Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecc9b6d0c69fffde…

MALICIOUS

PDF

82.7 KB Created: 2021-09-18 16:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2e11235bc721f4472b262b928e7b7d19 SHA-1: 629d3dbbae3a9bcc61b03aaea256d192196fb995 SHA-256: ecc9b6d0c69fffdeae4a40765954911c5a109f44c50447767f74860ed7f8f3a4
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier also flagged the PDF as malicious with high confidence. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 4

  • 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://e-motorcycle.tw/upload/emotorcycle/files/biked.pdf In PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/dekumama.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/jagopikasixasewifo.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133ade9df942---65412499451.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/jupabinovetuleramepuguxi.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4ea2309ad---veteragupaxuzovubog.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/minube.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/81435817764.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/50966498666.pdfIn PDF document text
    • http://rayer.cn/d/files/36974568787.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/214583140061436c470b8f9.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/52355627978.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/gidulak.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/juwoweditulomipokafamogab.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/boropenuxek.pdfIn PDF document text
    • http://cartopack.com/Images/file/roxowumupevusado.pdfIn PDF document text
    • https://ysh.my/userfiles/file/36121949664.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/fuzerazuduxedipepo.pdfIn PDF document text
    • http://tabletopad.com/images/file/raxatijagajunanaxixonelej.pdfIn PDF document text
    • http://juentai.com/userfiles/files/69707497481.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/melatebumegoz.pdfIn PDF document text
    • http://vhz.cz/user-files/nexosup.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/82910653352.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/88208616939.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=importance+of+water+to+rainforestPDF 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_off0000dce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE1 10632 bytes
SHA-256: 4140c02c162f8a44d85f5fc1e7ecbb943f06ef6fc180de51323478e6a0933b53
font_01_sfnt_off0000f540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF540 18456 bytes
SHA-256: 9c32a4bfe40bcfd5e68a038bc8489e4e75d2d28fd749cddd24842a4edd499313
font_02_sfnt_off000124bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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