Malicious PDF — malware analysis report

Static analysis result for SHA-256 f01909d50d77543f…

MALICIOUS

PDF

67.8 KB Created: 2021-09-25 20:16:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f064f10b2478e4d640b4b68663e4413a SHA-1: e6e5218db8eb43f2edb2bbc6d81066a101f32994 SHA-256: f01909d50d77543fddfd47f369935e0f7b7f6bcafd98429c224554aa0a7ccdd3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://pistant.ru/uplcv?utm_term=tip+top+download+apk PDF link annotation
    • http://studiotecnicoligioni.com/userfiles/files/tazolexufitukizegidiviti.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/lejebefugojomesuzusifojo.pdfIn PDF document text
    • http://quaisetoiles.fr/img_pages/file/45975669400.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/43993034306.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/kupavejefali.pdfIn PDF document text
    • http://metallpress.ru/files/xopadinize.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/57583391653.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/73641338866.pdfIn PDF document text
    • http://ashioke.com/images/library/File/bajupowixorekanebabodizil.pdfIn PDF document text
    • http://miyisz.com/mingyi/images/userfiles/file/berafalanumefi.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/dotivowixeme.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/borivoru.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/49368533014.pdfIn PDF document text
    • http://terfigyelokamera.info/files/file/jatozonomadovu.pdfIn PDF document text
    • http://foxhill101.com/userimages/marevoz.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/rokemuwadaboxozil.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/bubotugupawigavekugavag.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/bofugazodinafobu.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/geremani.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/nafigazutirake.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/navavonixikeditimugaba.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/23/file/fujifukujemelumemo.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_off0000abe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABE0 10124 bytes
SHA-256: d3c73fb1fd00827b5138fce59ed8f06fa3ba1f19befc67813eb0c5992c119396
font_01_sfnt_off0000c29f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC29F 15600 bytes
SHA-256: 777e8c6a5076bcca9fbdc27cd779f782baddf727da7a810af7d18e42b35c3993
font_02_sfnt_off0000e9ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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