Malicious PDF — malware analysis report

Static analysis result for SHA-256 a058b7bc4e9be5cd…

MALICIOUS

PDF

80.1 KB Created: 2021-09-15 08:26:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 692f03ed7d479db7b9bdc00173127c24 SHA-1: 0b2fbd67d19ce11b8cca976247c16ca5717e1d72 SHA-256: a058b7bc4e9be5cd74ebf9f91676e0b6222b1884e36982d459540acb5b60b094
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=instalar+drivers+usb+android PDF link annotation
    • http://seghers.kr/data/editor/file/326408952613f843850b5e.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/42363843630.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/99630001390.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/70945046971.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161412177c9e3a---38907033126.pdfIn PDF document text
    • http://wsm.hk/images/files/30570969053.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/76213231800.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/99057227622.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/xuguxotepibujefajo.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/8071157048.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/fimup.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/81458981179.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/niforulekuzuwopemad.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/60955801869.pdfIn PDF document text
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/madidexatavebufogimesu.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/51214532739.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/bilebexesez.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/rumimanukonez.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/703ri54se1bnomovt5lpf1ks51/22623642012.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/loniguvajepojatipon.pdfIn PDF document text
    • http://papienbanana.com/user_file/file/49729473201.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/87279256634.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_off0000d47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47B 17596 bytes
SHA-256: ed53e67985ee0d7965fc6d4b3eda2e471e9b69a91ca7ccfee91a5cd5509df4b4
font_01_sfnt_off00010272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10272 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A89 10500 bytes
SHA-256: b97b89ecdb7b5bd8af8e74e6259c788e5ea0ace3156cdc684a9967465c8d156e

Open this report in the interactive analyzer, or submit your own file for analysis.