Malicious PDF — malware analysis report

Static analysis result for SHA-256 939efcca433d192d…

MALICIOUS

PDF

85.7 KB Created: 2021-09-20 02:11:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 807c96c1eaf4eca73eb980e2b3eb1a79 SHA-1: 4934b7ce4edb9a7a03397da006d3e22d97bd3e58 SHA-256: 939efcca433d192ddc7ce431684ecd6319645273803836be1d3e279b35bc9141
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic analysis revealed it functions as a link farm, embedding a large number of URLs, many of which are hosted on potentially disposable domains. While no scripts were directly extracted, the structure and numerous external links suggest the document is designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://sfipl.in/userfiles/file/dewopemezelepizokif.pdf In PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/18509306185.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/lijedabikonufijosuve.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/32402798908.pdfIn PDF document text
    • https://activepymes.com/pub/file/23056158489.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/60307269219.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/30443163872.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210918_1C79B1794D33C527.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/83319274043.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/39918713311.pdfIn PDF document text
    • https://9ja-bet.com/userfiles/file/jodeleva.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/352188631.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/gapegofaki.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/susavonujapadiwigero.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/lepojo.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/revejobitemavivefexegumul.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/renanabulajurepiwu.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16130fe1d0eb95---27423480206.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/0o3osks9qt8d6un0unav8ihe80/gulanalikujobup.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/25944849624.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/58800504096.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/83214410696.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/tugigikukokazavegise.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/xotulokapovijedazuteji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=bike+mayhem+mountain+racing+apkPDF 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_off0000ea4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001025f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025F 17348 bytes
SHA-256: e6b54328daa5d16bc02c0f069ced2e3b69cda7c59a58d06bb2d8b400c0d0ebe6
font_02_sfnt_off00012f87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F87 10968 bytes
SHA-256: 58a9d11e6afa97397ef4b9c45dc47ea46bfcec2815f9c50bf28577b25df27034