Malicious PDF — malware analysis report

Static analysis result for SHA-256 beb2927ec98d4063…

MALICIOUS

PDF

77.6 KB Created: 2021-09-21 02:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 23a6221e3f48f4f4a1d3178166387921 SHA-1: 5fd4810a0eea40cd78049be7537f04840f7e2013 SHA-256: beb2927ec98d40639f6f8052342072f29511332159d637465e9e324884b3c3bc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggest the primary goal is to redirect users to potentially harmful websites.

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://archism.ru/uplcv?utm_term=homeland+season+6+subtitles PDF link annotation
    • http://chieusangducphat.com/uploads/userfiles/file/91001643535.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/22790068122.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/dokumonew.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/96138762290.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/22709210563.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133113204214---lazuvenawuraki.pdfIn PDF document text
    • https://alpinashop.bg/files/44059331066.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/70900217912.pdfIn PDF document text
    • http://poliambulatorioargentina.eu/userfiles/files/67641237251.pdfIn PDF document text
    • https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/dabikutogamor.pdfIn PDF document text
    • http://sklenicky-obchod.cz/web/admin/fckeditor/userfiles/file/91288227790.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1631314024.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/rowafanijefox.pdfIn PDF document text
    • http://klenderbio.com/upload/files/pojategelu.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/neputigorazur.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/52962625162.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142434300dd5---womewulelojebageri.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/79222269794.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/budosudubakutifurovax.pdfIn PDF document text
    • https://strategieb2b.ca/userfiles/file/fotiwepunalurife.pdfIn PDF document text
    • http://www.gitialiganjlko.org/ckfinder/userfiles/files/99940817412.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/vuzebikuvovagesabavemaxa.pdfIn PDF document text
    • http://chuabenhxuongkhop24h.com/images/files/35347310169.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC995 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A7 18304 bytes
SHA-256: 8b353531490168ab4d1a3a52d0cc7566b693a5ca60da5568992f3e9dab1f61f0
font_02_sfnt_off000110ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CA 10708 bytes
SHA-256: ecd70616e8e2a51f345c35c897a066d3209a9d211d8d8c5a9df5262a61740e0a

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