Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d13d573539a3c08…

MALICIOUS

PDF

88.2 KB Created: 2021-10-31 07:17:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8526d947c0b7248abd14c5a4a8311a96 SHA-1: 17563a8ab6e81c86ea3c52ca49cdd7b52bd86b2d SHA-256: 8d13d573539a3c08212bf5a2b44335080153fbe4b7c0c40af975875555b7803f
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and the 'Fake invoice / payment lure' heuristic strongly indicate malicious intent. The document contains numerous embedded URLs, many of which point to PDFs hosted on disposable domains, suggesting a link farm designed to distribute malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://dmshospital.com/mm_engg/files/dalusekojamafuga.pdf In PDF document text
    • http://uni-soar.com/userfiles/file/59344148210.pdfIn PDF document text
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/8132065040.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021102908514624.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/duvoga.pdfIn PDF document text
    • http://goang-hann.com/uploads/files/202110310926491843.pdfIn PDF document text
    • https://smilewax.tw/uploads/files/202109281921375047.pdfIn PDF document text
    • https://t-groupvnxkld.com/uploads/news_file/26643274835.pdfIn PDF document text
    • https://gilbertems.com/videos/file/wekevulotalogojezur.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee6dc6cbdc---bisaniwonuxunog.pdfIn PDF document text
    • http://shamayachts.com/upload/file/74366514247.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/delurirugidanituxa.pdfIn PDF document text
    • http://palami.by/images/file/56556388037.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/kireposegasof.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/ganabubebusebe.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/78008892483.pdfIn PDF document text
    • http://carbonelite.ru/file/kimam.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/pitenuz.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-20-14-11-18-33.pdfIn PDF document text
    • http://7878.ir/uploader/file/26790865701.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613875748bcce---tavupuvizalotakuz.pdfIn PDF document text
    • https://miminku1.com/contents/files/78712368134.pdfIn PDF document text
    • http://vititanon.com/user_img/files/bununabadized.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/xixexuvesakarizarilu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/oscUj7J0Gjw/uplcv?utm_term=2nd+government+stimulus+checkPDF 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_off0000f333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF333 18004 bytes
SHA-256: b96e25f8b335880a9922cc5f3f820d4bc9628462ac5a991ce70fa44f7bd6e7e0
font_01_sfnt_off000121ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A03 10936 bytes
SHA-256: 1ac63c6960b195b330293b3d481c7d3656485c79192aae2b974f141f8a7ec412

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