Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e5a79c8c6ab5efb…

MALICIOUS

PDF

76.3 KB Created: 2021-09-16 08:47:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 665ae2a66f096bbba147f3a5f078187f SHA-1: 4bf2127c4a4d2cc49f16b4a3dba283988b2578c3 SHA-256: 0e5a79c8c6ab5efba9dbdb9701630d2fef9b82c309ef910fe99f896f70155df6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs pointing to disposable hosting, suggesting an attempt to redirect users to download malicious content or engage in phishing. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links on potentially untrusted domains, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://ketchas.ru/uplcv?utm_term=assassin+creed+identity+apk+obb+download
    • https://agrimal.pl/userfiles/file/45994576162.pdf
    • https://eletroluz-al.com/_IMG/img_internas/file/razisefisadipolokuvuw.pdf
    • http://abwplazaview.com/uploads/files/95344853700.pdf
    • http://aimic.com/userfiles/file/87273910175.pdf
    • http://laibros.com/ckeditor/userfiles/files/sonaziximekini.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/f217e730338c35db9d6f137a4c5ac419/81173209264.pdf
    • http://telecycling.org/files/file/bisanarerul.pdf
    • http://brandiassociati.it/userfiles/file/neladatelewevilesuro.pdf
    • http://jingmingtai.com/filespath/files/20210912211929.pdf
    • http://dydlhx.com/upfiles/file///88504375105.pdf
    • http://nyitotthetvege.kastelyszallodak.hu/userfiles/files/zidilopet.pdf
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/28376322292.pdf
    • http://kripasec.com/userfiles/file/2523529933.pdf
    • http://brilspa.ro/userfiles/file///lazatirojifodufejudavepo.pdf
    • https://jordanadams.com/ckfinder/userfiles/files/bifigigim.pdf
    • http://casadiriposomarsala.it/userfiles/files/kumewodosirizowopoxikupo.pdf
    • http://cascad-trans.ru/files/80746549767.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613032db69ff2---mitorujuwilovap.pdf
    • http://progetec.org/userfiles/files/nixinirokaridamexokama.pdf
    • http://premiercontainerlines.com/media/ftp/file/56847635245.pdf
    • https://kindeeyudee.com/ck_files/files/22198946414.pdf
    • http://dubilex.com/userfiles/files/38628291584.pdf
    • http://quaisetoiles.fr/img_pages/file/dixuvek.pdf
    • https://tectrongim.com/uploads/files/94658283292.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_off0000c52f.bin
dc7bc98c5545f6b725572fbd51c6c1440fa2eb14a047b3c2becc5c05d99cf5c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC52F 17240 bytes
font_01_sfnt_off0000f1e8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E8 16792 bytes
font_02_sfnt_off000109ff.bin
9505de3487a23eb051ef650bd98d4fdddccbf717bd5deca0d45158265710f1a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109FF 10920 bytes

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