Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f7bf5f4462c0303…

MALICIOUS

PDF

73.9 KB Created: 2021-09-15 19:31:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f9e72394ae5eb3943f486dfc90cd0635 SHA-1: e047aa7154ad16372f3be922281adfcf9b1bb53b SHA-256: 1f7bf5f4462c0303f1dfd0847ff613c6886a2594bce6b8021edb5b0d31c89e8a
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing malware. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm heuristic point towards an attack pattern involving directing users to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://impressivetravelvietnam.com/upload/files/batozakuwovamokovatetopub.pdf
    • https://inprovitmexico.com/ckfinder/userfiles/files/3919564409.pdf
    • http://gsmontaggi.it/userfiles/files/lipisojagoxuresanibom.pdf
    • http://jl-vacuum.com/upload/files/motomibo.pdf
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/sijezavopasoguli.pdf
    • http://shippingengineering.com/files/ckeditorothers/bipizarew.pdf
    • http://studiodrago.eu/userfiles/files/80402403053.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161371d21b98f5---gafidun.pdf
    • http://bumsnab.ru/uploads/files/filakuboramowezolaf.pdf
    • http://mislenyiallatorvos.hu/userfiles/file/93531514618.pdf
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/fokawilifulanasage.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/nf6s3g7rf3shmvbou147ipgss5/sanazinezona.pdf
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/48615591542.pdf
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/genabaxena.pdf
    • http://yuanhebiotech.com/upload/files/temabovoviwa.pdf
    • http://www.icareonline.net.au/ckfinder/icare/files/nofavudoxuzelirosapebe.pdf
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/dunukubi.pdf
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/18145073712.pdf
    • https://fpcofmacon.com/nbloom/fckuploads/file/fedexolekumoja.pdf
    • http://inoxbienhoa.com/upload/files/vexegipugevodizifu.pdf
    • http://www.cemeba.com/uploads/ckfinder/files/64304322391.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=vice+city+game+download+for+mobile+free
    • http://e1pl2.nazwa.pl/busy/fotki/file/dofufasulivolef.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_off0000bfd5.bin
70d20965993ead0b68810a0f75143847d10ade6a83be2c661d3e947f05598518		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBFD5 16072 bytes
font_01_sfnt_off0000e8f0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F0 16792 bytes
font_02_sfnt_off00010107.bin
5188d6973880f81348233712a85111854af30fd4c2828616ac6cbdec5a94c430		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10107 10960 bytes

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