Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6812e0f25279d63…

MALICIOUS

PDF

71.0 KB Created: 2021-09-26 04:20:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9aab80de1363cc369a769279217f93d7 SHA-1: 1591707512917860bbaf89251ea08368187940b3 SHA-256: a6812e0f25279d63747e5c4ce421c31ed5e455fe7e88ee4510f9aaf51e4c3a91
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to potentially malicious domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://brs.jo/userfiles/files/duromopoladexo.pdf
    • http://slotkuda.com/contents/files/69561000624.pdf
    • http://n-production.com/upload/fckeditor/file/wesijijukejezitigizaxi.pdf
    • http://asvpp.fr/pdf/zirajiredemomemetonizisij.pdf
    • http://bdsps.org/slbdavbatala/userfiles/file/14728841876.pdf
    • http://mmckno2010.zkosuchdol.info/files/41854918067.pdf
    • https://nmcs.ca/userfiles/files/pubufiwujijifapivaveri.pdf
    • http://geodeslaboratori.eu/userfiles/files/12669694399.pdf
    • http://mascotdd.com/file_media/file_image/file/jazujipesi.pdf
    • http://romengo.com/ckfinder/userfiles/files/ripagoma.pdf
    • https://emenu.hu/editor_up/fifewajajadalituzupigepid.pdf
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/pozizeroparur.pdf
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/69126820250.pdf
    • http://bhavalaya.org/ckfinder/userfiles/files/xatapuleserobatidu.pdf
    • http://driver-jazda.pl/upload/file/57267563293.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/vp3rblb8ijotb5f5qk2ij3kkba/48106981320.pdf
    • http://veterinariacasettamattei.it/userfiles/files/65043419282.pdf
    • https://alarouba.com/ckfinder/userfiles/files/xorugokopadun.pdf
    • http://iberryhomemade.com/userfiles/files/60701618596.pdf
    • https://moolans.com/uploads/files/jozajuwumutarosajaxusab.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161446d103aed5---vopagajafisin.pdf
    • https://hobbes-group.com/upload/files/39460724702.pdf
    • http://lesbambousbleus.fr/ckeditor/upload/files/bavadasuguxisiropefuz.pdf
    • http://wx-bm.cn/upload/ckimg/files/202109160454184647.pdf
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/27703313462.pdf
    • http://alphasigmaoverseas.com/userfiles/file/90337913229.pdf
    • http://ekonopuntos.com/campannas/file/32759562862.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=canada+visa+forum
    • 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_off0000b606.bin
c8ae53f987a8960136013587ed8a9b414d6ae4d4075c0a0da58780db8f865963		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB606 15896 bytes
font_01_sfnt_off0000dea4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA4 16792 bytes
font_02_sfnt_off0000f6bb.bin
334b0e38abae52428d8358b7eee6a9d8d0f248ba3fdb66d7080acb02e5bcc4ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BB 10436 bytes

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