Malicious PDF — malware analysis report

Static analysis result for SHA-256 93a6f1e150a30747…

MALICIOUS

PDF

76.3 KB Created: 2021-10-08 12:17:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0092bc44a7b109a9b69e756c8e5ae68c SHA-1: 6679f8ee09cfef8816910703a8f737f66efa5560 SHA-256: 93a6f1e150a307476a890d97583f336ce5a10ba560ce1a01567e74e12126985d
126 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links pointing to disposable domains, suggesting a tactic to obscure the true malicious destination. The presence of many unknown URLs further supports this, as they likely lead to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://nusantarabet4d2.com/contents/files/pogofuximuvufojafedu.pdf In PDF document text
    • http://nbc.com.vn/ckfinder/userfiles/files/7414440836.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f09a2e8b0b---17265531075.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/sunotades.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/m2e9btf0154tkp9elgphcncf12/31767828604.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/65613985725.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/wapedevowivaxipukot.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/pirezowar.pdfIn PDF document text
    • http://www.520amis.com/upload/files/79783240450.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/xakuw.pdfIn PDF document text
    • http://afro-safari.com/upload/files/rixopiporiso.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/40708278427.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/kejuroguv.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/xizanuz.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/vemawefaxuderedezazun.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/81943223153.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/foniwezeti.pdfIn PDF document text
    • http://zlzljc.com/uploadfile/file///2021090602552721.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/49915426143.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/18828935889.pdfIn PDF document text
    • http://no1sushinroll.com/uploads/files/67607577892.pdfIn PDF document text
    • https://shioturboapi4-xyz.com/contents/files/davolukosaxorabidup.pdfIn PDF document text
    • https://guijek.com/userfiles/file/kexatulunerobisator.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=different+types+of+aquifersPDF 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_off0000c4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4FF 18472 bytes
SHA-256: c08175e31726dbbf33cea199ad0be194b4b0cbccd2191034aa585a14bde23548
font_01_sfnt_off0000f326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF326 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3D 10668 bytes
SHA-256: db6c9f95f2f3744f50be44711c67b56062cc45f23c089072d8b3296c78809f4a