Malicious PDF — malware analysis report

Static analysis result for SHA-256 82d6f3c151cc10ab…

MALICIOUS

PDF

71.1 KB Created: 2021-09-09 11:53:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 09c1d4349b6f27c25e2b0cafa77c0d97 SHA-1: ae4285de3b16edde0842ba5c4e5f554db2180ba1 SHA-256: 82d6f3c151cc10abb32c1a22560c22451d830ec01eca3c228c1136a8282a2d76
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://icloudcleaners.com/uploads/account/autoresponderfiles/815326468.pdf In PDF document text
    • https://ferado.vn/userfiles/file/90771024446.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/2191472662.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/rizapagerepukuwazepase.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/54289984922.pdfIn PDF document text
    • https://kingdom.vn/userfiles/file/gogopugapezosajulak.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/zumufe.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bikekopegojewedav.pdfIn PDF document text
    • https://advik.net/userfiles/file/33524080790.pdfIn PDF document text
    • http://www.vnos.vn/app/webroot/uploads/files/79177388923.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/78472355653.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161361e450323e---96150787275.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/10759637784.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mupugerubetevupewiw.pdfIn PDF document text
    • http://petswithlove.com/cvsprojects/SSK/Source/2.0.0/images/files/40848717356.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/migisafifut.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/tarobatujewimuneral.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/nemasamujata.pdfPDF link annotation
    • https://stratasphere.online/userfiles/file/nebazevukoguvi.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/59019400949.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132cc404d6d1---32758038995.pdfIn PDF document text
    • http://asesoriazabalburu.org/azaba/files/file/pevunenupuzukolewij.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/zaxupakuvilup.pdfIn PDF document text
    • https://basisnomor.com/contents/files/12221649698.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=utorrent+android+file+locationPDF 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_off0000b703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB703 10308 bytes
SHA-256: d26d5edf013d5fd45e731c0a3aae058333efb6397960eff1d834bc5f416e9042
font_01_sfnt_off0000ce50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE50 15856 bytes
SHA-256: de0c1241a871ab9a33dacec756144676fa35acf5b28f297d470520fbbf21757e
font_02_sfnt_off0000f722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF722 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1