Malicious PDF — malware analysis report

Static analysis result for SHA-256 c31273a6cf9e29c8…

MALICIOUS

PDF

73.0 KB Created: 2021-09-09 01:07:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 197d31de504c2c85d24c67b0084ba62f SHA-1: fed6e6ec7f03c30943ade926986bfe73f8ae6075 SHA-256: c31273a6cf9e29c8c672348c9e20e9e4722aa1d9a2d2dcf670c3f3f5723356b4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous embedded URLs suggest a phishing or link-farming attempt, likely to lure users to malicious sites. While no scripts were explicitly extracted, the nature of PDF malware often involves JavaScript for exploitation or redirection, hence T1059.007 is included.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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://erpos.sk/data/files/nazesigug.pdf In PDF document text
    • http://kubabus.cz/novy-web/upload/file/josajakegonubagut.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/fesivifowemabiwizaso.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/75917876204.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/wenabebajotunofokixagule.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sigubexura.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/luset.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/59059245048.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210907023556.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/37399258744.pdfIn PDF document text
    • https://movingalpsfoundation.ch/userfiles/file/metusupeligedij.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/76802059789.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/dojidazofuleva.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/gewifubuma.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/26212202574.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/41162877578.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/96894454000.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/filufowapox.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/271445232.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/459ac3a106ad2d8a8c2a707b65679200/86589398116.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/90040488746.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/9o36vbqlr12nqv3afhm5krmskp/63497815374.pdfIn PDF document text
    • https://salonrewards.ca/images/file/galaxuniladimawofujazudoj.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/puvubonofaroratinuka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=mobogenie+music+downloaderPDF 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_off0000bac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAC6 10936 bytes
SHA-256: 5222c2ccfad9a88e18652bf781094beccc036a52bd5110fefd6cb4bce5dab541
font_01_sfnt_off0000d3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EA 16272 bytes
SHA-256: 70b9b811503a29444d3e44972b1d1e10e937aa2603e54f39fa25567c252c5949
font_02_sfnt_off0000fdf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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