Malicious PDF — malware analysis report

Static analysis result for SHA-256 304dae0c41a05f66…

MALICIOUS

PDF

84.0 KB Created: 2021-09-14 07:06:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5deb65ac03e8a8051c48c7fabadfba7d SHA-1: fe75918381f2a0ff34a1635c0fd245b4c60eb517 SHA-256: 304dae0c41a05f6614b5125cb837f52982bf67938c00ae76dcb714dd9e90b586
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript that triggers an external URI redirect. This redirect leads to a link farm hosted on disposable domains, which in turn hosts numerous other PDF files. This behavior is indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://smidgel.ru/uplcv?utm_term=apa+style+7th+edition+for+website PDF link annotation
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/wanokukitapomiwudif.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/ledisobigugok.pdfIn PDF document text
    • http://vina2002.com/uploads/files/xutafawipukerugimumit.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/lufolurikuluwig.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/voxajubuwin.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/80317116050.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/81012194669.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/88609630259.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/19990837459.pdfIn PDF document text
    • http://linza-market.ru/upload/files/41597801244.pdfIn PDF document text
    • http://cartopack.be/Images/file/48523901721.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/fcdeccf40850c4cb20f818305a65b5cd/xemisorutumenirutowirer.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/kikogapabezidap.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/nugajubufepategedowogo.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/mazepita.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/12416870156.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/lagaraxabe.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210901054406.pdfIn PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/vixigagepepegaje.pdfIn PDF document text
    • https://invision.buzyhub.com/files/vopuwepejuxuziwuru.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/51154627083.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/49010525748.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16137bad3e692c---34787750533.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/83479018992.pdfIn PDF document text
    • https://ojazzdance.fr/userfiles/file/pukizidexe.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000e13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF955 10968 bytes
SHA-256: a4acd83507a32109d9f2c2877f29136f2256d7dcef9d62a91b08f187c795b5bd
font_02_sfnt_off000112b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B2 18140 bytes
SHA-256: 186702210b68bc573540b38f00462e155df00f5c2ad27dbfb9862879b619ea70