Malicious PDF — malware analysis report

Static analysis result for SHA-256 12cdfc138c7771bd…

MALICIOUS

PDF

84.6 KB Created: 2021-09-16 08:44:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e971ec5771a0c742a647c14f45876002 SHA-1: 54c823b0f866612e1a68d9dcf312e7465e6f2914 SHA-256: 12cdfc138c7771bd141ad5b148cbae463b2ae459b0502350e58b2d3ce023f4e3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. The PDF contains numerous embedded URLs, many pointing to suspicious PDF files on various domains, suggesting a link farm or distribution network. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms this, indicating the PDF is designed to host many links on disposable domains. While no scripts were explicitly extracted, the nature of the embedded URLs and the link farm heuristic suggest a malicious intent to redirect users or host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614093a9b1e60---puzofedo.pdf In PDF document text
    • http://hanhthien.net/uploads/file/pudulibolotiga.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/xuvigopiwibavufulivisedel.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/viwezujukemegikukumi.pdfIn PDF document text
    • http://belv.ru/userfiles/file/latiju.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/ladofira.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/jetekikubulugotagupuli.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/woxidiper.pdfIn PDF document text
    • http://logenamerica.com/userfiles/file/sotadokadoparuvipame.pdfIn PDF document text
    • https://yogaspotny.com/userfiles/file/60188357086.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/59888477392.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/43340931569.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/37148665738.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/wogesapu.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/sexuromagerovu.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/binexonu.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/loritefiratagebevojenumu.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/xejemopenija.pdfIn PDF document text
    • https://agros.net/uploads/file/42776910126.pdfIn PDF document text
    • https://digireg.org/upload/88192736082.pdfIn PDF document text
    • https://highrise.pl/file/40508307058.pdfIn PDF document text
    • http://dkind.net/userData/board/file/wised.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=coc+update+sneak+peekPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE628 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3F 10492 bytes
SHA-256: 9e7a09f3457e0b041ead64805d99e0d947e1535ee41aca02f9c5d5527481b277
font_02_sfnt_off0001164f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164F 18084 bytes
SHA-256: eacc04dc61caa3b2f9d7878a8ff5bf34fa619cbe61cd966d8b633a3019187d95

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