Malicious PDF — malware analysis report

Static analysis result for SHA-256 919d1dd4bcb55c9c…

MALICIOUS

PDF

85.5 KB Created: 2021-09-16 00:18:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2dffdbc406281152022eff63e8451e88 SHA-1: c9d138681a8c7ab04092f2cd0339cc966b5a5c0c SHA-256: 919d1dd4bcb55c9c34abd5bf7945580d5f5ab6abd0a9be55fb58d5944bda0a52
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to potentially malicious PDF files, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination or host multiple malicious files. While no scripts were explicitly extracted, the structure and heuristics point towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomortiga.com/contents/files/18475305358.pdf In PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kotuxokuwuvujiketilo.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/mefalamojamilipanu.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/58342164618.pdfIn PDF document text
    • http://aromacosmetics.bg/assets/userfiles/file/doxud.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/wukugizu.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/dodekeku.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/kukelinewemizorojuxu.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/94184401980.pdfIn PDF document text
    • http://abnicum.ru/files/file/jaminaduje.pdfIn PDF document text
    • http://azco.friend-match.com/upload/files/59231349324.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/2b8f515868b52a7f4020c650d066b51c/fojif.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/35649087482.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/77674836202.pdfIn PDF document text
    • https://hijaulumut.com/contents/files/zexages.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/65908804099.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/47426691165.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/90192003645.pdfIn PDF document text
    • https://halkapsikoloji.net/userfiles/file/17324534626.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/9563381034.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/monotijovevezopafu.pdfIn PDF document text
    • http://mothertheresapublicschool.com/userfiles/file/76962689438.pdfIn PDF document text
    • http://asclyziarskyklub.sk/userfiles/file/86268783093.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/70534156802.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+get+emails+on+android+phonePDF 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_off0000e93d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93D 17620 bytes
SHA-256: 7025d64527015816dd1d026a3085d2c33d494643900bf7f765712b31912c5c4b
font_01_sfnt_off00011755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11755 10916 bytes
SHA-256: b9669aae963c20586e16bebec2dca5155cf1ee4f72be0d755bf4a847490d01cf
font_02_sfnt_off00013036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13036 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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