Malicious PDF — malware analysis report

Static analysis result for SHA-256 09bc64d716f2bb28…

MALICIOUS

PDF

68.2 KB Created: 2021-09-29 11:32:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: aae847e15464d9733924f407daf988f5 SHA-1: 4c1b54f303d36d1de574a2bbd12c677d2fd4c2da SHA-256: 09bc64d716f2bb2885746a78d30fe87df2ab7fe04c71cbf15471b926097f9bf3
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier strongly indicated maliciousness, and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the suspicious nature of the URLs. While no scripts were explicitly extracted, the structure suggests the PDF is designed to redirect users to potentially harmful websites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://wastran.ru/uplcv?utm_term=purple+book+download PDF link annotation
    • https://fullmagicweekend.com/ckfinder/userfiles/files/76359497075.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/49946821931.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/11709928435.pdfIn PDF document text
    • http://rcot.by/pics/files/fojadowavijadafivixalur.pdfIn PDF document text
    • http://guitarenko.fr/img/files/nofofelevugenojewidudovij.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/nuxikizam.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/68262672332.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/8d1aa4974cd0a505e6e6560e160e3fbb/tamarovalunagemozafoxuliv.pdfIn PDF document text
    • http://yepuco.com/uploads/files/palowikuzofilupubukex.pdfIn PDF document text
    • https://radio-clipa.ro/userfiles/file/vubipalonunopuvov.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/kejokewotunukijoramufena.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/26884872697.pdfIn PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/2481406637.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/xunosetugegidibuxikubi.pdfIn PDF document text
    • http://24cvety.ru/upload/files/lumusu.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/litemuvuvoxuseke.pdfIn PDF document text
    • http://kleni.cz/userfiles/file/32125503145.pdfIn PDF document text
    • http://homeloanz.net/images/e/file/59090805647.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/navukopizutazaj.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/gokameruwotixutat.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/bokazasawepeleme.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161482c2561d4f---37127933666.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/74155733958.pdfIn PDF document text
    • 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_off0000ae04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE04 15032 bytes
SHA-256: c8167d918afb2f5fba26e295aa57b63b72511084f6153002c3a977d77eed6987
font_01_sfnt_off0000d447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD447 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5E 10444 bytes
SHA-256: a20b5a5b0aff4d52b4ea962b6503139e2b48707f66940c0b9afa1c0734b59442

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