Malicious PDF — malware analysis report

Static analysis result for SHA-256 da4b4dea51c6198e…

MALICIOUS

PDF

81.1 KB Created: 2021-09-13 15:51:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c656006f6baf0b85528f8b222f5354f0 SHA-1: d3ed3b6c517ed795d8835568f6df80b89258a850 SHA-256: da4b4dea51c6198eb22bab6540e725bd07bfacda47cecc71ccddb58f3bcd00c2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://philabc.ru/uplcv?utm_term=aplikasi+pembuat+video+dari+foto+terbaik+untuk+android PDF link annotation
    • http://oldmotorsclub.com/files/file/xufegoxipunaf.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/vulilavivinigobuxujurire.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109111901475620.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/kezaroturapalogidenarip.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/rotomumuronoporuxu.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/26460877250.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/rogoxifodilogawaben.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16131ca94d21d4---57030388688.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/tuxemefamituruluwefobex.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/29970440018.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/83878861428.pdfIn PDF document text
    • http://autofox.lt/ckfinder/userfiles/files/66936309528.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210910095736.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/dalapaduvilosobaviwa.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210906_010452.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/zobex.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613931c71428c---9591580061.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/87822622067.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/lonijirefoba.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/zugurupapovezukusagut.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/28131860439.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/todakipaxovesazubar.pdfIn PDF document text
    • http://pedraferro.com/files/files/gikimebovaveketinigaj.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_off0000d937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD937 16212 bytes
SHA-256: c9b0076f7b5d004c9ca873ee2890d5e18c1f6b25479b760c4814b9bc6195fccc
font_01_sfnt_off00010356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10356 11040 bytes
SHA-256: 5c974ad03e5c33888d6c5259b48be900f8f9bf002f2c923987241a4369c8efe3
font_02_sfnt_off00011cd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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