Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dfc6d4ba544343c…

MALICIOUS

PDF

70.1 KB Created: 2021-09-25 01:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fdcd9252830eb9b460ab16c016c7e0b8 SHA-1: cbbca2c0869c9e3712aaf21c3aff2c07fa5a65d4 SHA-256: 0dfc6d4ba544343c6084e798f624e546b70893678eefa17209521817681e0071
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links. The embedded JavaScript is likely used to obfuscate the redirection or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://ringid.vn/ckfinder/userfiles/files/77895298096.pdf In PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/62036662719.pdfIn PDF document text
    • http://nhanvietgroup.com/demo/xay-dung-tnx/upload/files/66727835922.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210921031728.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/79437429570.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/43999151757.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/bc25b7ffd139c786306d9ed6acd7697e/moxijen.pdfIn PDF document text
    • https://mauspro.net/upload/files/2696697025.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/narotawosuzesavofinelipob.pdfIn PDF document text
    • http://home-plast.ru/foto/files/39372984417.pdfIn PDF document text
    • http://ty-int.com/files/files/90782666570.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/xetonibegof.pdfIn PDF document text
    • http://byecook.com/ckupload/files/38381278901.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/93540464945.pdfIn PDF document text
    • http://thamcohoaian.com/webroot/img/files/54224474303.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/jegasuzaxadev.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/fajukufabijoxozov.pdfIn PDF document text
    • http://sushi-belovo.ru/files/36448645460.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/55082739025.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16135961863ca5---tumevadafutusa.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/zerew.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/91569639511.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/wemosisuxiditokanokolukex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=coc+hack+for+androidPDF 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_off0000b2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D3 10252 bytes
SHA-256: a32e0b342553d7f3a19a16c3268d472cc44d4bb4903f4afc7b917f9392262fe5
font_01_sfnt_off0000c9c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C3 16160 bytes
SHA-256: 52e80b930c3e4c51c9c90d4aab72584e9129df7518e1e9f9b007c8e9ceccf072
font_02_sfnt_off0000f2bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1