Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d995c220ea1acea…

MALICIOUS

PDF

76.0 KB Created: 2021-10-08 22:13:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7a509db3d061f1d43913b55ca14581f7 SHA-1: 54e75fee7e50cbea76551febf27fb53749eed92d SHA-256: 6d995c220ea1acea5cadaf682d5f0d2199d242e823459f8640b3514be239b3ee
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains and are likely used to redirect users to malicious sites. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags the document as a link farm on disposable hosting, reinforcing the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://feg.vn/uploads/files/gowode.pdf In PDF document text
    • http://veszpremlizards.hu/_user/file/marevipunopovixagaji.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/27248959336.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/fipetazojevoluzudepako.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/79713273108.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615a7227d8c05---vexexapopivalijawud.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/3585717858.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/88583081628.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/30223199455.pdfIn PDF document text
    • http://eichler-kammerer.de/bagijatonevorem.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/kovix.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/bapujiganozaf.pdfIn PDF document text
    • http://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/fujabezokaketalakitid.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/28110562007.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/12195942004.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/95199162600.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/bubudadokor.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd84bd0add---sunewow.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/69790073892.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/sewubekusezuzipomejubu.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/bozofag.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/xuxipowazuribex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=nursing+considerations+for+diazepamPDF 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_off0000c5c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C2 17096 bytes
SHA-256: f046f7d7ec5d3ad8b8cc7c4017e31459d6c25d7a250ecdfa3eb9cd891f549412
font_01_sfnt_off0000f133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF133 11052 bytes
SHA-256: a56d4ea467bf2c0138d2321bd94616449bb477d79dc5d91ba1273bc20109a3df
font_02_sfnt_off00010acf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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