Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c334ebd0828f4f9…

MALICIOUS

PDF

82.0 KB Created: 2021-09-15 15:13:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 044f71c42238554611481b841fc317c7 SHA-1: 8ba75d65a09af52ffda0e5de3e5fa10a34bb34e1 SHA-256: 6c334ebd0828f4f956c0063f06fbba1868cd77861c3d31e27093e63510f2b18f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, a common tactic for distributing malware or conducting phishing campaigns. While no scripts were explicitly extracted, the presence of numerous external URIs suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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 http://studioassociatoemc.com/userfiles/files/tixefiparudoruwuwefuzeda.pdf In PDF document text
    • http://www.findvoters.com/userfiles/file/negaxabo.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/19086558751.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/jutisux.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/92527734457.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/57955569023.pdfIn PDF document text
    • https://gogreenonline.net/userfiles/image/fckeditor/file/58094797373.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/babepiliwugefuluteputomas.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/21065013901.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/wewimago.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613956edd33f3---92172807289.pdfIn PDF document text
    • http://fruitsad.pl/images/file/nuvemaforodojadavi.pdfIn PDF document text
    • https://recrut.com/files/files/nupuw.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/juvosix.pdfIn PDF document text
    • https://atrax.eu/userfiles/file/97793461837.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/divukudegopevakulodasi.pdfIn PDF document text
    • https://paulogomeslda.com/userfiles/file/70739998297.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/matiki.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/udfo608n67dt1qavjkrkqs5t26/95932521995.pdfIn PDF document text
    • http://photonart.nl/phpcmsys/file/nomezonogapaz.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/wunubilomanezumi.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/wuwanilam.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/79815113983.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/3484737256.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/23642480165.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=best+free+music+download+app+for+iphonePDF 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_off0000db54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB54 17256 bytes
SHA-256: 280501292edd3be60decef82bfcc30de1894912abad7ee524a71d2aa0fc84ad0
font_01_sfnt_off000107dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF3 11124 bytes
SHA-256: 49564d41bef8e0ea2180cc201180fa5f2159d8369b997f7185fe5c3576aa027f

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