Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea595973423b6516…

MALICIOUS

PDF

85.5 KB Created: 2021-09-08 18:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3aedf7f8c1b01a0a01fe1838b34a6940 SHA-1: 50d365390b1f109e977ca5c03ecc730be05b865b SHA-256: ea595973423b6516e026e7aa04abc779aaa91862296593a60869078cc034d8b2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to T1059.007, and the overall delivery mechanism is consistent with T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://synerhu.ru/uplcv?utm_term=pulse+code+modulation+questions+and+answers+pdf PDF link annotation
    • http://highdesertrent.com/newsite/images/uploads/file/dakobakonutodinow.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/nuvatemafedupekesib.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132682cc441d---lewegemasu.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/sipoz.pdfIn PDF document text
    • https://questyme.com/userfiles/file/xivalusun.pdfIn PDF document text
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/wuriridagaje.pdfIn PDF document text
    • http://precisao.net/files/files/78479874571.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/fixumufogerumipidike.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/5d555fa1ed56c31632d816c13ccf203e/bosexowijonu.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/77137378436.pdfIn PDF document text
    • https://salwangurugram.com/files/xuputifesape.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/mukovi.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/bajavu.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/66905487027.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/zazumakemapevonefituko.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/puzunanomemuxiwulu.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/47017384637.pdfIn PDF document text
    • http://aucontecnologia.com/userfiles/files/bavofibamimevividowo.pdfIn PDF document text
    • http://zzquansu.cn/d/files/tezuvinaxinerupovuz.pdfIn PDF document text
    • http://giaydantuongphongngudep.com/images/news/file/5178056463.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/tojawopuvepuwakasivunewu.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/bepowibisiximepuzowutifaj.pdfIn PDF document text
    • http://hangquangauto.com/files/39582864640.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/11058526283.pdfIn PDF document text
    • http://samtekelektrik.com/files/89868187606.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_off0000e489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE489 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA0 11116 bytes
SHA-256: 70e16fcadd7b2e2b5644c62572d58f7a1b911af855c0c8dec52f3acb205f9c31
font_02_sfnt_off00011663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11663 19172 bytes
SHA-256: 97c4976e5952e828f836aab2a03ad11593c62f0787cb61bf8c63cd3a7a6ed8b7