Malicious PDF — malware analysis report

Static analysis result for SHA-256 5588fea77b09ae54…

MALICIOUS

PDF

79.7 KB Created: 2021-10-06 13:29:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0f7c3d048705c1c3c9cc5a9d22fec32d SHA-1: 40b335e434889c5458371d15d063e51eff0ed943 SHA-256: 5588fea77b09ae548cb2507d0e776830422167aad7f1987abee487fae0f8d496
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to disposable domains or link farms, suggesting a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high volume of links on potentially untrusted hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6111

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://vom-ragnaroek.de/uploads/file/26435305097.pdf In PDF document text
    • https://cplastik.com/data/cms/file/98536596334.pdfIn PDF document text
    • http://baoveantam.info/upload/files/januvukevige.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/21408054464.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/fixarigovegiwuxixon.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-10-3/20211003011606843175.pdfIn PDF document text
    • http://mylodge-naoshima.com/metuwegerupitemamekudunuk.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/kevujitusiribimipov.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/15067097085.pdfIn PDF document text
    • http://topbuild.net/content/xuploadimages/file/40869727504.pdfIn PDF document text
    • http://ozdermusavirlik.net/userfiles/file/78731904874.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/sumanesezig.pdfIn PDF document text
    • http://farmina.ru/uploads/files/39299782711.pdfIn PDF document text
    • http://moretonassets.net/userfiles/55448543952.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150a382884ca---87431366758.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/xoredufibaxiwoxaxawuma.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16150cb369d525---gowukagasisatako.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/86854381943.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/90130845763.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20211006072710.pdfIn PDF document text
    • https://sharks-cz.cz/images/file/vimeg.pdfIn PDF document text
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/89564290055.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/sorusarijebev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=drop+that+meaningPDF 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_off0000fd89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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