Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad980deb3f26bfad…

MALICIOUS

PDF

70.1 KB Created: 2021-09-26 20:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e0ad57aa9ff5085045bd9f6bc1443e48 SHA-1: f51bd736b020923b692aa2440546e08240c2da9f SHA-256: ad980deb3f26bfad419695a2982f72acc08ab6b0ae378cd7ad66ff65244dfb87
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://synerhu.ru/uplcv?utm_term=data+mining+practical+machine+learning+tools+and+techniques+4th+pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614e24dca79c8---33049686856.pdf
    • http://tiga.co.th/ckfinder/userfiles/files/36928632442.pdf
    • https://duongthuy.net/userfiles/file/49777927411.pdf
    • http://stoka-saarlouis.de/userfiles/file/58508658556.pdf
    • https://fontaine-eva.fr/userfiles/files/kojewopufizawos.pdf
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/fotazuzelesagimov.pdf
    • https://csn-alliance.com/data/files/mejoxapijaku.pdf
    • http://showpalmedical.com/userfiles/befojurasebulasabileg.pdf
    • http://suachuaspa.com/upload/images-content/files/sikufus.pdf
    • http://fittbikese.hu/files/file/sotuxedemuwigelipisinades.pdf
    • https://pracowniatechart.pl/fckpliki/file/puwetoxixawoj.pdf
    • https://bustotoronto.com/userfiles/file/fejarikadixodibok.pdf
    • https://aglogistics-bo.net/userfiles/file/dojofedewimefuvenuwitix.pdf
    • http://robedecreateur.com/img/files/venipemovabafukomelaxo.pdf
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/25374155880.pdf
    • http://dpsnowodworze.pl/userfiles/file/lemafedijodasojapumujom.pdf
    • http://evergladesharvesting.com/ckfinder/userfiles/files/2561502172.pdf
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/polexonev.pdf
    • http://nova-auto.com/upload/65366264245.pdf
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/26872947236.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af64.bin
0bb5c3f7eeceee73c66bb40b122be212263d9553b0636ff10f4000f356da9e70		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF64 15888 bytes
font_01_sfnt_off0000d7fb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FB 16792 bytes
font_02_sfnt_off0000f012.bin
db6b8f12ae832f65f8cb274ffd58fc50ab1ba621e2f005c1f1c23884367f99f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF012 11392 bytes

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