Malicious PDF — malware analysis report

Static analysis result for SHA-256 826f7b7bfeb4990f…

MALICIOUS

PDF

82.7 KB Created: 2021-09-16 21:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4b8f346f15cef3e2de4426f23d328405 SHA-1: eb9a5ac3811504e30c897333d61e93835afb37e0 SHA-256: 826f7b7bfeb4990f7a03e6f1e66714e3ce5769e86c7d14903460fd205bf336bb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the attack pattern of using a large number of links on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://infrive.ru/uplcv?utm_term=snack+video+free+coins PDF link annotation
    • http://dgxzz.com/uploadfile/file/97843368136.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/25497106266.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/tezodez.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/47546493848.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/59244259879.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/tutoneluwexi.pdfIn PDF document text
    • https://edusfera.pl/upload/file/kafubonigurikenavekizenad.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/3fe577fe0ce7a75388b9629eec51724c/sojalonesojol.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/70250758697.pdfIn PDF document text
    • https://egf.tw/test2/images/file/lufilaronusotumodotusa.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613785c1a1b1b---wanegapipavag.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/gigedozidizom.pdfIn PDF document text
    • https://almentispharma.com/ckfinder/userfiles/files/98631411231.pdfIn PDF document text
    • http://mediasingrid.com/js/new/fckeditor/userfiles/file/wabalukifafijagiponuzufi.pdfIn PDF document text
    • http://mopron.ru/upload/files/fopitofexid.pdfIn PDF document text
    • http://poliinc.com/upload/files/10493220263.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/78011979119.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/pezufoz.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/bemarak.pdfIn PDF document text
    • https://worldtradezone.com/userfiles/file/15725951428.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/36377283920.pdfIn PDF document text
    • http://oiseau-bleu-morzine.com/userfiles/file/xeposebix.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/tetizuvifawokava.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/vulikesezazap.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_off0000e073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE073 10556 bytes
SHA-256: 894c0d81cab05a0979400beca7f13f8d3bc6272b1a660282b2eedc7cf6fe9d0f
font_01_sfnt_off0000f8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BA 17136 bytes
SHA-256: bf6b9c663cefa5fe013a940cc5b0fd84a60aef8c8ffe46e317e8d7945a0d6797

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