Malicious PDF — malware analysis report

Static analysis result for SHA-256 2707aa64d9c3404e…

MALICIOUS

PDF

81.1 KB Created: 2021-09-18 09:09:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1af96e0a51864b90277ede8d24d7d55c SHA-1: 10c4d6cfd1f649c9d8d86ecfacfa79f718bd8cd5 SHA-256: 2707aa64d9c3404e4f6f0161fe0d220996bf0d4ca78e1423c41552137049e70a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, and exhibits characteristics of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this behavior. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://nomylo.ru/uplcv?utm_term=new+play+store+app+download PDF link annotation
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/d914db9f7e550e31694a3c148da5902d/rixavuraze.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210902122643.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/bupijikowapuv.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/tukosukuxos.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd728dfafb---5734502492.pdfIn PDF document text
    • https://ptkas.com/kingkong/userfiles/files/nolowuxibonaberir.pdfIn PDF document text
    • https://geloracinta.com/contents/files/52285487935.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/zifuwadolofutegup.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/63478233321.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/21769107209.pdfIn PDF document text
    • https://emmaushuis.org/pages/bujunexapujusuv.pdfIn PDF document text
    • https://lekkermooi.nl/userfiles/file/69904313198.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/tojosikiwefukonatitubure.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/fanolefusiminipozupavupu.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/94031080702.pdfIn PDF document text
    • http://bibikid.ru/upload/kinezegixoxigojit.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/kejodemabibivudurufufelum.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/disojugirugexagavukadozo.pdfIn PDF document text
    • http://csigikes.hu/admin/fck_upload/file/55089121254.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/70593043631.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/18727644400.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/57208797932.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_off0000d9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C1 10468 bytes
SHA-256: e1b2a35269bf205bf0f6a41e1917fdace7ae00c29da4fa079852cafb001d9236
font_02_sfnt_off000109c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C7 17580 bytes
SHA-256: 5c231c7384e46ffc189745d93ccf37df1d3c8c95b0dbebe9ce265b61daf11aa9