Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6e0dbebd2511c51…

MALICIOUS

PDF

70.5 KB Created: 2021-09-24 21:59:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cfda574196f89c767262ebc95191d3ed SHA-1: 50730e7486d8545bb916cf4ea42e09c8141c18f4 SHA-256: d6e0dbebd2511c51d333146caee516dcde826c52e3d757c284e8bde164091a46
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to various domains, many of which are structured as link farms. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, suggesting an attempt to obscure malicious activity. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the structure and embedded URLs suggest the document is designed to redirect users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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 https://catamma.ru/uplcv?utm_term=oxford+handbook+of+general+practice+5th+edition+pdf+download PDF link annotation
    • https://tradingphrases.net/userfiles/files/10219464620.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/86450366405.pdfIn PDF document text
    • http://stefani.cz/fck/file/96022023224.pdfIn PDF document text
    • https://gift2goa.com/ckfinder/userfiles/files/7219702526.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16142c9a934f0a---tivegomowikovomuve.pdfIn PDF document text
    • https://kermanrooz.com/img/files/lusujimukoxenajevun.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/gaxipexasudafuvagowi.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/5038967167.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/14261626462.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/tufupiga.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/puxomuzobatamijusur.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/66172019400.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/lujuvogatitibu.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/razorawesajurusebowa.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/8679787956.pdfIn PDF document text
    • https://monyetjoget.com/contents/files/xaxuzopopafoji.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/35944378059.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/98660544992.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/melijabuzipak.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161305bc4e2ed4---rebewo.pdfIn PDF document text
    • http://kaies.net/upfiles/file/32843220192.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/94981810996.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/17858540545.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/50867395420.pdfIn PDF document text
    • 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_off0000afcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFCF 11312 bytes
SHA-256: 40d5ad946d6bfef0d644ba450a125a50ee46bb1a3b083ed309d366b240bca1ce
font_01_sfnt_off0000c9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FC 16456 bytes
SHA-256: 1f3b0e629e22898f7a552b9dab10daf00c37edb99354b0960fe602dab568635a
font_02_sfnt_off0000f3f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1