Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ff832a6e21075ed…

MALICIOUS

PDF

83.2 KB Created: 2021-09-15 13:03:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 225dcd17929c305d9a7e3c46a46c30f2 SHA-1: a4599edea61c8efe3e4db26a5a861466634e9aec SHA-256: 6ff832a6e21075ed3f4dc0015e650c33ae354646f5bf8077d38db54a321a22d2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://hanahana.vn/media/ftp/file/duzuke.pdf In PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/veniwoziroxuridogigez.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/vemim.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613034a40a7b1---gasuriwiwaridibovoz.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/vubebiwo.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/bazapulekire.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/19896960893.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/93534775994.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/vadatefuxaw.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/jonugalupanadajule.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/161410f58df46b---tozenajibu.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/xalefiguzejesapulolapuvif.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/45923111892.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/841584630.pdfIn PDF document text
    • https://verner.lt/images/files/luzawunusevunadutevitat.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/pilozubozub.pdfIn PDF document text
    • http://gasasosong.com/upload/fckeditor/file/mamuxenizidu.pdfIn PDF document text
    • http://balbu.hu/uploads/news/file/42082443708.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/2932753516.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/70629037642.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/tomiwojasalutowo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+put+phone+on+silent+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://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_off0000e2a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A5 10664 bytes
SHA-256: 3d26aa7d962c4ae534851448adbf717cf3c336fbbc1a344710cbce60eae02bdf
font_01_sfnt_off0000fb06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB06 17620 bytes
SHA-256: f600661e7e6918150d5b2524f41249c1ee29261ce4bbbc60bd292e5a6034bf97
font_02_sfnt_off0001291c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1291C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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