Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcf8df47007f5c8c…

MALICIOUS

PDF

77.6 KB Created: 2021-09-21 10:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 89eed5465679dc392afa078deb761764 SHA-1: 7d1fde5f5eac39c2bf052ee218dd06b9b4606b78 SHA-256: dcf8df47007f5c8c2cc3e34fd5df4ebbb0d60185eee47fc570da2e270fbda068
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains an embedded JavaScript stream and numerous external URIs, suggesting it's designed to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports that the document is a link farm hosted on disposable domains, commonly used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://cructi.ru/uplcv?utm_term=delete+duplicate+text+messages+android PDF link annotation
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/20455441312.pdfIn PDF document text
    • http://idcla.net/upload/files/41093605016.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/lukokojem.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/gapozumujofetirutati.pdfIn PDF document text
    • http://jodhpurheritagewalk.com/images/file/tokixatexaza.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/8221b9c5e0dbd1ffc7b2c1b8c9c9d074/97903746446.pdfIn PDF document text
    • http://dga.gr/ILC/img/file/tiranupesurovudarofo.pdfIn PDF document text
    • http://w-mill.jp/images/file/buzodopimibimanirukavowi.pdfIn PDF document text
    • http://bandbaajabarat.com/ci/userfiles/files/raregojubot.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/zinovu.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/11127386116.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/84874241533.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/xujowasasudijafotakuda.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/dinasizivedopixugagawi.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2ec10f367---bujisipuwasoge.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/mefaxafomufalagosupagape.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/96816412324.pdfIn PDF document text
    • http://exteractif.fr/pictures/2/bifiw.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/sajekakonisumanik.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/xuveveze.pdfIn PDF document text
    • https://bfull.ru/uploads/files/14193448450.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/36872475047.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_off0000c917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC917 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e12e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12E 11060 bytes
SHA-256: 1594223e94b3de4801eb73148549592021fbbaa92756525299addb9a0b5040fe
font_02_sfnt_off0000fab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB7 17640 bytes
SHA-256: cbe53a307a60cd41a15bec10271abd330a7b7668285621fe0b392b1912a8989a

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