Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3e11811c5e03903…

MALICIOUS

PDF

81.6 KB Created: 2021-09-16 04:59:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a7f941bf224957149df4a877776d21ed SHA-1: d135dc976f27810b826faba4780a113263417662 SHA-256: e3e11811c5e039034d6b678533e501908454ba23c99b1f17c79f6bc41e7cd611
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting. The presence of embedded JavaScript suggests it is used to facilitate redirection or exploit vulnerabilities, likely leading to further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16130bd493b669---80456556429.pdf In PDF document text
    • http://drentmedischadvies.nl/uploads/files/33777155536.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/pejokijav.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/pidemizot.pdfIn PDF document text
    • https://pierrelemagicien.com/userfiles/file/54931545655.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1630573222311428173.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/56274995677.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/vogizulegalosuvuta.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/9351615652.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/85960989318.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133be40d87dc---bojadesufowujaniti.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/45232465222.pdfIn PDF document text
    • http://erictex.com/ufiles/files/63864352049.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/waxew.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/litarapuresuxewejedil.pdfIn PDF document text
    • http://liyangah.com/Upload/file/gatuwi.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/noxezelutewefozisivur.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_15_14_45_49_5662.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/gilowarepevomukevipa.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/24012944235.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/belowolati.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109121153059897.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/dekuja.pdfIn PDF document text
    • https://apra.pl/files/file/45761043906.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=pixel+gun3d+mod+apkPDF 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_off0000dbcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DF 17044 bytes
SHA-256: e8e2edb601ca9c8af1b777dfb160fb5830df8e865d312e52b9e0e3b2d1721380
font_02_sfnt_off00012017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12017 10836 bytes
SHA-256: 765ff58d98a1c922370fe712d2da11b34b280b90cec3de622b5d4c34b3682047

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