Malicious PDF — malware analysis report

Static analysis result for SHA-256 da3d04ae1db24e12…

MALICIOUS

PDF

79.0 KB Created: 2021-09-17 03:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c226ef40c52bb2298a865fbffe9414af SHA-1: 275494458e3d8ccb22d1181b2f8ea46d3876e5c6 SHA-256: da3d04ae1db24e1293f024fc9af9e161a866d3c1358db31b021afb23d694a81a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links pointing to various domains, indicating a link farm designed to obscure the ultimate destination. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high number of distinct hosts strongly suggest a phishing or malware distribution scheme. The ML classifier and ClamAV detection confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://www.winsum.frl/ckfinder/userfiles/files/11385844106.pdf In PDF document text
    • http://teleinwestor.pl/userfiles/file/43889825785.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/48588224002.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/67313504400.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/pererufasu.pdfIn PDF document text
    • http://topbuild.net/content/xuploadimages/file/34165635166.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/vowexe.pdfIn PDF document text
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/66110137744.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/68517356466.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136cba6ba688---zoxafu.pdfIn PDF document text
    • https://liho.cz/UserFiles/File/21996295061.pdfIn PDF document text
    • https://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/71724114843.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/luvefigul.pdfIn PDF document text
    • http://hantechwelding.com/userfiles/file/2021090419284873499.pdfIn PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/43427879634.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/tkah16e7ejocfjll0jvcl6g77b/saregagejafosuzujiset.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/sefifi.pdfIn PDF document text
    • http://irpuyesh.com/cache/fck_files/file/xuvosuvumagurikexeza.pdfIn PDF document text
    • http://preiss.at/upload_files/files/4089002955.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/10492106266.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/rofawakafetetof.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/gizibebagurukufupiz.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/98650085136.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/bukimuworurujenuvowewoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=fifa+21+mobile+modPDF 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_off0000c6cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6CB 10336 bytes
SHA-256: 246e32bc2667fe98fa5103cb9136ebce9e3f607ea652fd3e1d889d22424d6af2
font_01_sfnt_off0000de1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF630 21756 bytes
SHA-256: a2943610ccc9363b0f99f866fe71d20ce47292db590bab414c412b410ee80d89