Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf7624ddd91dac03…

MALICIOUS

PDF

71.9 KB Created: 2021-09-16 01:06:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 10ebdce5ecd84dc21fdf7df8d28b900f SHA-1: 0ff78f7991776476e1966a460b7b5bcf8f062c6a SHA-256: cf7624ddd91dac03fd0bd6c35c40b2fde2dce50429327b8d9c9b4c97849c28cd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16140769a4874f---fawuzujedovigik.pdf In PDF document text
    • http://billsky.ee/files/file/56953810854.pdfIn PDF document text
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/zalofegumojinatagatag.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/tenumafilupix.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/58221259787.pdfIn PDF document text
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/buroburoputeg.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/zuzugarekeberiba.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/debobar.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/12152014817.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/pemosivosezujirewimasewel.pdfIn PDF document text
    • https://rajatotogroup2.com/contents/files/9415234335.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/25382839777.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/timedusotabegadasapitamoj.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/moziduwepanefado.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/28666716.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/90384930424.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/dibulusavinuxofiju.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/81611384563.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/sifanunobamitebuxe.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/84107350816.pdfIn PDF document text
    • http://medtravel.pro/images/hand_uploaded/files/sibenijitanul.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/fegivuxujowa.pdfIn PDF document text
    • http://vektor28.ru/userfiles/file/8596200441.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16133ba113394c---guvetazusinovo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=the+soul+of+america+pdfPDF 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_off0000b826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB826 10744 bytes
SHA-256: c1a35bfed6abd89458f4bfbb90df20a3b7654cf66239f069003bb74fe1a12391
font_01_sfnt_off0000d0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E3 16096 bytes
SHA-256: cca84f60df04baf260e285a7c2e7dc6d7e4f3e05b463d0c6d7d4930c455a83b3