Malicious PDF — malware analysis report

Static analysis result for SHA-256 828d427cccae60bd…

MALICIOUS

PDF

82.7 KB Created: 2021-09-11 10:44:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dd3f60dc976bbdfcd52ac6590dac8194 SHA-1: 7a4820763bbe63488c33ecade03baaf055c577b1 SHA-256: 828d427cccae60bd249ceb971e772c710061ed99ea09cc5752d8dceee64356ca
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URIs, many pointing to unknown or potentially malicious domains, suggests a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16135621965902---bijonadasavaxolifi.pdf In PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/46277447888.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/tubiporuwi.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/67878899261.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/88845839947.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/20237760554.pdfIn PDF document text
    • http://poledance-chrudim.cz/files/file/67742162238.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/86620492746.pdfIn PDF document text
    • https://lasanisports.com/files/51516214467.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/batezes.pdfIn PDF document text
    • https://bagstyle.uz/images/file/92677247196.pdfIn PDF document text
    • http://cascad-trans.ru/files/40280418895.pdfIn PDF document text
    • http://stfurnimart.com/file_media/file_image/file/nujoguma.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/45620019015.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/fumewejupowiwawox.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/f54529b11f0ca6f1be89000d9e98fb06/1487377498.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/gabowavixubizogejot.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/segaf.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85572074319.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/19301201665.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/13789344330.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/mefikipekanalegiz.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/54144736940.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+turn+old+phone+into+webcamPDF 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_off0000ddec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEC 17864 bytes
SHA-256: 94df4821e4f729f6efa926d457428306d170c49509b75baf877e237330d617a5
font_01_sfnt_off00010c62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12479 10928 bytes
SHA-256: 792033516ad5b238ffbdf3eb5a71da4591e80b1685a4fef75e5dbf10f0c58eba