Malicious PDF — malware analysis report

Static analysis result for SHA-256 2887966ac2c19286…

MALICIOUS

PDF

74.3 KB Created: 2021-09-17 17:18:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 02f4de08cf1590e3f6ff020b08e0d8cc SHA-1: 22359ba34dc20eff542d8536848f744825b68fcc SHA-256: 2887966ac2c192863ecf1ce592b7537f774ae1f1888f96ac1a30f4f8fb73f59e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm designed to redirect users. One prominent URL points to a Vidmate app download, suggesting a lure to trick users into downloading potentially unwanted or malicious software. The presence of multiple external URIs and the link farm heuristic indicate a strong intent to redirect users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://mihalex.by/files/files/74867490682.pdf In PDF document text
    • https://wasael.com/userfiles/file/fefoneme.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/65853383797.pdfIn PDF document text
    • https://santaclara.com/wysiwygfiles/file/tanowekapufijo.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/nupik.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/zesafetamozufalumejexu.pdfIn PDF document text
    • http://tjchenxing.com/filespath/files/20210906075219.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sejax.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210905_8F9F23B093522C49.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613452046f47a---15007183740.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/bujemibiriwodedax.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/pozivi.pdfIn PDF document text
    • http://riph.pl/userfiles/file/najuligesudaju.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/sazujusar.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/potamubamotigede.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/wedarulagixolerisujiza.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/muxekexezakumunekumav.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/jowoto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=vidmate+app+apk+download+for+pcPDF 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_off0000bf52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD764 16988 bytes
SHA-256: 00c720d3983bcfaa0ceb4766644969293a644b9a589aa23e8cf8690e6aa57d86
font_02_sfnt_off0001032a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032A 10760 bytes
SHA-256: fe9ef32d7d72c9f93d869d251dee289b3198762b134033dd56fa0a6e86e078cc

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