Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8e652bba1a97465…

MALICIOUS

PDF

82.3 KB Created: 2021-09-14 08:32:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: efc802f74fb7cb88add1fa303132938f SHA-1: 1b036196195cdcf3a7a4222cd39c5f3763e9ad38 SHA-256: b8e652bba1a97465253e497f73a783c081f8c72a95111be151a080c4e72d8c96
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's primary purpose is to distribute traffic to other sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pixomot.ru/uplcv?utm_term=gamecube+roms+for+dolphin+emulator+android PDF link annotation
    • http://liveisagenix.com/ckfinder/userfiles/files/72160692006.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/fubanalodawimowuxuseburi.pdfIn PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/80914126820.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/tokakeponosinakeparizegum.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/79501938314.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/33111164883.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/77894719483.pdfIn PDF document text
    • https://lanjutpt1.com/contents/files/11679067145.pdfIn PDF document text
    • https://vas-vill.hu/userfiles/file/tapifatijebijanido.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/16065637726.pdfIn PDF document text
    • http://hanleyresources.com/images/29220204978.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/kadidunotidurutovuputa.pdfIn PDF document text
    • http://3asoft.vn/img/files/82780146209.pdfIn PDF document text
    • http://splogservice.ru/content/files/xumiwuwiniroz.pdfIn PDF document text
    • http://neodermclinic.com/file_media/file_image/file/19666868702.pdfIn PDF document text
    • https://toocapen.com/files/46421039373.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/toripugabemosujok.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/nederegadimajo.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/94279492444.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/tupanopabujajazewigabe.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/21cbf3ad837dc08ca90dccd4561dad0b/depiwasobujevirukevufunes.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/vofinifujitar.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecec06a649---zaguvemukizopuwiwax.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_off0000db80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB80 11164 bytes
SHA-256: 713f9048fa338c77eed7a13f430cba3d771d2305113902d638fa826a660081de
font_01_sfnt_off0000f529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF529 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3B 18016 bytes
SHA-256: eb0ac1cd098b87b623958c9f35cff40fafa26c6f81e3d8016e290d3874242022

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