Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd4f566c27eb17da…

MALICIOUS

PDF

84.0 KB Created: 2021-09-17 19:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4dd6af1853804d25d6da354d7991742e SHA-1: 3192309f2471ffabbe3a160ed2028770c65dec0c SHA-256: fd4f566c27eb17da9010df72148c5b906e3469d802836fe59e071ca8b261fda7
142 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it functions as a link farm and a potential invoice/payment lure, suggesting it's used to direct users to malicious sites or download further payloads. The embedded JavaScript is likely responsible for initiating the malicious activity, such as downloading a second-stage payload from one of the numerous extracted URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://unitjaya.com/contents/files/rifonavolewolugiled.pdf In PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/30975993281.pdfIn PDF document text
    • http://fractinvest.com/uploads/file/tarubimenod.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/68488125477.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/66933747453.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/13539972844.pdfIn PDF document text
    • http://gabortech.com/admin/file/15804650313.pdfIn PDF document text
    • http://juentai.com/userfiles/files/86516581538.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16137909e273ec---87436525488.pdfIn PDF document text
    • http://sushibelovo.ru/files/lexuwosuwopisepomot.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/wonifimiminozevaw.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/80305580572.pdfIn PDF document text
    • https://pnvvr.ro/userfiles/file/ruwepozuxebonino.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/jitazewapokebusovugated.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/61008093359.pdfIn PDF document text
    • http://checopharma.com/upload/files/67794774281.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/44550213795.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/4896014980.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135d6a763309---68601852679.pdfIn PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/21063738516.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/49395089918.pdfIn PDF document text
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/segumokaderumigewipexami.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/likil.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/97402127084.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/metuxazobobazisev.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/zizubakizugitoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=android+sdk+helpPDF link annotation
    • 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_off0000e289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE289 18744 bytes
SHA-256: f5a580b615e83ff302c0f284831fd735b8fda08ed19c6969a533578746ce6a2a
font_01_sfnt_off00011303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11303 10304 bytes
SHA-256: f86a299ee53b0d0582d5fd522110a47a4d1aa8c2daa7bd8aa244d0c0b7ec99ae
font_02_sfnt_off00012a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1