Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a217703150c4a7b…

MALICIOUS

PDF

86.7 KB Created: 2021-09-15 17:36:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c63963318610cf1d0e1b9451d013bcec SHA-1: 8f49ac54b3827f58f9e2d8beae8432cac2d213b7 SHA-256: 4a217703150c4a7b1f8580cae1fb49694e495ad86b51c7bc4fd3b3abc00fb549
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism to host malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • 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.
  • 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://zae.me/datafiles/file/83531233439.pdf
    • http://electriccityusa.com/images/fck_uploads/file/75252402120.pdf
    • http://metabolitplus.ru/files/file/58753146611.pdf
    • https://franciscovalles.comtraining.cl/userfiles/files/bubibesosug.pdf
    • http://waycreon.net/bhaskar/yii/upload/files/35560642966.pdf
    • https://rockeit.com/userfiles/file/sasexe.pdf
    • https://mcdelandes.ca/uploads/file/fadirofelavitowedimami.pdf
    • https://myclubowners.com/userfiles/files/kegelunoxunutesanexa.pdf
    • https://www.alugutader.fr/ckfinder/userfiles/files/foxetugitusotuwebiwe.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b94131c21a---28717095666.pdf
    • http://congchungnguyenlieu.vnpec.xyz/uploads/files/22550023033.pdf
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/mugetugalive.pdf
    • https://xn--90ah6akb9e.xn--p1ai/f/file/bezunewodarajidawiwipujep.pdf
    • https://pannonfinanz.eu/editor_up/48401727848.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/04hlhlpi02qt7oon4a9ub03bss/21781329503.pdf
    • https://afayl.com/userfiles/file/wixoxitarosetonel.pdf
    • http://whdhgs.com/uploads/file/20210901223807613.pdf
    • http://anm-av.de/uploads/files/34723666931.pdf
    • http://kotrackusa.com/fckedit_file/file///20210903_0_4_2.pdf
    • https://lajovisena.com/gallery/file/sutone.pdf
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/metekaxoxivol.pdf
    • http://uktohabbarijamalta.com/files/file/81000340985.pdf
    • http://avsa.org/sites/default/files/images/files/3887396915.pdf
    • https://s-h.cc/uploads/files/202108312107355777.pdf
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/besirevefufipira.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+get+free+minecoins+on+minecraft
    • 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_off0000eef9.bin
9eefb9c133cddc455f8aa0ffababea5afbfa0f8f80a9639681100f5ca2851722		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF9 17372 bytes
font_01_sfnt_off00011c26.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C26 16792 bytes
font_02_sfnt_off0001343d.bin
dc21246fc7a3457692028d5976abc98c788a4976dd9f9a29d023c9fdfd245467		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1343D 10712 bytes

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