiw.pdfIn PDF document text
    • http://hcm-invoice.vn/hinhanh_fckeditor/file/nimerosaweki.pdfIn PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/kaderomodupigobudu.pdfIn PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/86739871620.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wobaxojugunata.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/lajituwijefu.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/7ecf307796d8c162e3471fde4a294496/munewujubexexofudeweso.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/97203817756.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/midoxerafelivetuva.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/gakarinujesowavaxusize.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/dalopetitikibega.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/85025628454.pdfIn PDF document text
    • http://kgmda.com/upload/files/10554792264.pdfIn PDF document text
    • http://citty.org/images/uploads/file/gunikitupomunix.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/d61479b1f65b03b940f1f4ecd406be27/jegigajanomirejujipupixud.pdfIn PDF document text
    • https://susta.vn/userfiles/file/sefojeta.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/51339814265.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/EqozwcbAC44/uplcv?utm_term=two+metals+less+dense+than+waterPDF 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_off0000d2ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB06 10468 bytes
SHA-256: f69fb6ca6f992fb0b5db6866a5430ab623579e8aad905e3d9d32d605ba1efea5
font_02_sfnt_off000102aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AA 18176 bytes
SHA-256: 13465e6f1f182e4233b55bada3b77a9377cc1911b45231d13e3f0c39333a9269

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