Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6c6e15f71b2cb7c…

MALICIOUS

PDF

76.5 KB Created: 2021-10-03 21:07:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 43bd8cd042005205595028188ca6f037 SHA-1: 17a907f1c3fa95e90b238c1437b6edc677c957d2 SHA-256: c6c6e15f71b2cb7cc0e2af075bd2d88b5ea930c61d170b3a6078c5c2ce48ee25
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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 https://coretry.ru/uplcv?utm_term=paper+airplane+instructions+pdf
    • https://lazdynumokykla.lt/userfiles/file/bebizonakiwekofodajo.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401d93c3f89---4630768190.pdf
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/11543620005.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156aec7ec776---27646167745.pdf
    • https://jager-ig.tw/up_photo/file/juwiguvudaba.pdf
    • https://northcoteplaza.com/userfiles/file/ritixosorefok.pdf
    • http://cnsgawefgl.netsociality.com/upload/files/75888955323.pdf
    • http://scales-center.com/shop/fck_file/file/wulezavifur.pdf
    • http://tokyoto.pl/UserFiles/file/xepejirivivifijolore.pdf
    • http://plusk-car.com/js/upload/files/padatamubokoxax.pdf
    • http://hoteldanang.com/uploads/images/files/49688114040.pdf
    • https://gestcargo.com/uploadfiles/file/89001080026.pdf
    • http://spielundlicht.de/content_provider/documents/files/7282531438.pdf
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/fogujugomojarometedenevix.pdf
    • http://squash-fitness.cz/userfiles/file/pabudokobud.pdf
    • https://vos-web.nl/userfiles/file/33471636516.pdf
    • http://ranchobg.com/img/file/fibevuveroxozaresifok.pdf
    • http://yuha.be/_files/file/93110847234.pdf
    • https://ecoledesgourmets.com/userfiles/file/wapekedetumonuludexa.pdf
    • http://soles2walk.com/data/file/23758309020.pdf
    • https://siam-royal-view.ru/data/files/ladomegu.pdf
    • http://fusen-es.info/yamituki-n/uploads/files/81115709376.pdf
    • https://rzfmuhasebe.com/userfiles/file/kopasegixug.pdf
    • http://backupcenters.com/userfiles/file/12002947722.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c151.bin
afa2b6ef780b7266a957f32572c77ddee4bb0eccdd85eefcccc65192ad289c4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC151 10712 bytes
font_01_sfnt_off0000da00.bin
96746f8e34c7eb3869936c0328238de3a57cf615cca498ffe053ecdd581565d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA00 19188 bytes
font_02_sfnt_off00010bd6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD6 16792 bytes

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