Malicious PDF — malware analysis report

Static analysis result for SHA-256 8999088e7c5fecfa…

MALICIOUS

PDF

86.4 KB Created: 2021-09-18 12:30:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5c5c74bdcd52c2394e4dc7c4e89f75c0 SHA-1: f93e8d8b12dafcf28bd71e18a5285510f4ee8da9 SHA-256: 8999088e7c5fecfa2dc702aba4b4f4726f759ee0a89d21d8e628501ca9c423ef
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://medvor.ru/uplcv?utm_term=how+to+lie+with+statistics+free+pdf PDF link annotation
    • https://wsbtitan.com/images/file/loxixekomerisibijam.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/vedipovirirapuragajila.pdfIn PDF document text
    • http://anpharma.net/upload/files/gijobesomive.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16143429cb5388---90249457742.pdfIn PDF document text
    • https://artdecor24.pl/uploads/files/40475503253.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/94342152752.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/43039921976.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/niraluwovo.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/49157314271.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/21136846487.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/43946006665.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/50950318521.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/68074055333.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/mutijisisa.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/23804127122.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/lufovoja.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/22442798686.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/48ebbde6a8394da304dd769674b99293/86957409686.pdfIn PDF document text
    • https://electroagro.es/pub/files/bezinowunotojos.pdfIn PDF document text
    • http://klientskazona.radeton.sk/ckfinder/userfiles/files/77336604660.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/ronuvep.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/piramasolisod.pdfIn PDF document text
    • https://tes-sys.com/uploads/ckfinder/files/20210905/16308558933155.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_off0000ebeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEB 18124 bytes
SHA-256: c30faad8687b30a9be3c202d202f32b5eb75e8328ae9eb8302c92fdb093ee885
font_01_sfnt_off00011ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB5 10688 bytes
SHA-256: c2ae7ae957f781137bf4903d64efc37967929b0e9d2e4d19be3b52c10029dd57
font_02_sfnt_off00013361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13361 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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