Malicious PDF — malware analysis report

Static analysis result for SHA-256 cac468e830be6df7…

MALICIOUS

PDF

87.3 KB Created: 2021-09-10 01:02:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5013fb2a3cf290b0e4e13ff1d807ef59 SHA-1: a9572091c46acf22bc1f423bc37063b00f76f863 SHA-256: cac468e830be6df707ced14e82a43972cb515838582834484a17383132519612
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of external links, many of which point to disposable domains or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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
  • 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://catamma.ru/uplcv?utm_term=chapter+3+methodology+example PDF link annotation
    • https://uzsienis.cvzona.lt/resources/img/files/zobotawaseverovog.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/10214031299.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/kaposolaw.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/mabamevawivaxofusiwowa.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///zurobogojivomigavinizo.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/pipisarifuno.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/nutexomog.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/gepiwaregivejelazavivipav.pdfIn PDF document text
    • https://china-glass-mosaic.vegner.com/userfiles/files/20210905_001557.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131404e952e6---potejidabukosamofulenozoz.pdfIn PDF document text
    • https://ezokniga.com/uploads/file/bejonobametivodanu.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/55350534647.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/juvejiraziwirisezije.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356a9ed0c67---34377326346.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/91925968793.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202109072336382746.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/92990212775.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/lugitararizu.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/ruvafevegi.pdfIn PDF document text
    • http://itcbeautytrainingschool.com/userfiles/file/94777804052.pdfIn PDF document text
    • http://xn--b1agpbmdtf.xn--p1ai/upload/file/menoresuwubaki.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0C 18800 bytes
SHA-256: 1366dab0e6864848604c47c49aee36c557064a23204e0fd6d4572fca678d6ba6
font_01_sfnt_off00011ecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECB 10892 bytes
SHA-256: ccd3fb0f4fe86637bc39be51bd49991f6813c7652395701af6ca588e7df287bb
font_02_sfnt_off000137de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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