Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdce7d1ff37b5191…

MALICIOUS

PDF

82.2 KB Created: 2021-09-12 22:12:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 164774c8a73705a5676d9b22344dd474 SHA-1: 4ca66604e7e75f9810db37d3e32fea527d650e22 SHA-256: fdce7d1ff37b5191ddaf609526bc626f81cc1fb9c327c8bd346d89bf46349e77
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document is part of a link farm, and numerous external URLs are present, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://louisamerino.com/userfiles/file/32199639654.pdf In PDF document text
    • http://yokohama-model.com/userfiles/files/fonagubuvokotufakanaw.pdfIn PDF document text
    • https://atavio.ru/files/file/41089096390.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/naburo.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/denizulenuladakimu.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/tezefaderipij.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/lunuforodupajomifutomew.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/88312579254.pdfIn PDF document text
    • https://12shio3.com/contents/files/rozabejuzano.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/93290779093.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/kaxemigesub.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/41241861616.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/qo5hetolf0ndhf5ph0u9jhvsjo/18016449088.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/32881091373.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/37457331357.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/49064936498.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/25619170478.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210910000044618.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/xadirazokomut.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210907_182608.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/a16d0d947b87842b0da66cc6c09250b5/bibok.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/jerexonivorusiwugaguwudo.pdfIn PDF document text
    • http://lawyergz.net/uploadfile/files/vamegateleve.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/febusigurukizodus.pdfIn PDF document text
    • http://julianina.dk/upload/file/16175766240.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18552167934.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/desuzonunejanazifozop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=hack+ig+account+freePDF 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_off0000d8a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B2 19408 bytes
SHA-256: b9707685aa105ca913b66e3536f67b6c328c4061aec912f06bee88cbd1b4ef87
font_02_sfnt_off00012331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12331 10480 bytes
SHA-256: 816c1f98ad63f56d6b841505cf5f8f7bd587891e6e86e1ae60e8f2a5f04e80a7