Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fd1c40276aa3025…

MALICIOUS

PDF

73.8 KB Created: 2021-09-16 12:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 811fd903941f4ae5572da162c217d85c SHA-1: 1332e502686a6f0b840edba4a4c9b3306e0b199a SHA-256: 2fd1c40276aa3025792a7b30d2efb2db8acb2760c1362dbafd31d7b67a9775e2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, with many pointing to disposable domains and exhibiting link farm characteristics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and numerous external links suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://isabellepieman.com/userfiles/file/toxizogusafobamunenaw.pdf In PDF document text
    • http://bimbrlata.cz/UserFiles/File/89195097112.pdfIn PDF document text
    • https://tarsiman.ee/files/file/dadamomigolu.pdfIn PDF document text
    • http://centromp.it/userfiles/files/bewevofukenalafoj.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/dobenonenotawej.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/35747146240.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/30310381756.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021091109514373499.pdfIn PDF document text
    • http://napiarsaigh.com/images/48891105305.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405deb78f55---bokoleteveb.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109081728127541.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/25053699670.pdfIn PDF document text
    • https://ayurmitra.com/files/file/neguza.pdfIn PDF document text
    • https://hkpefa.org/editor_upload/file/veguxamajida.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/sejoxoguruzesomoxinebeg.pdfIn PDF document text
    • http://www.tahi.hu/ckfinder/userfiles/files/tewaxasijepojapulu.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/99132152443.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/33379826681.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/62388659122.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/15801618741.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/98591526490.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/fejemadadagifewimijisuzi.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/kosakafaje.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/redogug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=empty+folder+cleaner+appPDF 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_off0000bce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE5 17280 bytes
SHA-256: 721962f7e76db5bb101e8fc69fb55a6b805cbd04f9b3a85bd069a0279985e354
font_01_sfnt_off0000e9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A1 10620 bytes
SHA-256: 216ccbd7c24024b82d5d62c1277a90e45f0a3b272164b7290f508bbd0fdf1f2e
font_02_sfnt_off000101e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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