Malicious PDF — malware analysis report

Static analysis result for SHA-256 d136c3f174f8fbc8…

MALICIOUS

PDF

151.3 KB Created: 2021-09-20 03:20:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 379a6e4e954f9c251c76280e20f75ba3 SHA-1: a68826c1e9c3c559ee3a61550b815cc579bf9417 SHA-256: d136c3f174f8fbc8a568934b8a4963dd5c3f1074f2ed489181e34d977cbb9163
64 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable or low-reputation domains, suggesting a link farm or redirection scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5089

Heuristics 3

  • 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
  • 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://old.smartplus.pl/ckfinder/userfiles/files/zenatedisetijexamidadera.pdf In PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/fepafibumavepe.pdfIn PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/81076722425.pdfIn PDF document text
    • https://temahr.hr/files/bubomedurufu.pdfIn PDF document text
    • https://euronuts2009.ge/files/files/kebazuzo.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/disekepizagobajit.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/56312878737.pdfIn PDF document text
    • https://hoavily.com/uploads/files/34207434264.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/lijalokef.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/3416191890.pdfIn PDF document text
    • http://jlsxjy.com/right/UploadFile/file///2021090203082873499.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/soxedavinefeb.pdfIn PDF document text
    • http://vo23.ru/upload/file/68393486025.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/5fc70cc38dd5e056c92a0d914f8ac272/sileji.pdfIn PDF document text
    • http://101balkon.ru/upload/files/19733940156.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/69197303624.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/96447253595.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/kanakejinusakone.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/13008622725.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/e275eb49109cb8306ebf7a5dd7839051/fufire.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/jowaxajopo.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/bifaboba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=custom+rom+for+redmi+note+3PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001fca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FCA2 10608 bytes
SHA-256: 6a18f87d922584b52b6bf926d81b08ce5112b711d9613b2243fe01528fdad02a
font_01_sfnt_off000214ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x214EE 21524 bytes
SHA-256: ef9ada29fded81b435f0e38495aed2c0ac8d0260ac0e8b33abc6b12fffa06098