Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1660f7797b0fbc6…

MALICIOUS

PDF

87.2 KB Created: 2021-09-16 22:59:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3e0cc25159d5c5ad42f95e565d3a0ba7 SHA-1: d2e05b1e2fa892695df7ccbeac3af714f6d0d82f SHA-256: d1660f7797b0fbc6fd610e45166d832757e8d69955f66a41e1d773b93773dbdd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are structured to appear as file downloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the ML classifier 'ML_NYX_PDF_MALICIOUS' strongly indicate malicious intent. ClamAV also detected this as 'Pdf.Phishing.Trojan'. The primary attack pattern involves directing users to potentially malicious sites, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://ketchas.ru/uplcv?utm_term=file+sharing+app+iphone+to+android PDF link annotation
    • https://simpangkanan.com/contents/files/vifagujapariredu.pdfIn PDF document text
    • https://shiksha24.com/userfiles/files/dabimunaz.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/gobefiparomazixulifedeg.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/29e54af21e0d120b7507a0fcaca7d6ad/juzuzonesavo.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/xutigajofigunevedagav.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/6524796194.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109152343565824.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16139de80693cc---baxulebigi.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/27640860266.pdfIn PDF document text
    • https://educhina.mn/editor/files/50114301722.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/xudixog.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/limurobiwebakixotez.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/fepifobos.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/49403399280.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/suzererixelowavu.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/96505384869.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/xuberonalakox.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/gakutokegajigi.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/53591725058.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/64069411077.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/87872664149.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/ruzefokodazunuz.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_off0000ed08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001051f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051F 10648 bytes
SHA-256: 288b5ab2251d43684235773c92d6aa61349fbd6513838dea6fbe465b57aadb65
font_02_sfnt_off00011d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D2B 19140 bytes
SHA-256: 96b71ff5757523ad42e5003ae345dc9b587ecbde42160de91e609325a87d0494

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