Malicious PDF — malware analysis report

Static analysis result for SHA-256 18bfd2e4e98902fb…

MALICIOUS

PDF

91.5 KB Created: 2021-09-10 12:03:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 46a053b91c93b5650c17cfafdcd449b8 SHA-1: ade5fb6c7951cddef876cca950e4545ed28478d5 SHA-256: 18bfd2e4e98902fb3f76a6eb2d0d27b49320d1e9fe4c814fd80f906437cb6ad0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 5

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=best+clock+and+weather+widget+android PDF link annotation
    • http://kantipursecurity.com/userfiles/file/77460826236.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/61646997325.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d1fd4aaac---buvut.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/pimojeripapedawolanumenez.pdfIn PDF document text
    • http://aven.su/userfiles/file/pigonuvereguf.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/tudop.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/11b143a13bff29d862316dfd1e579bd9/jinomurovajegatis.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/vuvodajavo.pdfIn PDF document text
    • https://zlato-stribro-investice.com/upload/files/58925607478.pdfIn PDF document text
    • http://portableandcool.com/files/files/nalarizibebapovela.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/76820400538.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/jowotufipizovipadosot.pdfIn PDF document text
    • https://pellevah.com/upload/files/wuxoguvig.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/rirefefopapixid.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/98201410227.pdfIn PDF document text
    • https://ibextrail.com/editor-images/jurux.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/fojuxakazedafijed.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/34060447141.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/28149874658.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d97580b3d---dusibavolejomexixugolowu.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/65005091077.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/libowolurefisavivovivep.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/vezegekukixusamoko.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/wivowawu.pdfIn PDF document text
    • http://tlumacz-francuskiego.pl/userfiles/file/81059155317.pdfIn PDF document text
    • http://greenbrier101.com/userimages/bejetasibipojifosafi.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_off0000fe8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8A 18612 bytes
SHA-256: e4711f9b054146d1f745d13374c85bcd0fdaf23a82558ec7d685417d8141e50d
font_01_sfnt_off00012f19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F19 10880 bytes
SHA-256: 198925f89d71905bf3bb44ddebad7a9091af47a3d404b16b05167769ce79c07d
font_02_sfnt_off00014816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14816 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1