Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb9942258b136b26…

MALICIOUS

PDF

79.8 KB Created: 2021-09-16 01:04:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b10ab84242c00f9676df4542ece5dd58 SHA-1: c90297640e9eec71705dd5c81abf477e6701df8b SHA-256: eb9942258b136b26a7eb0599d60cc63b9342d07887a3fa2f5f9d9d409d37f7b1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is designed as a link farm on disposable hosting, with numerous embedded URLs pointing to potentially malicious content. The presence of external URIs and the overall structure suggest an attempt to redirect users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://smidgel.ru/uplcv?utm_term=openconnect+for+android PDF link annotation
    • http://schule.havonix.com/ckfinder/userfiles/files/7358698154.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/8970208162.pdfIn PDF document text
    • https://mhreng.com/userfiles/file/95266731127.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/65374409607.pdfIn PDF document text
    • http://riasztoszolnok.hu/admin/fck_upload/file/68049451436.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/94934536296.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/87985986620.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/46917348050.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/61560830266.pdfIn PDF document text
    • https://biodez.lt/i/File/522694204.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/mexitekuxu.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/gomijufepuvavu.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/zadelin.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/68812875431.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/coniudddshs9n2dq84ajrr8c46/11758418954.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///gatanojudapezexor.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/91363711236.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/4679176068.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/45721588803.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd40606d3b---zolafaf.pdfIn PDF document text
    • http://8njl.com/userfiles/files/70106189140.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/16614417968.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_off0000d1b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B3 10424 bytes
SHA-256: f0a5a7695b616f728d46dd8ab0ab3989393629d701d4a7196ebbb3cb8edc5c9b
font_01_sfnt_off0000e973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE973 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10185 18644 bytes
SHA-256: a4e940d2c34064a068f1fd81c818b0d8ab861d060c21b0df6c516e7f4b24d697