Malicious PDF — malware analysis report

Static analysis result for SHA-256 6925a1831a56edc3…

MALICIOUS

PDF

82.0 KB Created: 2021-09-11 15:27:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: b697a62b1a08ff48def3c9cbe3fe4293 SHA-1: 550751127291089642438ddb0ad27af088e95895 SHA-256: 6925a1831a56edc355c532dec16e28400ec04a39ea111e3e229f3a7ade9609f7
134 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 0.9955

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.
  • 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://9262895.ru/ckfinder/userfiles/files/13238310848.pdf In PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/nitogudalositozisanajelo.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/fuvemugolosorabomagepup.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/biwalogigurumijine.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/25705590778.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109060605026693.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/6244430457.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/sijixujirujezidop.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/23046450026.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/movawunozolavuludutigo.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/43365244041.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/93690558333.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210907011011.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/pinarenanibasawogozuf.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/72273215133.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/ruwekeletowokimipeba.pdfIn PDF document text
    • http://air-ned.com/uploads/files/zokem.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/javutotibofe.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/96499961719.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613548953269f---todabuxijelekamov.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210905_524D82EE5C6FF168.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/gukuzuradenuri.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/runerixipukexotewajadorew.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/dokutagejuzapiba.pdfIn PDF document text
    • https://forums.androidcIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+unblock+sms+on+androidPDF 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_off0000d9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F8 18428 bytes
SHA-256: db76a4befce2ef4bb47bc97684da5d03ac5170cb607f0e289c45aa2516a5b624
font_01_sfnt_off0001099f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099F 10808 bytes
SHA-256: b8135f21df19e9d0cf0062baf9cf2eefa059858f2446c1846513ffc3b91300c4
font_02_sfnt_off00012284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12284 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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