Malicious PDF — malware analysis report

Static analysis result for SHA-256 b04c4ab73c19cd2b…

MALICIOUS

PDF

89.3 KB Created: 2021-09-11 16:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 86fdd27c90c9f7d40a329799890d4cda SHA-1: 6a620696d6ec46d4dabb3147fe6e1c048018487c SHA-256: b04c4ab73c19cd2b5f42fb77009d55ae46d323da376294658854d5cee41d4012
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a heuristic firing indicates it is part of a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The numerous embedded URLs point to external sites, likely to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent.

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=hero+tower+wars PDF link annotation
    • http://prtourusa.com/FileData/ckfinder/files/20210907_8B8E07D5D8008B71.pdfIn PDF document text
    • https://panoramamall.bg/ckeditor/ckfinder/userfiles/files/51852076890.pdfIn PDF document text
    • http://mibenjamin.com/userfiles/file/wozerero.pdfIn PDF document text
    • https://gilboamedia.com/userfiles/file/zarotum.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/texoxopijepo.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/87919931352.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/89716285082.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/nosapogidojevoparevi.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/tabaj.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/70306807595.pdfIn PDF document text
    • http://ruihuitax.com/files/file/gosoxosawininifiboxid.pdfIn PDF document text
    • https://grancom.by/upload/docs/2507439090.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/vakuwebujile.pdfIn PDF document text
    • http://dieutrimun.myphamkangnam.vn/webroot/img/files/bapovul.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/vipow.pdfIn PDF document text
    • https://baglab.pl/galeria/file/zinalunoraju.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c73d2d44f5---56340498408.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/16604192263.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/juwuwufupopozakuragef.pdfIn PDF document text
    • http://artc-polymers.com/upload/images/files/64488395316.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210902_D715ED5C13E7A24A.pdfIn PDF document text
    • http://master-stroi76.ru/userfiles/file/84647472415.pdfIn PDF document text
    • http://aminotp.com/upload/files/50272220017.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_off0000fb9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9E 17744 bytes
SHA-256: 3a76333219d1eca62a7e9404772aac74812c531689e94de910a3a7b6ba24db60
font_01_sfnt_off000129be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129BE 9936 bytes
SHA-256: ab67b7666b09e2762444b056a85c59fc86da482b0b796792599450c8c79b8217
font_02_sfnt_off00013fe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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