Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d7ad55aeebbc145…

MALICIOUS

PDF

79.7 KB Created: 2021-09-19 00:12:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 37610e06c2b405744604152ec32f6acd SHA-1: 0ee8a0c4af11299ec473eb72e2e3b05c20a6efce SHA-256: 8d7ad55aeebbc1451b073c1abae9be10585a38a75738e77f977cfb2ee1febe89
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external PDF files, suggesting a phishing or malware distribution campaign. The PDF structure and embedded content, though heavily obfuscated, are consistent with attempts to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://cloudinfo01.smartevolve.com/images/ckeditor/files/pebumetuf.pdf In PDF document text
    • http://satyavnetworks.com/fck_upload_images/file/nizovidedefa.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/rupovilademupajowe.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/37556464409.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/68474614531.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/85378825192.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/duvowafogow.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/829774ddb7a9c9b5bd1431074ddf9935/95275080875.pdfIn PDF document text
    • http://nato-denkmal.de/uploads/file/kaporonilapujuzajezed.pdfIn PDF document text
    • http://kingswaytyres.com/project/kingsway/uploads/file/56631850445.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210915222256.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/fukamekopetifavulasu.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/23382542683.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/86981476827.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/rexedidila.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/39163297415.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/bemed.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/zefudaxoxema.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/111620596353.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36892564885.pdfIn PDF document text
    • http://boldogelet.hu/media/69838175414.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffc2de9fcc---bevez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=fairy+tail+game+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_off0000d68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA4 10512 bytes
SHA-256: a6621ac8891f88de8529509e698842991efc746e47ecd75be46f83dfb0e2b9e8
font_02_sfnt_off0001064c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064C 16808 bytes
SHA-256: 9af9620cf3d3e1346677a8654f27517ae0d4f24110a9ffd5a1f670ea6d00209b

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