Malicious PDF — malware analysis report

Static analysis result for SHA-256 16bf8be30477a1ab…

MALICIOUS

PDF

63.7 KB Created: 2021-09-14 05:19:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 97f1f3846adc43e402e9ea956a22c5b5 SHA-1: 9a60dd5ec0ffd0545baf2b47c0189da4c6cca732 SHA-256: 16bf8be30477a1abd4dc380db8764e358b5de7847dfdadf8ed015d0d26771bb0
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also features a large number of links, many of which are on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content or phishing sites. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7270

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://sinsg.com/files/fckeditor/file/97159809337.pdf In PDF document text
    • http://www.zywawiara.pl/pliki/52745336524.pdfIn PDF document text
    • https://braus.uz/images/shared/file/jokiza.pdfIn PDF document text
    • http://tuvantindat.com/uploads/2021-09-09/images/files/gumugazodegusafap.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161386b788f483---lozosimokibubobikozotogak.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1612f563af3fd7---66061321626.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021091006181073499.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/11506723705.pdfIn PDF document text
    • http://ipayon.com/root/FCKeditor/file/74980641191.pdfIn PDF document text
    • http://lactopad.com/uploads/files/94401794983.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/mosebokufuvofepi.pdfIn PDF document text
    • https://projekt-lesen.de/userfiles/file/movurawawerofunodopuka.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/gepimixumuwenapu.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/pufiwofurijezeja.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/45308815678.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/36277614846.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/vofotonijoketiwetav.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/34510809038.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/45260063173.pdfIn PDF document text
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/liwixit.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/vefureziwizirure.pdfIn PDF document text
    • https://pracowniatechart.pl/fckpliki/file/7868961400.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/2485631471.pdfIn PDF document text
    • http://toyotaprius-custom.com/js/upload/files/gabarefawemobi.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/dotawadipenevoruvegas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=idm+crack+6.38PDF 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_off0000e70b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70B 10428 bytes
SHA-256: 1ebb0850b0575fcadace951a00f820fc46863d80daa612e5bf1b92d9a4a47dc4

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