Malicious PDF — malware analysis report

Static analysis result for SHA-256 99813cd68cee5c0e…

MALICIOUS

PDF

69.5 KB Created: 2021-09-26 03:12:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d8dd1b5fafbc8c86d0a1bb721952cbd1 SHA-1: 05373880d37c799c399c56886d8d4f9bcea2718e SHA-256: 99813cd68cee5c0ea55b68a88b06653475f06fe19bbc33db7efda145c43f6b23
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, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://wastran.ru/uplcv?utm_term=viper+4+android+no+root
    • https://huanghecables.com/d/files/8701747221.pdf
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/sowaxifitofisimoborul.pdf
    • http://ingatlantv.tv/userfiles/files/nolaruxatiposoputedidid.pdf
    • http://mateuszkucharski.pl/admin/file/ruwebori.pdf
    • http://somkuthyoptika.hu/editor_up/67722174169.pdf
    • http://sungsam.net/userData/board/file/52141163331.pdf
    • https://spotiverify.com/ci/userfiles/files/dofovuvujotomixoxonanew.pdf
    • http://shinyoungvalve.com/userData/board/file/76581305254.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613dddb685365---43511147803.pdf
    • https://at1-turbo-j3t.com/contents/files/wijexal.pdf
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mezozesuridipap.pdf
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/vopaxevabupixo.pdf
    • http://alacarte-husum.de/userfiles/file/buwefaludiletenitel.pdf
    • https://magic-ray.shop/uploads/files/dagafovoletotu.pdf
    • http://quiltingacademy.net/fckeditor/userfiles/file/rodofibuv.pdf
    • https://yumasri.com/assets/ckfinder/userfiles/files/katugipizetedifo.pdf
    • http://autoescuelatosal.com/galeria/files/48508869585.pdf
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/nimoxuwodusazefesewujese.pdf
    • http://tunecharts.com/userfiles/file/45969552917.pdf
    • https://ppuhperspektywa.pl/files/edytor/file/7106787249.pdf
    • https://megalight.lv/uploads/files/rivarunatame.pdf
    • http://richardchong.com/userfiles/files/34663807568.pdf
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/vugejevutijavut.pdf
    • http://vina2002.com/uploads/files/tovepabenu.pdf
    • http://studioarchterreni.it/userfiles/files/tuxawadulebawekajigadiju.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_off0000b31b.bin
b29e4f36312ab60fb397bed5bba5cda91074139054a3ee35990e958ae6fa14f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB31B 14880 bytes
font_01_sfnt_off0000d901.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD901 16792 bytes
font_02_sfnt_off0000f118.bin
3f978c0c27f0d1dcfd2d8c244dcd63935a03ac50a3e20efcfcc8b15334a0e04a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF118 10216 bytes

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