Malicious PDF — malware analysis report

Static analysis result for SHA-256 94a37b9bd499acbc…

MALICIOUS

PDF

82.6 KB Created: 2021-09-22 22:09:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d6c5c4e3756dc0cf566ce372a089fdd4 SHA-1: 3c8f73f983473444208c1e0ff3a1e11bda036e44 SHA-256: 94a37b9bd499acbc24c5060200099d0e4b0081dddc67a00bcb62eca07060b737
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://cructi.ru/uplcv?utm_term=farm+sim+16+mods PDF link annotation
    • http://vinhthuan.vn/upload/files/duvolupedajepubumudisak.pdfIn PDF document text
    • https://upaspor.com/resimler/files/bubafefir.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/82339638297.pdfIn PDF document text
    • http://bikaji.zohukum.com/ckfinder/userfiles/files/bedikuxabedalefanizulo.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16142156c9a11e---buvenojigumene.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/88146357388.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/gasekuwazekon.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/tawus.pdfIn PDF document text
    • https://people11people.com/uploads/File/feriwoxowitegikap.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/kinobusunub.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/20057377834.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/7163707683.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/1245664781.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/66526425420.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/31890787847.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/27968018620.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/xabarezipatugusimikoxu.pdfIn PDF document text
    • http://sgrdinstitutionspandher.org/sgrd/userfiles/file/dozodoniwadubifuwu.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16148a0c628c1b---padenadakedenusafuja.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/74971302670.pdfIn PDF document text
    • https://vitanov.rs/files/legajovumokusujinit.pdfIn PDF document text
    • https://megalight.lv/uploads/files/47401933178.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/zenasuwapibalulasumovugel.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_off0000df41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF41 18448 bytes
SHA-256: c9c99f8fe1eb68777cc4a34b1a6e9659727526e3ff67062d27b017c580dd9650
font_01_sfnt_off00010e44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E44 10228 bytes
SHA-256: 1b32d737361375f6b1c7bd291ea73c0f90ad07c7256ee2051f807d25edaf35c8
font_02_sfnt_off0001253f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1