Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e6d350da9e1bd8c…

MALICIOUS

PDF

78.4 KB Created: 2021-09-08 23:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: eb5254ac6ec3795cfbba10ad73dc796a SHA-1: 87add397b26bfa782fb265e5cf3928d0132ec106 SHA-256: 4e6d350da9e1bd8c0665a816e70f39df747268e9c16f250f79bbe2ada8dada17
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm on disposable domains, with numerous embedded URLs pointing to potentially malicious content. The document body is heavily obfuscated, preventing a clear understanding of its direct user-facing content, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://xpress2.eu/ckfinder/userfiles/files/65718485071.pdf In PDF document text
    • https://il-gusto.com/images/file/20446881216.pdfIn PDF document text
    • http://petswithlove.com/cvsprojects/SSK/Source/2.0.0/images/files/58935942078.pdfIn PDF document text
    • http://thaide.org/userfiles/file/80598410225.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/zezunem.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/33985652592.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/3e20b9d10c763f726b6b26c9977a84f6/vedifunarelixafe.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/xoviwewofefumejumidi.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109010825044257.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351c8265f5e---80446783743.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/72813481844.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/tilap.pdfIn PDF document text
    • http://levotst.com/uploads/files/51391948137.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/42877259127.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/9627285056.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/mozuxunadewidivu.pdfIn PDF document text
    • http://scarpatti.com/files/54862438611.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/lobanigewe.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/65640201157.pdfIn PDF document text
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/2908637192.pdfIn PDF document text
    • https://ventsistem-bg.com/userfiles/file/fepodamizeparaduwinanuzus.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/37308603321.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/dadowevosejunonim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+turn+off+caps+on+androidPDF 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_off0000d1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CE 10612 bytes
SHA-256: d1154097c8ea3f1ad35f1bef319979bdad68d3a5f0b24f81f1462a0d861c416e
font_02_sfnt_off00010235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10235 16472 bytes
SHA-256: e556369dbcab45ac4a124d0a2594b4ebcce876e7011c64705fd7c0e709b4da5b

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