Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b74fedff10290ae…

MALICIOUS

PDF

77.4 KB Created: 2021-09-18 15:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7936fc059586efbb643e1e09e36472ba SHA-1: 98ac6fd07af46027bfb02d30fba7a8e6c27e7262 SHA-256: 8b74fedff10290ae89d4a92e99540369b382f0d87003c08947a20e7782403ac9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous embedded URLs, many of which point to disposable domains and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware delivery. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://infrive.ru/uplcv?utm_term=lightroom+apk+free+version PDF link annotation
    • http://harmonie-avion.fr/actualite/files/tevepigobavub.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/nagojoral.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138fc6619f0c---duximawimogukoguxox.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/govokosesuxa.pdfIn PDF document text
    • http://fitviewer.de/files/file/zovenafalusam.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/44676482906.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/vifer.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090304175073499.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/gaparafa.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/manegiwabirelafosisasef.pdfIn PDF document text
    • https://funbugs.ie/files/file/waporolosunow.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/40313912814.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/titumejubibejuwojod.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/labanefu.pdfIn PDF document text
    • http://staropolski.net/Upload/file/41171538644.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/rakutilibeke.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/55019634537.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/34020240363.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109031145155856.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/57847189258.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/161358e78d9c20---tiramigivujo.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/gigogorekexiw.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/57545969354.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/razaku.pdfIn PDF document text
    • 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_off0000cb55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB55 16612 bytes
SHA-256: 9597af5d0e5f2dee2635402f805072f19c224ae04c42eab970916f23f9c97ffb
font_01_sfnt_off0000f68a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68A 10876 bytes
SHA-256: eb1ff21ffa1114f93aa568c1afae054a4c6f66c84efe998f7e19b4f258ca681e
font_02_sfnt_off00010f92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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