Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcd5f4e72a5c2869…

MALICIOUS

PDF

79.5 KB Created: 2021-09-16 22:49:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dad1d466dbd85270c79a5a97ba558503 SHA-1: 06247118a2b06fdaaef5e1e360df75f5c14f76ca SHA-256: fcd5f4e72a5c2869a049c8f172675bb2d2dec2625297c2538185fce601404191
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://lokalsport.no/userfiles/file/76661416292.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/5708fbb3c24f3770ef9e51d2f49ad1a3/36103033130.pdf
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/kodotadiduzadenipeje.pdf
    • https://xtrafitcoaching.com/www/images/files/kulajitif.pdf
    • http://linza-market.ru/upload/files/2261370214.pdf
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/98875831103.pdf
    • http://gbfrjournal.org/pds/userfiles/files/tolexarakedezumisejufo.pdf
    • http://www.santamyoga.be/images/file/sokegunemujisexuxonepuwed.pdf
    • http://minerva-collection.net/files/files/tatoxevefoxijomad.pdf
    • http://diakmelo.hu/ckfinder/userfiles/files/25515358232.pdf
    • http://erimti.com/userfiles/file/zirijobozelidedenalari.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1614320f5c6b51---42924202087.pdf
    • http://www.alex-vasilkov.ru/images/wisdom/file/najojirewodezufur.pdf
    • http://engroupe.ca/aym_image/files/gutimosedewokasumobima.pdf
    • http://apart1day.ru/file/37167280388.pdf
    • http://xmst.com.vn/app/webroot/uploads/files/22862354222.pdf
    • http://bebelino.ru/userfiles/file/dureligawixib.pdf
    • http://dental-forum.ru/userfiles/file/96468219720.pdf
    • https://academiapreprod.riportico.com/userfiles/files/gusuduv.pdf
    • https://alixdemassy.fr/userfiles/file/67181652676.pdf
    • http://oasis-inwaste.asia/files/file/legubopimujifetuxiwuku.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/05952173b9ea2fbc9779cf527bf0e913/nakofitimiroli.pdf
    • http://vers-ma.de/userfiles/file/pisifetegebi.pdf
    • https://aarushimukhwas.idealviews.com/userfiles/files/76668925887.pdf
    • http://tiwtactic.com/userfiles/files/vitimubosopaxudu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=logo+esport+premium+mod+apk
    • 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_off0000d214.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD214 16792 bytes
font_01_sfnt_off0000ea26.bin
dc3cd10f4ebab854b0d2d20ee149646f1b60323d78cb7501f4c7fc3fc4c2aefb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA26 17584 bytes
font_02_sfnt_off000117c6.bin
e154de75c9f8250249cfa677d16c15af811a49c88cfe090795a9f63bb6adf7d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117C6 10736 bytes

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