Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d6a7c3b0a0437c3…

MALICIOUS

PDF

71.8 KB Created: 2021-09-27 02:59:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f233aef207c3e59c0a4d5c580920b597 SHA-1: a46f9ef96075e33368b00c7a832024bec14fd044 SHA-256: 8d6a7c3b0a0437c3da4a324e080e0b52d473c44caacf2a87876e1e78cc891da9
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which are hosted on suspicious domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://taiwan-casters.com/userfiles/file/wozowepagukugala.pdf In PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/79229742675.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/kiwasisegef.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/9068388760.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/vobemun.pdfIn PDF document text
    • https://ksuskalology.com/images/file/23533966546.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/bipefuseli.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/24279811384.pdfIn PDF document text
    • http://darstin.com/userfiles/files/69118583035.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/kobugerojudufugavib.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/jirinogatenugelabudewi.pdfIn PDF document text
    • http://fjhi.org/userfiles/file/47294524547.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/nadibedijubakotenagok.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/2021921641361370.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/61563786138.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210926_5865FFDD05204477.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/19495207662.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161417225b8574---subime.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/14810445532.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/gisekebibevomoligufuv.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/14580615140.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614138deae812---85788270385.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/selalar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=s7+and+s8+comparisonPDF 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_off0000b4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F1 10732 bytes
SHA-256: b3275d56799a48180c0e1c4dd12d6c976d716c17ebc28e05d741c59dea70580f
font_01_sfnt_off0000cd87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE599 17416 bytes
SHA-256: bcf627b76ce4f2ae07b736053d3ec3e86d99b5c889d3d0e370fe9ff4f2f9bc18

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