Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fb7448282c96989…

MALICIOUS

PDF

79.0 KB Created: 2021-09-10 00:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8c3bd880d9b4da3c892984ea047af2f5 SHA-1: 679250fc2686277f8c74829e30bcecfdfe07ae5c SHA-256: 6fb7448282c96989b5d050273dbca6fb0b7803d338f755f23dae3d4310464139
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9251

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://philabc.ru/uplcv?utm_term=antipolo+rizal+zip+code PDF link annotation
    • http://ecoaga.com/documentos/file/99658941086.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/43231604297.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/95349312618.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/1693645911.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/banatisumufagozekobafufo.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/seguziwipenitezolaramulak.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/68523318282.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/wibesefuvutarofoseferez.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/52472836492.pdfIn PDF document text
    • http://amdind.com/userfiles/file/11258801317.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/gapugowijidabuxipikap.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161376ccaefec9---zalolusarodi.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/runafixevasotukop.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/d55272f4d874ee4009710acb11da5056/bupivag.pdfIn PDF document text
    • http://sunway.me/uploads/file/092240199627.pdfIn PDF document text
    • http://viettranslators.com/webroot/img/files/44562235441.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/28997280638.pdfIn PDF document text
    • https://htchninc.com/d/files/virasamupiwagez.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/74235169373.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/68501016361.pdfIn 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_off0000dd44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD44 17836 bytes
SHA-256: f2a7a00ad1069bb02ff877e5b982107c7b3ea2ea9b96d80f3abd9f5653035804
font_01_sfnt_off00010bd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EB 10380 bytes
SHA-256: 0427b8427cf3996e7f575ccc51ee81f3e4fd835c1d98fea41e912c3eba9a5fbf

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