Malicious PDF — malware analysis report

Static analysis result for SHA-256 da86d333a829325d…

MALICIOUS

PDF

87.0 KB Created: 2021-09-09 04:08:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ff3dda39b01c2ec137ad90008719593f SHA-1: ed4b582b017a2cc002c454a66aeda674fc820894 SHA-256: da86d333a829325dcac0144dac7567540e2e0901821293d9af6c6670c6a11e24
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, with specific heuristics indicating it is a link farm on disposable hosting. The PDF contains numerous external URLs, suggesting its primary purpose is to redirect users to potentially malicious websites. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=3d+icon+packs+for+android PDF link annotation
    • http://nakajima-ya.com/upload/save_image/files/2472301913.pdfIn PDF document text
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/falatiruregusu.pdfIn PDF document text
    • http://pinxedien.net/upload/files/sosidarumesidazizebiwanos.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/53542544615.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/vuromawupo.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202108311704271762.pdfIn PDF document text
    • https://eventaipei.com/upload/files/44187481377.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/vesubefef.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/tugumuwubimeme.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/76731198115.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/97643512560.pdfIn PDF document text
    • http://an-professional.ru/img/files/file/lufuxuvokozadazot.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/mesev.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b463238de---52132894681.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/widupomulipepojite.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/tarilimofugon.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/rakezujemiwi.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/pifodisiwaf.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/3389151076.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/0a928cda2cea4194ee198802ce673480/binenaniviw.pdfIn PDF document text
    • https://mfdesign.hu/files/file/kesuresutorogukewe.pdfIn PDF document text
    • http://alptw.com/images/files/pitosinusovivojizijezawix.pdfIn PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/wikesewubunadefa.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/vedarenidatofilamixuva.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_off0000ef9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9B 10504 bytes
SHA-256: a25a7f8d328c669fc06cdb4253a11f2fbe7e13645599683b17dd7e6072202679
font_01_sfnt_off0001078e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078E 17944 bytes
SHA-256: eb7527a293404b1949e2e957e00b5be3d0b9ec58fae2b1b2d66566e352e90b85
font_02_sfnt_off0001367a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1367A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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