Malicious PDF — malware analysis report

Static analysis result for SHA-256 f31b56d334135718…

MALICIOUS

PDF

75.6 KB Created: 2021-03-18 09:13:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 743de8f2323aa28de8a96745604927f2 SHA-1: 6890d5565d099585da6e8f82abdc30bbbda52406 SHA-256: f31b56d3341357185d101205ff1cb3e96293a70edc6d8180a928fcdf69b8ed99
64 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating numerous links on disposable hosting, suggesting an attempt to manipulate search engine results or distribute malicious content. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8659

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 https://kuzutuzo.ru/aws?utm_term=o+que+significa+direitos+e+deveres PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4393893/normal_5fca6a1d8105e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486534/normal_5ffa714732695.pdfIn PDF document text
    • http://demuxum.getenjoyment.net/pdf_to_word_converter_offline_full_version.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387244/normal_6044d0ecaa9c2.pdfIn PDF document text
    • http://puwobero.22web.org/development_economics_debraj_ray_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368731/normal_604a233a26116.pdfIn PDF document text
    • http://xubanapirobula.mypressonline.com/15639991196.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392191/normal_604eda9664bb1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369525/normal_6007d429e7e00.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bezutu/91523394129.pdfIn PDF document text
    • http://kuwitabetegipo.myartsonline.com/2629241579.pdfIn PDF document text
    • http://daboloxasorun.rf.gd/leziradovudevax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5f2fc23-dad0-4b78-97be-5ec011be63fd/childrens_bible_story_videos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/267ed2b9-e0d6-48c0-8cc7-3c65b4def385/safety_hazard_examples_at_home.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf51716e-a95c-4fbd-96b7-2a76a1cf5b41/79940604749.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43f779c7-2d69-451b-96ca-1aaf75047147/zunovetikasojemuxiraxu.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/fishing_guide_osrs_theoatrix.pdfIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/muzamemirutu.pdfIn PDF document text
    • http://medexode.atwebpages.com/todos_los_nombres_biblicos_de_dios_y_su_significado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd37a892-6c00-42aa-899d-10b914d4e6bd/three_words_to_describe_poetry.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77B 5368 bytes
SHA-256: 00b9ec4e1133621f4e2c4d586d81d08384e3aafa6a541b5da3d979ed75dbc211
font_01_sfnt_off000109d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D7 13796 bytes
SHA-256: 6434599de3aa1e38da5fd3778055e3818edb1202c314d5322e685e9545670676

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