Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcd858b49071da5c…

MALICIOUS

PDF

90.4 KB Created: 2021-09-17 20:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 64e9a34ba3ab14b5a9e278704c27a809 SHA-1: d9a6df44264c3126b2e388537b8f0704ab4120fa SHA-256: fcd858b49071da5c2856d37877436fc10a8b6d08d188e22042ee3d8cf87941c8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many hosted on disposable domains, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to redirect users to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://cructi.ru/uplcv?utm_term=best+app+for+loyalty+cards+android PDF link annotation
    • https://airxps.com/userfiles/files/nalise.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/44501300217.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/1552907527.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/14956031415.pdfIn PDF document text
    • http://sns.hu/_user/file/93596374053.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/47682639944.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/selirufumiramujixalexal.pdfIn PDF document text
    • http://epmachine.ru/d/files/sebitazasixa.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/10578164663.pdfIn PDF document text
    • https://orrizon.ru/images/file/21433645509.pdfIn PDF document text
    • https://e-midas.ro/files/file/loniduja.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/47153723973.pdfIn PDF document text
    • http://gzcaifeilai.com/ckfinder/userfiles/files/202109031431347416.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/80049499173.pdfIn PDF document text
    • https://jetaime-shop.com/files/wafejinu.pdfIn PDF document text
    • http://cuathepvangohaiduong.com/images/ckeditor/files/gexewutinulix.pdfIn PDF document text
    • http://devison-matras.ru/upload/file/8769031363.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/98737959152.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca9a85a4ed---bukoderegomipiwiwiwarodew.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/vorefikenaxakuja.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/tetezij.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/bupizivip.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/rogudemuxepilenu.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/94050806518.pdfIn PDF document text
    • http://geose.ru/userfiles/file/87942656388.pdfIn PDF document text
    • 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_off0000fde2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F4 17348 bytes
SHA-256: d4f5c73f2b68a51721ce9d278ceecd275b19959cd25dd4ca1845204275002f5e
font_02_sfnt_off0001428d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1428D 10780 bytes
SHA-256: dfaa3b69ba5f6c2090cc28274b93279b54001613b64d1eab4ca455b599685848

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