Malicious PDF — malware analysis report

Static analysis result for SHA-256 393880094898cb52…

MALICIOUS

PDF

77.5 KB Created: 2021-09-22 14:25:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1401aea9021397427a4388a5492e7e94 SHA-1: c00bee56c12df721af6586bb15a8fed77bb3f982 SHA-256: 393880094898cb5258766306b3ff25920c31344f7f7530f764cc186126b56ca3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly support its malicious nature. The embedded JavaScript likely facilitates the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/326cc49a4d3ea5071c18e4108ae095f5/gawusiralejukakerumusa.pdf In PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/71290717828.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/duwumesufig.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/9796113605.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/23289330977.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/12651387762.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/muvewabijefixexawotexe.pdfIn PDF document text
    • http://sxnqx.org/upload/file/Fl202109201700386442.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/vufiv.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/kisokepowepewukusaguzuzu.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/35715831383.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/53659418511.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/49064047026.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/34786159138.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/tarojarinatikabesafo.pdfIn PDF document text
    • https://chambres-a-la-ferme-plouzelambre.fr/userfiles/file/24613506409.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/musokazugufe.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/5d05a0387102fe03dc608818650abd63/28094945606.pdfIn PDF document text
    • http://vietcem.vn/public/default/ckeditor/files/nupalunojuwagogeb.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/55468081112.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/bomuwujirobimidafevukema.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/98345202761.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/73666755803.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/24848694907.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/8773298100.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=super+smash+bros+nintendo+3ds+romPDF 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_off0000c7c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C1 17708 bytes
SHA-256: 961683517822b88a1e33b927095a2282b1284d7c113883914f5eaef523fb09c8
font_01_sfnt_off0000f651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF651 11100 bytes
SHA-256: 577570561c0c436dbb3f02901f304d33213b51368de29bc0510def92a165b85c
font_02_sfnt_off00010fc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1