Malicious PDF — malware analysis report

Static analysis result for SHA-256 575290932598a2b5…

MALICIOUS

PDF

73.3 KB Created: 2021-09-21 03:11:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 334c8c88d63d9c65ba840b5f2db24567 SHA-1: dd65361a7efc2f1a44663bba91b29cda82c734a6 SHA-256: 575290932598a2b53126836868209ba7e6d129c0caf8d91598b1e57056b891bb
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 links to other PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The presence of a 'download star tv app' UTM parameter in one URL indicates a lure for users to download potentially unwanted or malicious software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://ebus.myskoolapp.com/FCKeditor/FCKimgUpload/file/xakuvud.pdf In PDF document text
    • http://tuyothuyluc.vn/webroot/img/files/lofoguvekuk.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/16274837485.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb37d8e3b4---56065986104.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/83859026559.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/bitisunaw.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/16407674398.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/94552903080.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/34881660095.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/52677924168.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/53445147146.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210919_142749.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/rudasupevubumovab.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/2477067787.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/volevunatovepuninefam.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/xizovexevamisaxamepela.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94203298966.pdfIn PDF document text
    • https://pierrelemagicien.com/userfiles/file/64986266271.pdfIn PDF document text
    • http://pmke.cz/pictures/files/rufobuwa.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/kejuwegivawasikutuge.pdfIn PDF document text
    • http://c-amc.com/upload/files/25447543024.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/59564693212.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=download+star+tv+appPDF 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_off0000be97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE97 10316 bytes
SHA-256: f0e580c8d6188a12364d843878ccfcf664a203408ff8ae77eaba9dc608040596
font_01_sfnt_off0000d60a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1C 16344 bytes
SHA-256: 79333bfd276eb28d94c41aaa6e8821fb258a9b5432bcc780636a5928085d6e6b

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