Malicious PDF — malware analysis report

Static analysis result for SHA-256 595f967d59494f0f…

MALICIOUS

PDF

84.4 KB Created: 2021-09-18 21:45:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 84fe92d8ae5b37a8b675392821be4e18 SHA-1: b9310f9c61eeedac59ca2d057a10cb5507f590cb SHA-256: 595f967d59494f0f356e0424f3daed1d5392143714d2ea556152fb780e074779
142 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external links, including one identified as a link farm on disposable hosting, suggests an attempt to redirect users to malicious content or download further payloads. The heuristic for a visual download button further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://sxhk365.com/uploads/file///41925053370.pdf
    • https://madspot.dk/ckfinder/userfiles/files/ralepumedik.pdf
    • https://napraforgohotel.hu/upload/file/mapotafuwosumasufat.pdf
    • http://miydz.com/mingyi/images/userfiles/file/93527473600.pdf
    • http://arniuniversity.in/ci/userfiles/files/53627694680.pdf
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210911201519754250llnxk9.pdf
    • http://infrabud.eu/fckpliki/file/sudotusudumogade.pdf
    • https://alarrabnews.com/images/content/content/file/bidojubudumuviveped.pdf
    • https://vico-domrep.com/ckfinder/userfiles/files/32540972299.pdf
    • https://taperagi.com/contents/files/5470082169.pdf
    • http://borneneskontor-landsforening.dk/userfiles/file/72900955877.pdf
    • http://cybernet-ap.com/UserFiles/File/dafafakinarurogore.pdf
    • http://bananamusic.tw/uploads/files/202109060549127783.pdf
    • http://studiomarcheluzzo.it/userfiles/files/jewulujeru.pdf
    • https://laznia-radom.pl/userfiles/file/82707558062.pdf
    • https://dortmundpools.com/contents/files/polegelizobajilu.pdf
    • http://linyuepharm.com/upload/files/28346542359.pdf
    • http://vilocom.net/webroot/img/files/16197292515.pdf
    • http://www.sudaff.com/pics/file/mevexoboratu.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/7651eb0bcba731829c4ed1dd7ab100ce/7850974018.pdf
    • https://fivetc.net/uploads/files/15380389595.pdf
    • http://headrepublic.pl/images/files/jexevifumedeba.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16146262d90379---49969495687.pdf
    • https://b2cexpressdemo.com/userfiles/file/gamiwegas.pdf
    • http://usarsenal.it/userfiles/files/40948189340.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=football+manager+handheld+2017+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_off0000e413.bin
46dbfa8e2af6345c52884ba22bb4488fddeea21a694ea8e2b6070baa64a22fc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE413 17704 bytes
font_01_sfnt_off000111f3.bin
333e13ce0d27c512374df95bff4efd3a6d75a005359649f1bace138d8e66c61e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111F3 11132 bytes
font_02_sfnt_off00012b6b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6B 16792 bytes

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