Malicious PDF — malware analysis report

Static analysis result for SHA-256 580dead75824c7f3…

MALICIOUS

PDF

90.0 KB Created: 2021-09-16 18:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e2e9447b63f80838566267c6be891699 SHA-1: 6ba2ec7f1cbf159d4c1b2fcf1211bc586c88feb8 SHA-256: 580dead75824c7f30c1929f817044cefdaa22dc8c18de1f9b2f2444e20c61152
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by multiple heuristics, including a link farm detection and a high-confidence ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains, suggests a phishing or malware distribution scheme. The ClamAV detection further supports its classification as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 https://sahodayabbsr.com/test/fckeditor/file/56363676933.pdf
    • http://inarchengineering.it/userfiles/files/71019710353.pdf
    • http://biznesfishki.ru/files/userfiles/files/sikiridobibazeso.pdf
    • https://asiquim.com/ckfinder/userfiles/files/4297203482.pdf
    • https://mimzyonline.com/userfiles/file/gabegobuzefufane.pdf
    • http://perilatomsk.ru/ckfinder/userfiles/files/4606052994.pdf
    • https://actorconseil.com/files/file/xutunumotif.pdf
    • https://brahmagnanam.org/fck_uploads/file/sejobe.pdf
    • https://weyergans-hcc.lv/userfiles/file/64647095552.pdf
    • http://csc0871.com/userfiles/file/20210916182930_cc9h83.pdf
    • http://playitdirect.ca/ckfinder/uploadfiles/files/61529527317.pdf
    • http://icaalliance.org/filespath/files/20210912104338.pdf
    • http://aexpress.lv/index/images/up/file/80499229381.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134af3f0acc2---84497351613.pdf
    • http://agrobud.net/uploaded/file/mazani.pdf
    • http://dylogistics.com/userData/board/file/dadipalikalogigozanujojiw.pdf
    • https://tckontrola.hr/files/18075824596.pdf
    • http://cathugo-catamarans.de/res/wysiwyg/file/56697072656.pdf
    • https://manhalhealing.com/userfiles/file/diborabenoberevisudubej.pdf
    • http://m-s-g.ru/userfiles/files/14332220750.pdf
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/87079271875.pdf
    • http://interreg-ipa-husrb.com/downloads/36144134181.pdf
    • http://artdealer.vn/upload/fckimagesfile/4f38b38eb9b3fd01604029ca3a22a0e0.pdf
    • http://decom.pro/admin/ckfinder/userfiles/files/zumodanikigorajumo.pdf
    • https://nikosdimos.gr/userfiles/file/74278885099.pdf
    • https://axlthailand.com/imagexx/files/nawogunotufekanisa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=wildcat+generator+fortnite
    • 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_off0000fc29.bin
9659bd6a754c4b804b8d449fecd5c469a7853e862487a5644c69c3ae9eccf24f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC29 17756 bytes
font_01_sfnt_off00012a72.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A72 16792 bytes
font_02_sfnt_off00014289.bin
b76d90610e6098fcf91cca738819c8f93e2868f7cc106f77cdd7155f2654b898		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14289 10476 bytes

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