Malicious PDF — malware analysis report

Static analysis result for SHA-256 028d4330f9b5a996…

MALICIOUS

PDF

70.9 KB Created: 2021-09-19 17:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b2da460824cb7ecfc4bcbae1df183984 SHA-1: 96584852ab177d4cefeb78adca2892b4871b5a10 SHA-256: 028d4330f9b5a9964e2f50f91d24f55433ee66eee1a6b83abeb4dbb96e5228ac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous external URIs, many pointing to disposable hosting and exhibiting link farm characteristics, strongly suggests a phishing or malware distribution attempt. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis point to a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pistant.ru/uplcv?utm_term=pok%C3%A9mon+emerald+gba+rom PDF link annotation
    • http://studiomilano.eu/userfiles/files/61498216911.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/rigibuki.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/baniberatavolovajufug.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/tumasanuvuzagage.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/90631505954.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/5080220581.pdfIn PDF document text
    • https://msvadba.ru/files/file/dagunulaf.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/51353108113.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/fikitimeradupenavavoga.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///48121439705.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/gufef.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/k7tj6pjkosn6piofr93jdduar2/fatenepinegavagutil.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/memoretanirixes.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/99508392553.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/82129916149.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/fokabawumosuweja.pdfIn PDF document text
    • https://ajambary.com/userfiles/file/fezebarotatuvavup.pdfIn PDF document text
    • http://sun-tes.ru/files/file/63829436752.pdfIn PDF document text
    • https://asi-filter.pl/files/file/sababegib.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/winogojofezadaxonufozed.pdfIn PDF document text
    • http://lifeline-sports.com/files/file/65971760613.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_off0000b123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB123 16912 bytes
SHA-256: a052baacd1d7443acee7349a1c0bc2e196beda116a9823852383426f63ca0437
font_01_sfnt_off0000dd0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF522 10620 bytes
SHA-256: e15a70fe843d4af6c61dce013c98287ac8942d75cdc1ae00898e4d716651fa77

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