Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d911dff462898e7…

MALICIOUS

PDF

70.7 KB Created: 2021-09-19 00:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 45d36e8c183aa361beca42f6c6a8eb2f SHA-1: 7d1a8e5f3924a2c5194fc88b7ce2240d1d1cec26 SHA-256: 8d911dff462898e74a457c6968bca4fe4ae4a18bcc3b9b82dd8a56187288a660
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links, further supporting a malicious intent to distribute or phish. No scripts were extracted, but the overall structure and heuristics point to a common PDF-based attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://sweed-trans.eu/ckfinder/userfiles/files/5130823164.pdf In PDF document text
    • http://globalsublimation.net/uploadfile/files/xobezulamulawabaj.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/zotinukile.pdfIn PDF document text
    • http://systempro.kr/userData/board/file/wizoruvorinazomejutivi.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/28443690280.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/dakuxanowivud.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/burame.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/36773052048.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/tinikenasi.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/toxedavizozi.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/faguvurebuzakobegitapoke.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/ravikizegonoz.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/duzimorug.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/rabonex.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c169cb49b1---nuzobelabuzinevexizuvisox.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/xasite.pdfIn PDF document text
    • https://vleek.com/uploads/files/14964288735.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/76653657571.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/87875614973.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/2g9qk40mu2cfqac4689jbo7mb3/retepijibudumebipefob.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/vowujijudefuvedebitudodij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=hotstar+premium+apk+freePDF 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_off0000b601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB601 10552 bytes
SHA-256: de6b18d37e001676e94a8dd5d90f187e54a6acd6090b8722ec9149da32c2768c
font_01_sfnt_off0000ce1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1A 15392 bytes
SHA-256: e8d45572832ad892ccdc465b730b8f1c729043feedfed83ba1e54e5bed8b5d37
font_02_sfnt_off0000f53f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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