Malicious PDF — malware analysis report

Static analysis result for SHA-256 efdb0e3f7e0e4ba7…

MALICIOUS

PDF

85.0 KB Created: 2021-09-20 20:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e4f05931d3d84e91717efefc5290967c SHA-1: 4440ca2a79283b4aa2b2f511a5c53600e3bd80af SHA-256: efdb0e3f7e0e4ba7b2eeb1b165d4aa69561932c27ffac94cad9ca92382ef1ff3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to PDF files on various domains, suggesting a link farm or redirection mechanism. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically highlights the use of disposable hosting and UTM parameters, common in phishing campaigns. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest it's used as a lure to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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.
  • 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://trufeel.com/ckeditor/ckfinder/uploadfile/files/wukikugitugetunamovopa.pdf
    • http://riph.pl/userfiles/file/72756573799.pdf
    • https://iasvn.org/Images_upload/files/rewasadenut.pdf
    • http://sushibelovo.ru/files/gatevi.pdf
    • https://datatalk.ilvzhou.com/upload/files/2021/09/202109111800517370.pdf
    • http://patronusalapitvany.hu/public_html/upload/ketasevovuxazavezoge.pdf
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/kanafi.pdf
    • https://10fci.org/userfiles/file/31558960401.pdf
    • http://petukmahaaaraj.com/userfiles/file/fofedejapetotetusaji.pdf
    • https://pieseautocomenzi.ro/userfiles/file/kakizanolujaf.pdf
    • http://yearbookplus.com/uploads/ckfinder/files/guxatabezagolel.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/a402b467ef91b93259d54c0e9d46045a/nuxap.pdf
    • http://danguykhoidoanhnghiephp.vn/Upload/files/kuzejobonaguwalofe.pdf
    • https://pemaboutiquehotel.com/assets/userfiles/files/vadijugegawikixupozepo.pdf
    • http://eternaseguros.net/files/files/5667367046.pdf
    • http://aow.infogestnet.it/ckfinder/userfiles/files/dazobo.pdf
    • http://nagymester.com/userfiles/file/pafinonedunodevanoxe.pdf
    • http://crescentcarpets.com/userfiles/file/xotosemogejegiz.pdf
    • http://hoteldarim.ir/basefile/hoteldarimir/files/xavaka.pdf
    • https://vwb.mrv-educationservices.com/content_file/files/dumusupiputolosowuxapodos.pdf
    • http://analhospital.net/file/files/6212704542.pdf
    • https://hoangvan.vn/wp-content/uploads/files/39763530045.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac980a3fe6---kadinesofijezowuxegal.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=dual+boot+windows+7+and+ubuntu
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea07.bin
169da09cab374edcd38b6a6bf07ae0e690ed6adac740760bdcd2e136866cc735		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA07 10384 bytes
font_01_sfnt_off000101b8.bin
e8732b97ee74b4be73fd8ba452134d0a257b768da89d348ac698a1b09c2d0b53		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101B8 17148 bytes
font_02_sfnt_off00012e38.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E38 16792 bytes

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