Malicious PDF — malware analysis report

Static analysis result for SHA-256 e854c416427744a0…

MALICIOUS

PDF

81.9 KB Created: 2021-09-18 10:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6b2764b224cdb97c1ba265af282f0f92 SHA-1: 65761e0f1f49883d450de222327b74b4510a09c4 SHA-256: e854c416427744a0b1f57b9450b20e9a7fdf06333c0a0b30f0498fa235ed509e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured to appear as file downloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, a common tactic for phishing or distributing further malware. ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports a malicious classification. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

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 https://pixomot.ru/uplcv?utm_term=5+letter+words+that+start+with+go
    • https://nvsrolko.org/ckfinder/userfiles/files/jadefedunajalidid.pdf
    • http://hypotekaprezamestnancov.sk/res/file/65999451588.pdf
    • https://ecohort.info/userfiles/files/10900805941.pdf
    • http://bjsixiang.com/jingkelun/userfiles/files/20210908124442.pdf
    • https://turkuazhost.com/calisma2/files/uploads/vopomivabe.pdf
    • http://sspvjd.com/FileData/ckfinder/files/20210903_FC29F4B278A9645B.pdf
    • http://kolaykanal.com/userfiles/files/binuxenetibepa.pdf
    • http://myucmas.com/userfiles/file/puxenefigigademoralovo.pdf
    • https://abzesolar.com/uploads/files/96414421407.pdf
    • http://vucert.vn/uploads/files/20734716740.pdf
    • http://saint-party.com/media/file/wimotunasefusorokofosu.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404a8997858.pdf
    • https://kozmetikadunakeszi.hu/userfiles/file/xolajobajodunot.pdf
    • http://molenat-energies.fr/molenat.com/images/editor/file/13560742680.pdf
    • http://thietkewebsite.btccorp.vn/uploads/files/26754884507.pdf
    • https://martan.es/cenavarra_userfiles/files/39094848933.pdf
    • https://zemtechnika.lt/public/site/0files/59540708345.pdf
    • http://geologocarmignani.com/userfiles/files/bapinexizazafutapu.pdf
    • http://westernstudioservice.com/admin/userfiles/file/25429084048.pdf
    • http://about-dogs.ru/upload/file/gonifekamuroz.pdf
    • http://immobiliareborghi.com/userfiles/files/47621567780.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/161383031a4a2b---22208038050.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_off0000dafb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFB 16792 bytes
font_01_sfnt_off0000f312.bin
dae756750daf2495e3f5a62026ac89f77f879fe77bfe95f2b26995959d2a3f6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF312 10544 bytes
font_02_sfnt_off00010b19.bin
bdba593a221bd3e6091360b5aea80dddfaf5a27762d15986201ea5d1667991de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B19 17976 bytes

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