Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7e6324e19a843a5…

MALICIOUS

PDF

60.9 KB Created: 2021-09-29 03:23:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 02d0368b9f2efdfdd4e4eae5c956cd14 SHA-1: f92da24498d1636fad64a36f66a20cfecf16d5d7 SHA-256: b7e6324e19a843a558eb9a98985ab952e1eb755f63f2ab34e1610feaab5f899c
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to a link farm hosted on disposable domains. The ClamAV detection and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection to these malicious links.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4242

Heuristics 5

  • 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.
  • 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
  • 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://www.bluewhaleline.com/image/upload/File/fukamekopetifavulasu.pdf In PDF document text
    • https://moveo-sport.pl/userfiles/file/molowiwawilegimi.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/84672615761.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/rapazu.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/jaxuzolaxa.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/repivupitul.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/lategadozuzuwutodizipumu.pdfIn PDF document text
    • http://jubangh.com/Upload/FckUpload/20210902file///sapozusupifixarufevasedo.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021091410373173499.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/zurimak.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/37851539062.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/30005819170bfd3c34e4257eb21d2333/71636489455.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/26215022067.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/37151271325.pdfIn PDF document text
    • http://darstin.com/userfiles/files/37487662525.pdfIn PDF document text
    • https://angkagenap.com/contents/files/25375101170.pdfIn PDF document text
    • http://sokole-tps.pl/userfiles/file/mivolunosinajiruvofi.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/47226487251.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/tiziwabupunum.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/75415712961.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/19163813347.pdfIn PDF document text
    • https://vicareyou.com/userfiles/file/menugu.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/katilanigekapemapivot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=telecharger+dernier+version+androidPDF 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_off0000b28a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB28A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000caa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA1 10580 bytes
SHA-256: 3c1eb633194f90401e597110cd5ca28bf47d78fcab68804eeccd88dbd193493c

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