Malicious PDF — malware analysis report

Static analysis result for SHA-256 b73233546588e604…

MALICIOUS

PDF

82.9 KB Created: 2021-09-17 01:34:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2fca2aed10dc6d8eebe603bb455b9e9b SHA-1: 8de45436ba74095521909661f3f7452fefb971fa SHA-256: b73233546588e6041d5b0b93df45eb7d89a5eb3af8322a769f66d504960bdc50
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and a heuristic identified it as a link farm. ClamAV and ML classifiers also flagged it as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an intent to redirect the user to potentially malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://gocoachfox.com/userfiles/file/43402963607.pdf
    • http://duda-tech.pl/dudatech/upload/file/fojinuriwi.pdf
    • http://itcbeautytrainingschool.com/userfiles/file/japanad.pdf
    • http://sumosushingrill.com/uploads/files/75002689407.pdf
    • https://icoachyou.biz/images/ckeditor/files/rojoxapagujafifomiz.pdf
    • https://weekendtripskolkata.com/userfiles/file/muxuleno.pdf
    • http://contelex.it/userfiles/files/57880814402.pdf
    • https://idd.no/ckfinder/userfiles/files/10558138210.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8cbf8cb05---96292723682.pdf
    • http://conelser.hu/fck_uploads/file/95362925517.pdf
    • http://steffis-strassladen.de/userfiles/file/4233300775.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/9ng8tgnv5iff111mgsgtobdil7/42305520437.pdf
    • https://carpenterstouchnj.supremeroi.com/FCKeditor/file/fulasapobaxekogejodajone.pdf
    • http://k12kos.com/ckfinder/userfiles/files/fekifo.pdf
    • https://marblo.ph/app/webroot/img/files/xorumujod.pdf
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/titusotowobelatafo.pdf
    • http://80tner.netsociality.com/upload/files/fapaja.pdf
    • https://frisch.ro/files/file/50417844810.pdf
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/42323852799.pdf
    • https://praktijk-fix.nl/userfiles/image/file/30933132611.pdf
    • http://imreelectric.sk/uploads/file/91209268457.pdf
    • https://deycaterers.com/ckfinder/userfiles/files/66013830440.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=set+up+mms+on+android
    • 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_off0000e049.bin
638aec6cb60d498afa121ec8e3b1756f03a36b6d25761b5b97bf813a600aa9f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE049 10680 bytes
font_01_sfnt_off0000f8be.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BE 16792 bytes
font_02_sfnt_off000110d0.bin
031fcd78b6bdac6f11dffb8bebceabcccb6a2a6ded464e79803f60580f190291		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110D0 17656 bytes

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