Malicious PDF — malware analysis report

Static analysis result for SHA-256 9edfa932f09529c0…

MALICIOUS

PDF

83.1 KB Created: 2021-09-09 16:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e8214d59181e9791f19ab49789b5fa10 SHA-1: da611fec635e853e9daca09cd0ffca7433011cee SHA-256: 9edfa932f09529c0d37e3bab9221ea0e4a64f9829929cb3588ab8556d05a75e8
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a large number of external links, many pointing to disposable domains. The ML classifier strongly indicates maliciousness, and the heuristic for a link farm on disposable hosting further supports a malicious intent. The embedded JavaScript likely facilitates the redirection or download of malicious content from these external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=can+you+send+an+audio+message+from+iphone+to+android PDF link annotation
    • http://synfarm.com/upload/files/13109557601.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/koxulezasatifumev.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/74093765618.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/20816589199.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/86749454062.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210905_020050.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613141180b57b---90352018730.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/3144048397.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/93283383924.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/32371269639.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/25228252678.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/sakujipow.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/foseg.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/71445361680.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1a0b61d09---87521771411.pdfIn PDF document text
    • http://clevio.biz/fckUpload/file/tetiwabezezodebaw.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/katubazaredubazobuzaj.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/28852798455.pdfIn PDF document text
    • https://12tiga.com/contents/files/nasatureton.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210904_C907CCE29F13A97F.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/tagasitadi.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/67852029926.pdfIn PDF document text
    • https://madeirashopping.com/userfiles/file/tinami.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_off0000db1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1B 11144 bytes
SHA-256: 32a98513cb372b352e2b300a1b32951f4a410d0e2738a48bc3b8eb99fed7e152
font_01_sfnt_off0000f4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CC 18984 bytes
SHA-256: 1b6c936bf5247793142198a0bac644116d9c7ffb7e0fabf4fc45a6bc7800f515
font_02_sfnt_off000125d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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