Malicious PDF — malware analysis report

Static analysis result for SHA-256 9677fe4a0c68f8b4…

MALICIOUS

PDF

96.0 KB Created: 2021-09-21 18:02:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b9da88814d59fda322c02b0a6e3f10a5 SHA-1: 3fd9dc51885edb677d8868707e2ee869208df2bb SHA-256: 9677fe4a0c68f8b449cf3d7e154051ae67421eb034da4b3438d32a1d9e1b6667
134 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. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The presence of numerous external links, many pointing to potentially disposable domains, further supports a phishing or link-farming attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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 http://thedewakohchang.com/image/upload/File/2654572586.pdf
    • http://daglichtfilters.nl/ckfinder/userfiles/files/jinifalivuvekevuvowelitog.pdf
    • https://mancomunidadvaldizarbe.com/userfiles/files/regomeponujezakejowav.pdf
    • http://parvazyab.net/basefile/api203/files/xipewasigezojewepixi.pdf
    • http://only-svet.ru/upload/files/jutebilesafilijigina.pdf
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/xisizolitobed.pdf
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/16599400285.pdf
    • http://szzxwx.com/Upload/Upload/file/202191746189310.pdf
    • http://ogledalata.bg/uploads/pages/files/16948229335.pdf
    • https://reniuved.it/file/wozabivepemiji.pdf
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d5358a3f6---78822677495.pdf
    • http://studiotravenzolo.it/userfiles/files/matuf.pdf
    • http://lnianemarzenie.pl/userfiles/file/73713231210.pdf
    • http://mariautonoleggiomarsala.it/userfiles/files/gazuvumaduvul.pdf
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/rowedajisixenutifenuzajuz.pdf
    • http://ryyw.com/upload/files/2021/09/202109191624133601.pdf
    • http://veraschwemmle.de/fckdata/file/65304370051.pdf
    • https://marblobathware.com/app/webroot/img/files/74467541630.pdf
    • http://finpacecuador.com/userfiles/file/45615655490.pdf
    • http://vizugy.hu/uploads/files/files/nogonugoxomepegu.pdf
    • http://drsuthichai.com/userfiles/files/tijajilowoxurut.pdf
    • https://vr-spagna-20.effievirtual.com/galeria/files/wesutupuzafexedobukakine.pdf
    • http://mtjjt.com/2013/upload/article/files/21090315293580470667moo.pdf
    • http://jessie.vn/images/ckeditor/files/34024950229.pdf
    • http://iiiemjobs.com/FCK_Editor_Images/files/jivufijumubasimolado.pdf
    • http://www.cddfct.com/up_files/file/12952449019.pdf
    • http://heroaca-movie
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=bnha+hero+rising+full+movie
    • 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_off00010506.bin
d1b1576dfa5e3ccca39474f3a5d7a11e1e2a53a3ee8033c721578ba01f598c33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10506 22900 bytes
font_01_sfnt_off000141b1.bin
489c4c603cbda65085ba11d7ee26c7066d3178b1f2c46e57ffdbf8733695d78c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x141B1 10780 bytes
font_02_sfnt_off00015a55.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15A55 16792 bytes

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