Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e22e7511b8d310d…

MALICIOUS

PDF

78.8 KB Created: 2021-09-20 03:26:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 888a2f78ccf8104e4b74b30942ce0580 SHA-1: 8b95906f441c0ba0dc3852cb07282517b3646bc3 SHA-256: 3e22e7511b8d310d131805450e90b0ce8f8ce380c27e96010537cb1370d23425
134 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 PDF files hosted on potentially disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a link farm designed to obscure malicious content. ClamAV detection further confirms its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6181

Heuristics 6

  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://vico-real-estate.com/ckfinder/userfiles/files/63732795100.pdf In PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/44260370178.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613aaaa1345b3---xozumedikewowugi.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/d984bdffad3518072b462650eb95d629/15539909884.pdfIn PDF document text
    • https://propage.q-cloud.net/upload/ckeditor/pages/files/kudapox.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/61203309819.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/lokutiguvuvipavarezimafo.pdfIn PDF document text
    • http://konberdbio.com/upload/files/vigemosewevaxut.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/jejoluzajerululo.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/xejodajimalekorefikawuz.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/88415972664.pdfIn PDF document text
    • http://cistenivytahu.cz/upload/file/80564342870.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/lepagifebenaradudopegadu.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/28501921126.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/40387206183.pdfIn PDF document text
    • http://hk-keber.de/images/file/58252135089.pdfIn PDF document text
    • http://directopinion.biz/uploads/FCK_files/file/sesirudapiridifakowipir.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/49818901349.pdfIn PDF document text
    • http://beijingteye.com/upload/files/59301324967.pdfIn PDF document text
    • https://biocoils.com/img/file/kawefevabuxawev.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109120624189963.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/zeveji.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/roxewuzenamemupubiwu.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/18018609754.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=android+2.3+launcherPDF link annotation
    • 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_off0000d7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB8 10640 bytes
SHA-256: 6a55e8a9cb47c89b490f4fd40f96d5c01baad9b0046565ad9cee38e646ff084e
font_02_sfnt_off00010804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10804 19132 bytes
SHA-256: 6b2e28bf84ad2e2f1e63ef75d69c2235d5aebce70da1e9dbf82da0ad71115915

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