Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9a9a9245f26099f…

MALICIOUS

PDF

80.2 KB Created: 2021-09-15 13:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1f7456e7d03e796a8d5d81f28ba87946 SHA-1: bb3e5a7f5ab556c1df010f09c97ad3ff702f1e73 SHA-256: c9a9a9245f26099f7687b20bb9c854c72fdf21db9443d61645c0c57fa50e9096
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to compromise users via malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://philabc.ru/uplcv?utm_term=modded+subway+surfers+iphone PDF link annotation
    • https://horacebatten.com/ckfinder/userfiles/files/gepixidudujuwiv.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091018582420.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/tadabigupixo.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/tifepugu.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/36204278263.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/konoxavasezuwira.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210903011915.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/xumamavomozuxatage.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/nikudutagopegitifemowakif.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/34563373215.pdfIn PDF document text
    • http://tongkhomica.com/upload/files/46322023086.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/7e1fb216916354e4997b0e538b344aa0/34789815700.pdfIn PDF document text
    • https://raovat72.vn/uploads/news_file/sifatolugugoverosotibuwe.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/19860590470.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/51011454266.pdfIn PDF document text
    • https://metnar.pl/web/uploads/files/45352993505.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/7b62cfc313e30d65448a0fc8593b91db/xapigokiluki.pdfIn PDF document text
    • http://thongthien.vn/upload/files/gafepojaxivutagofixelafu.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/dezimapavewokezasomugelu.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/93410623447.pdfIn PDF document text
    • http://standardamulet.com/files/files/jaruxawurola.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/ruzor.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/12772129346.pdfIn PDF document text
    • https://elmawadah.com/userfiles/file/81891518537.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/vuzugapunajamifes.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_off0000d29e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD29E 10884 bytes
SHA-256: 4be784c5ee333a7b1da8993ffc3bea8b30701784c0b50ba1617fe046b5141d0a
font_01_sfnt_off0000eb8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A1 18464 bytes
SHA-256: a441732915d3d06a6761002c42b519d546aa842b0f81deb13c24ba768166e732

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