Malicious PDF — malware analysis report

Static analysis result for SHA-256 6003b580a0361a6f…

MALICIOUS

PDF

78.4 KB Created: 2021-09-12 01:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d10778af0e1acf3f61cbe21f203a5d9c SHA-1: f47f03f620f7029a31b8c99e5ee2819ed21ac358 SHA-256: 6003b580a0361a6fa575236712be5a2a9224c5c2b1fc7ebe4c78c5abc9d95bf5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to obscure the true destination or spread malicious links across many low-reputation sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://irlanc.ru/uplcv?utm_term=a+textbook+of+geomorphology+p+dayal+pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137007d4b3ea---81943610477.pdf
    • http://thumpamonpally.com/userfiles/file/36573264195.pdf
    • http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/temalevudaxu.pdf
    • http://newdimension.su/userfiles/file/rikuzeliwonova.pdf
    • http://nceed.kr/pds/userfiles/files/nirijelurajapazedi.pdf
    • http://am-assets.com/aom/magnolia/userfiles/file/69825902711.pdf
    • http://thenext.pk/userfiles/files/ladofud.pdf
    • https://lalicorne-hotel.com/userfiles/file/xijanitexiluzapisafogikib.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16136a0984a2fd---80241303939.pdf
    • http://quatanggiabao.com/images/uploads/files/gokevikuwusiganusipefow.pdf
    • http://americasbestwingspa.iorderfoods.com/uploads/files/61174932531.pdf
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/radevenomox.pdf
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/8601479746.pdf
    • http://sineadstone.com/userfiles/file/66556309452.pdf
    • http://tdvvietnam.vn/webroot/img/files/40273167971.pdf
    • https://literie-depot.fr/UserFiles/file/jebozu.pdf
    • http://registermycompany.in/admin/userfiles/file/74314773307.pdf
    • http://tatnhapkhau.com/ckfinder/userfiles/files/loxofajet.pdf
    • http://stylowa-pss.pl/userfiles/file/86956070342.pdf
    • http://tbff-bygg.se/img/files/86493364447.pdf
    • http://almawred-sy.com/files/adminfiles/files/64450550157.pdf
    • http://pk.mo/userfiles/file/wikaferanebekexebovalas.pdf
    • http://alacarte-design.de/userfiles/file/89890620438.pdf
    • http://bobiniauto.com/userfiles/file/daribudijulivogewa.pdf
    • 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_off0000cfe8.bin
4881da7adf50dc486d779027d42396d5960f772431507fae4c3df147a78c1bf0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE8 11008 bytes
font_01_sfnt_off0000e923.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE923 16792 bytes
font_02_sfnt_off00010135.bin
6089ab4970ec0833cb28862acd9ced32e9c55b9526e4df441de527adf8b9ec44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10135 16664 bytes

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