Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5a4e9ff7077c151…

MALICIOUS

PDF

105.4 KB Created: 2021-09-15 18:23:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 37b2793c415ac94194fd84a1a3f34a85 SHA-1: 8f72249e643ba152b0be818abd112882f3325c05 SHA-256: c5a4e9ff7077c151cdc78b391a96830ff5a6b86f8f54048f3a6ddad12f31aa50
66 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9773

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 http://artio.pl/files/files/xobibifomipanore.pdf In PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/18972464445.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/telofakapunikiwasazalo.pdfIn PDF document text
    • https://ccskin.com/geektic/files/43252306671.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/47918655342.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/sepaneru.pdfIn PDF document text
    • http://strandedtattoo.net/file/49224903456.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/garujimofawolosijeles.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/28005630573.pdfIn PDF document text
    • https://mimpiindah1.com/contents/files/12885373803.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021090219015811.pdfIn PDF document text
    • https://cyklo-wellness-penzion-palice.cz/content/34041810022.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/mivodokuwumipiwetakal.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/447659904613750bbf175d.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/96657856125.pdfIn PDF document text
    • https://hinaweb.com/upload/file/39116536812.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/rurotarawigisakanunux.pdfIn PDF document text
    • http://gabortech.com/admin/file/kesizifirurajisujaju.pdfIn PDF document text
    • http://wacommerce.net/home/integrity/public_html/ckfinder/userfiles/files/nifidizewo.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/ligeviz.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/2a39c8c61f8911c0a34fda6109a69888/26945685350.pdfIn PDF document text
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/kupuritoxam.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/zegiwunarofamod.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210907074726.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614162a8bc383---vumuwijajotiluwabujigijuw.pdfIn PDF document text
    • https://nls.vn/upload/files/13572603862.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/woneruremobazojunakosuke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=silverthorn+human+physiology+8th+edition+pdfPDF 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_off0001308e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1308E 11508 bytes
SHA-256: 5cb111b50b7a7a7871ef98c4cfc0e35af2d88038773c8db1d35bebc5f4fc62fa
font_01_sfnt_off00014b69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B69 20348 bytes
SHA-256: a02c9cf99826f76db01a4b5704685589adfa2eab1746bb660385db39998992fa
font_02_sfnt_off00017fac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1