Malicious PDF — malware analysis report

Static analysis result for SHA-256 242c7e964c62719e…

MALICIOUS

PDF

79.9 KB Created: 2021-09-16 07:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 11f2aa031cbc846039fe1427a64ad1cd SHA-1: 7075c410491a24a96efeedf538d255579f1d9006 SHA-256: 242c7e964c62719e2943f32ea4ef31cbbd5365e1295d7b3d97aff9ecc36805e2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is a link farm on disposable hosting, with numerous distinct hosts. The embedded URLs, despite some being marked benign, contribute to the overall suspicious nature of the document, suggesting an attempt to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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 http://ikkosushi.com/uploads/files/39070735579.pdf In PDF document text
    • http://chelseafoodmart.com/uploads/files/renatode.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/robamepobudepupazuwiw.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/tubefovakarerimom.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/zowux.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/16757964298.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c00ec96cad---lemanelewuvipeseno.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/lafimopimowetopuru.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16315998745758.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/1250560614.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210916_060954_7277.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/76829444653.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/wifofupinevazojoliso.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/fuboliwetobiso.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/30680039883.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/logufefan.pdfIn PDF document text
    • https://thebillionbottom.com/business_school/uploads/file/62525118203.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/vegerixejigiratowigutama.pdfIn PDF document text
    • http://sromedical.com/file_media/file_image/file/repuganotosemerubiginaz.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/lisojat.pdfIn PDF document text
    • https://megacook.pt/site/upload/file/jemajonirebala.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/d457b3cb41cab54e525d935277fcbae1/dalajegiwuwabuboxutoxa.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/49668444585.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=apk+hd+cinemaPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0ED 17340 bytes
SHA-256: f2ed7a17ea4b9ded382a6156c5cfa122147622385093c1656179b6aa7711aaaf
font_01_sfnt_off0000da36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA36 15952 bytes
SHA-256: 8562a0848e81f092fbce162f4f9a204e8a467ac4f29beab6b64d4b3c690d49b0
font_02_sfnt_off000102f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F1 10320 bytes
SHA-256: 552128a0e2bae6490b42e5d70b7061ba5406c938ca76fcd8d49366428acac6ed
font_03_sfnt_off000119ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1