Malicious PDF — malware analysis report

Static analysis result for SHA-256 c075c6e87da2420b…

MALICIOUS

PDF

79.0 KB Created: 2021-09-19 15:25:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7b4b5e55561a451a899eccc89c05c92c SHA-1: fdff7cc9d50c2b710fdb5623670b4b1d1e73c445 SHA-256: c075c6e87da2420bc299e23e92fb53fa854d4213cb4bafdb76f5a8fd7a6e76c0
94 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and the heuristic identifying it as a link farm on disposable hosting strongly suggest a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure itself facilitates the redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2513

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pixomot.ru/uplcv?utm_term=galaxy+s7+memo+app PDF link annotation
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210916131103.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210903/file/16306427313898.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/suwomep.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/januzuzizixopeminuz.pdfIn PDF document text
    • https://brs.jo/userfiles/files/nunanigujaludejemazogaves.pdfIn PDF document text
    • https://amgaa.org/temp/files/67808584020.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/48151758782.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/dixomoreripujor.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140d56b14f1f---28925202255.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/17295332174.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16134c0d18ed2a---jirapoxewogoja.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/genujarajaked.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mifagefaba.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/dutatemoxumod.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/9375487970.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614404c2bceaf---fujudagafuluzuwuj.pdfIn PDF document text
    • https://geniodelweb.com/file/84086431889.pdfIn PDF document text
    • http://mayingiabao.com/upload/files/89701674880.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/pixenidomatirivuva.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/64653958211.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/morovevedeledawiwuv.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/22560461266.pdfIn 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_off0000daed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FF 17516 bytes
SHA-256: 5e00ddad7dba69380e1d346b197a41b246bfd68a0f3581a47fc245b358ece5b3
font_02_sfnt_off0001204f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204F 10324 bytes
SHA-256: 98519b98acfab60b56569aa112e44e51925ac5a599d71b5d4eec67e01fc89ff7

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