Malicious PDF — malware analysis report

Static analysis result for SHA-256 41ece0f0401b4199…

MALICIOUS

PDF

115.4 KB Created: 2021-09-18 00:13:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c0937e2037012b231ab894ce3db83b01 SHA-1: 7065bdab91b2a5ce2ca250da6dae30e8a3f1a2fd SHA-256: 41ece0f0401b4199c6b306e489b907c30c04ee2bf0e68e8763230cf16f4207ea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to link farms hosted on disposable domains, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or redirecting users to malicious content. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://ezsprinting.com/userfiles/file/xifubagugot.pdf In PDF document text
    • http://samafb.org/uploadfilefiles/91245089782.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/87327212506.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/vebusuvefibi.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/kavugofikojozexoveberisup.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/20884175562.pdfIn PDF document text
    • https://fundacjanadzieja.com/images/wyswig_images/file/76343469015.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/51109019053.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/vomigote.pdfIn PDF document text
    • http://tieuhocsongphuong.hoaiduc.edu.vn/ckfinder/userfiles/files/42673382866.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/4929006571.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/256d0ec5d123f68d66a9f9cbbed58ca7/401675253.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/14835264764.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/maworibelu.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/b5fdbd3f398b51d17269376e7be417bf/retit.pdfIn PDF document text
    • http://nayyaralidada.com/alpha/ckfinder/userfiles/files/salunimojiwefigagomemota.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/dutitene.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/fobexuruxepidobedozoko.pdfIn PDF document text
    • http://naso10.com/userData/board/file/mesabozalofizaxona.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/55712523795.pdfIn PDF document text
    • http://dsagco.com/Upload/file/nuxasikifelix.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/dakiw.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/bezuwaju.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/zotitoteg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=history+line+1914+18+f%C3%BCr+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_off00015d4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17561 11152 bytes
SHA-256: 82b833d230850e2c06461d5243b814309d5b4c88e6304d0e447ed34846cc5556
font_02_sfnt_off00018f8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F8F 18212 bytes
SHA-256: 7c488e721ed82d81a91d5bb48b7810dfb609fe909459e66ce1468a7200a9758d