Malicious PDF — malware analysis report

Static analysis result for SHA-256 098ec3324ad795b1…

MALICIOUS

PDF

78.9 KB Created: 2021-09-14 04:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3a846032a218c4cad55d56931d98fd79 SHA-1: af48fe29d03ce7dcdf1aa1f1f0c92e891ffec04b SHA-256: 098ec3324ad795b185940b54d7565480f10c901bcb477d2f436cc177311a55aa
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by an ML classifier and contains numerous embedded URLs, many of which point to PDF files on various domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, suggesting a link farm or SEO abuse tactic. While no scripts were explicitly extracted, the nature of the embedded URLs and the ML classification strongly suggest a malicious intent, likely to redirect users to malicious sites or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7068

Heuristics 4

  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://pypconsultores.mx/userfiles/file/49494560053.pdf In PDF document text
    • http://montoaneli.com/ckfinder/files/botavaxetetigonuva.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/65073200348.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/23532376398.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/19581012259.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/soxator.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/55109058244.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/ketozotu.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/vakukafosapoxodumiwov.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/161355c2c569fe---40760490799.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/27942275958.pdfIn PDF document text
    • http://groupkaishan.com/d/files/58227934185.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/pijigamatibugesezem.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/milaf.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/34106989434.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/tasakimitod.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021091216021473499.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/57843635726.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/bulenixodepegowaxaxomed.pdfIn PDF document text
    • https://turasmobilya.com/img/editor/image/file/renozojofuzaw.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/32400692581.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/51858908191.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/80560312615.pdfIn PDF document text
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/bexezosudiwaguwubilun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=stop+chrome+reloading+tabs+androidPDF link annotation
    • 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_off0000d93e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93E 11176 bytes
SHA-256: 556350b2f3168dbf02331fafa8a8329c7bc3a1954035ed86578161ffd5964177
font_01_sfnt_off0000f2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010aca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACA 17916 bytes
SHA-256: e93e4b3f8dee098a0550dc6bba2c24a600b64624f97e0346d1631fcbb2b499ff

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