Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c3917a98d206188…

MALICIOUS

PDF

71.9 KB Created: 2021-09-26 07:56:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3887e6d0b2320b67456f0bf7053b3ee8 SHA-1: 37ca0967b3f4dbcb11ab64c17ef0526252113a2e SHA-256: 6c3917a98d206188ebc53260d9294ab27b266d6b1d0275dac7760e1e58a0d3ac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a strategy to obscure malicious destinations. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://oaklandscreche.ie/userfiles/files/60841070345.pdf In PDF document text
    • http://zhymwz.com/upfile/file/zolenume.pdfIn PDF document text
    • http://agro-norwa.pl/userfiles/file/54927863436.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/8023913426.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/79075302495.pdfIn PDF document text
    • http://3sdent.com/upload/files/70733254252.pdfIn PDF document text
    • http://tech-sub.com/userfiles/file/xoxapin.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/weboz.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210915_59392FC89E07B6D9.pdfIn PDF document text
    • http://aallergy.netlovestories.com/upload/files/zupojezirekebivanilige.pdfIn PDF document text
    • http://cx-gl.hu/images/files/61449732215.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/1592690785612f635d375b2.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/fojubejegatutilokofoj.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/89769606123.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613260cb83b9b---81838593507.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/gegasejav.pdfIn PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/pisovizufaru.pdfIn PDF document text
    • https://bem-sa.com/img/file/10023186552.pdfIn PDF document text
    • http://allier-genealogie.org/File:/fubikameganofaselal.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/83822295206.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/39434140157.pdfIn PDF document text
    • http://my-hustle.net/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/69684621869.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/lowidufepulimutafivabuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=download+mavis+beacon+for+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_off0000b2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2EE 17332 bytes
SHA-256: ea0cc2688b19f88c9bf131d62b3cd8661101d23574406015ed77d8c380516ef9
font_01_sfnt_off0000df20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF20 10832 bytes
SHA-256: 4b588842d901b9363ec67313a3ae0d76f44c1f498dbaaf40815b55a0f4c6db94
font_02_sfnt_off0000f81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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