Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8323c1c45756c17…

MALICIOUS

PDF

69.5 KB Created: 2021-09-25 09:46:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 44f34437bf602f7cc240cd05da658ba9 SHA-1: 20dd8ef31048dfa78578fa5a7a06fbc6daf8c2d5 SHA-256: d8323c1c45756c17141b95c3aee43edd36a247f526df6fc836a8276d764fa885
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. Multiple external URIs were found, with many pointing to unknown domains, suggesting a link farm or phishing infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://jtg-antracyt.pl/files/file/navefawuwagagofixozifo.pdf
    • https://krzczonowice.pl/gfx/file/rokemiv.pdf
    • http://oasis-inwaste.asia/files/file/tilup.pdf
    • http://eko-inwest.eu/upload/file/xefobudilu.pdf
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/vukupojuzalowejibuj.pdf
    • http://ilturismoinitalia.it/userfiles/files/naperur.pdf
    • http://studiostocchi.eu/userfiles/files/95364997473.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135064ed2e65---83258459237.pdf
    • http://xn--h1acbpobggs.xn--p1ai/data/files/porewafodazokug.pdf
    • http://m-styleauto.com/js/upload/files/tajuvuguxoz.pdf
    • http://mhzsolutionz.com/userfiles/file/wipuz.pdf
    • http://currycornersugarland.com/admin/images/file/vuxusasesodudizijol.pdf
    • https://5974293.pasarantogel.com/contents/files/17070738027.pdf
    • https://snowcat.pl/admin/ckfinder/userfiles/files/91191146798.pdf
    • http://thietbiotoviet.com/Images_upload/files/78628762628.pdf
    • https://allianztc.ro/files/file/mivukapifemagu.pdf
    • http://saaretravel.ee/images/file/87722131617.pdf
    • http://ayrh.internet-match.com/upload/files/24797191559.pdf
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/45632831326.pdf
    • https://chungangroup.com/uploads/files/202109131723058357.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/64a3707723477c6d4fcd400c0dff70cc/59217321173.pdf
    • https://casabresciani.it/uploads/file/40988264216.pdf
    • http://biblioteka-belzec.pl/upload/files/sekefolesapaxosufofaxefa.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=real+estate+agent+offer+letter
    • 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_off0000b149.bin
5d23ab83793a1dd6737d31a7bcfaf2de80dcb463221616b26dfbd873715aa8a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB149 15532 bytes
font_01_sfnt_off0000d8dc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DC 16792 bytes
font_02_sfnt_off0000f0f3.bin
4e01034adda0343030ec8853d9315c127fe32b6d8442031c911a6691ef7012f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F3 10340 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.