Malicious PDF — malware analysis report

Static analysis result for SHA-256 79cba78db204f315…

MALICIOUS

PDF

75.7 KB Created: 2021-09-17 08:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 28b855780f62100903406a62bd27d41b SHA-1: 6c5f034b881794268c7d61a52095d042c49f0299 SHA-256: 79cba78db204f3150379ea17df9c62ebe40103426997480264ec27ba07374437
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://pactolous.hu/upload/file/pitulogu.pdf
    • https://alarouba.com/ckfinder/userfiles/files/muwiwujipomuravexupalonud.pdf
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/53516324477.pdf
    • http://etoprosto.ru/ckfinder/userfiles/files/84011836961.pdf
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/21754182938.pdf
    • http://kleinschaden-expert.de/userfiles/file/19524955837.pdf
    • http://stlukesfp.org/ckfinder/userfiles/files/68301885169.pdf
    • http://konditsionery-odincovo.ru/upload_picture/file/lejozijavusakinup.pdf
    • http://winhazel.com/indigo/ckfinder/userfiles/files/loviramukubewalujovom.pdf
    • http://www.huescalamagiaenfotos.com/userfiles/files/17162508532.pdf
    • https://duhocblueocean.vn/ckfinder/userfiles/files/19567649842.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16133582991bb2---bebij.pdf
    • https://pushtypathshala.com/demo/aims/files/images/files/sunasepepofuwunidos.pdf
    • http://ltpbetel.ro/userfiles/file/1185653867.pdf
    • http://robvancampen.nl/userfiles/file/sojigamigafuve.pdf
    • https://telewebmarketing.com/FCKeditor/file/87377869376.pdf
    • http://vinabomi.com/uploads/userfiles/file/wojatumufexewer.pdf
    • https://commonwealthsportsawards.com/userfiles/file/sifesawobibenuveta.pdf
    • https://ooobelkom.ru/ckfinder/userfiles/files/sisugobidoziwometo.pdf
    • http://uklearningnetwork.com/userfiles/file/mapuxufefedo.pdf
    • https://landtop.com/filespath/files/20210903000902.pdf
    • http://wingmanplanningdemo.com/userfiles/files/nuzovudivovubi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=secret+neighbor+apk+free
    • 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_off0000c7ac.bin
0940d2a0255e2eb13d2bb6e103e9dae813fa4a284da5bdb1b2949af238534d9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7AC 15960 bytes
font_01_sfnt_off0000f06e.bin
637a029dcf69eb8d189854e590e77688248c38973f237fb0cef3991981cd2a6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF06E 10852 bytes
font_02_sfnt_off0001093b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1093B 16792 bytes

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