Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c0e6d324419e417…

MALICIOUS

PDF

68.1 KB Created: 2021-10-04 00:37:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 640a1f2d17ebba26605a9d3468827b4a SHA-1: 32fef296bd562cf4df468ac472279ffd9320aec1 SHA-256: 0c0e6d324419e417248778086f490ee606c205bee299545475d6fa2a8c56584d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, many pointing to potentially untrusted domains, suggesting a link farm or redirection mechanism to deliver malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://khachsansapa.vn/webroot/img/files/80274698256.pdf In PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614c51184dc5e---21135151849.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/a3810d61305b97a2578a33eaa6d480e5/4277580581.pdfIn PDF document text
    • https://webhosting4.net/media/file/76661436958.pdfIn PDF document text
    • http://zonwering-belgie.be/ckfinder/userfiles/files/kozilobawuzem.pdfIn PDF document text
    • http://446888.top/userfiles/file/49024834246.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/52038246372.pdfIn PDF document text
    • http://hnhappiness.com/d/files/87050830506.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/kixuvojuvofijobetufemexim.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210917_085432.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614434848fdd2---75027902384.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/banatodibadena.pdfIn PDF document text
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/ranoro.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/62111725080.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1631603980.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/nonifaposoxuwu.pdfIn PDF document text
    • http://steakpluspizza.us/userfiles/file/jumozeju.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/zixexozevufake.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/26091966273.pdfIn PDF document text
    • https://fabriziochessa.it/userfiles/file/likurozokepi.pdfIn PDF document text
    • http://lapempi.nl/ckfinder/userfiles/files/bojejagamewugili.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/195377612.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+disable+slow+mode+on+discordPDF 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_off0000ad83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC59A 10748 bytes
SHA-256: 306b35c7e9e6d8721d49b8114b98f9cad2d3a0362f0adf5e1ff6cd3a2ced701f
font_02_sfnt_off0000de4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4A 14740 bytes
SHA-256: f15e7da545d8804b6845660656f8e593e4a1b9b7c8233f167aa6369437076d83