Malicious PDF — malware analysis report

Static analysis result for SHA-256 8427479fd0e1f278…

MALICIOUS

PDF

70.8 KB Created: 2021-09-27 09:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 300a3433f189c63928ec4c6c0811efae SHA-1: 3273c194e71beceb4b4596c1d257dae8b4628957 SHA-256: 8427479fd0e1f278ecfd1a2447c052644f8f25d46d82de584ac6e0679913b456
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is flagged as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and embedded links point towards an attempt to direct users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://debnine.net/UserFiles/File/puvefuzu.pdf
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/faximevot.pdf
    • https://exam12.menapoint.com/app/webroot/upload/files/pazateweximefalixobubuxe.pdf
    • https://vpmemorial.net/images/file/badam.pdf
    • https://ka-base.no/images_students/files/17980468817.pdf
    • https://wic-net.com/userfiles/file/21790172682.pdf
    • https://amthanhanhsangchinhhang.vn/upload/files/xixepozarev.pdf
    • http://big-blue-bus.com/pics/fotos/1/file/gapoxefefiragoxopujog.pdf
    • http://getampedmag.com/ckfinder/userfiles/files/sosuzibunozugi.pdf
    • https://pspgenuine.com/ci/userfiles/files/pakodupitumasegipova.pdf
    • http://radio-salsa.fr/php/rs/filesupload/file/xatesaju.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/e74f68f5ea358cba755bf97d4b277372/xosuwepokufijijodip.pdf
    • http://omgmediatank.com/userfiles/files/berabebajejevutigadiwiza.pdf
    • http://mail-ex.net/userfiles/file/fejopumakupi.pdf
    • http://sangiorgioautoservizi.com/userfiles/files/pibevuxivokisol.pdf
    • https://contabil-fiscal.ro/mm/file/beroganonopozexakofobogup.pdf
    • http://ferrocom-spb.ru/userfiles/files/nusimesufikes.pdf
    • https://ijtm.in/userfiles/file/13434326320.pdf
    • http://daeryuhealthcare.com/ckupload/files/44305360319.pdf
    • http://laskod.hu/userfiles/file/73536847792.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eab8e0464d---rijuxusukikizagedonizur.pdf
    • http://minhledtran.com/luutru/files/bowaxomadenerizajaxo.pdf
    • https://satuldelut.ro/ckfinder/userfiles/files/nasakefisujoseji.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=hide+mock+location+app
    • 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_off0000b2df.bin
e4d054751a5f973d62d53f34ccc616266a875378cae0be05c6cf55a1a9de527b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2DF 10488 bytes
font_01_sfnt_off0000ca96.bin
68e9b87b4ca89b321068e095c7b4fbfe52afa47fd0a93298ddb3f2147ca08335		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA96 16892 bytes
font_02_sfnt_off0000f625.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF625 16792 bytes

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