Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b6f9f219f67069f…

MALICIOUS

PDF

81.9 KB Created: 2021-09-16 15:35:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d04c2b099625f3154c2700526d75f88b SHA-1: c6037dea3e01cab5b4b0012fb89d2537705ac866 SHA-256: 1b6f9f219f67069f20c498603b312f51ad7edf7975ec210b5155b3b5155cd0f7
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. ClamAV and ML classifiers identified this file as malicious, specifically a phishing trojan. The embedded JavaScript likely redirects the user to one of the numerous external URLs found in the document, which are often used to host phishing pages or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • 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://www.bankkartya.hu/js/ckfinder/userfiles/files/46601990935.pdf In PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef3aeba96c---27732956291.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/doguzozedupe.pdfIn PDF document text
    • http://klhl.com/userfiles/file/duvix.pdfIn PDF document text
    • http://celesteandtorsten.wedding/images/file/tojafepawasexa.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/80121422357.pdfIn PDF document text
    • https://rajaunited.com/contents/files/kexibosana.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/tefizojojegebot.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/letuzusifopijoredili.pdfIn PDF document text
    • http://king-ber.com/UploadFiles/file/20210912203104254.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///61366042902.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/71585712614.pdfIn PDF document text
    • http://stylekd.ru/files/27414070711.pdfIn PDF document text
    • http://palami.by/images/file/81534258374.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/13560525101.pdfIn PDF document text
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/60284455184.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/jasakikikubataditavedit.pdfIn PDF document text
    • https://ud-hobby.com/images/Upload/file/pulikazoledadipotufikut.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/bunuwedivigekifofapoxupo.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/vewavunedufubibuniruje.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/55770445337.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/vegerobexiwazijagezulekux.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/59621375421.pdfIn PDF document text
    • https://atavio.ru/files/file/kogibizukilesewaxej.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/32936148257.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=best+gfx+tool+for+ffPDF link annotation
    • 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_off0000db09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB09 18168 bytes
SHA-256: b2d31c9be19c5dd6e6fbe20be318560edcc787ed93f3e44abad398c9c1190fd3
font_01_sfnt_off00010b38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B38 10188 bytes
SHA-256: c81854ccd7f421af960379481c7073607de3f84f118e994021c0b3cffd2545ce
font_02_sfnt_off00012243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12243 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1