Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6648a97253b95c3…

MALICIOUS

PDF

62.3 KB Created: 2021-09-23 12:23:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: aa70302f790fc4e88e78cb7bee07ac78 SHA-1: 9fa122c7f7415247208438063343222719c17d9a SHA-256: b6648a97253b95c3a8272c6713ccddf45628cf975be3c08ba161d2360c6b6f27
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded links, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. One notable URL, https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=wps+connect+android+download, suggests a lure related to downloading software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7260

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://www.institutvzdelavani.cz/files/dipafixu.pdf In PDF document text
    • https://jingchengs.com/jingchengs/ckfinder/files/20210904104329.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/86379622193.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/60761396172.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b7520bd2e---70666696005.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/kideporapukidodibegem.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/pubisufanofixeguvo.pdfIn PDF document text
    • http://thcsnguyenvanhuyen.hoaiduc.edu.vn/ckfinder/userfiles/files/lumijumakapetone.pdfIn PDF document text
    • http://katachizu.com/img/news/files/89695576676.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/1715211878.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/saromobid.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/woxax.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/labalitalujirasodagivote.pdfIn PDF document text
    • https://dd-inside.de/userfile/file/paguwezikoko.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/90642380531.pdfIn PDF document text
    • http://cwpni.com/userData/ebizro_board/file/lumerimanugunuj.pdfIn PDF document text
    • http://denge.aero/upload/files/lopokeninil.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/39809835385.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/13572542513.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/wefifaranumivatekepofili.pdfIn PDF document text
    • https://paulogomeslda.com/userfiles/file/lisirexi.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/81141501463.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/80423218311.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/54967244196.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/mekole.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=wps+connect+android+downloadPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC797 18056 bytes
SHA-256: a6606f1a2dedf7b266ad1433812926e0364296a1f0e9df4180a408897b2283a4

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