Malicious PDF — malware analysis report

Static analysis result for SHA-256 82b0c214f797702a…

MALICIOUS

PDF

72.8 KB Created: 2021-09-25 19:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b63d1636b00082b349f61ec61e2ce736 SHA-1: 8a8649051e96ab06b81cab625842846e2bdfa0e5 SHA-256: 82b0c214f797702a8de4d52f93f28cd821627cec710386e3844adef0bab9e759
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to obscure the true destination or purpose through a large number of links on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://www.oiseaubleu-promo.fr/userfiles/file/soranadivabuw.pdf
    • http://thechelseaff.com/user_uploads/files/kigipuxobemuzurul.pdf
    • http://www.coverseg.com/uploads/ckfinder/files/34527168227.pdf
    • http://eviljoy.com/UserFiles/File/13847020615.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/srou93p519aauicjipm3h33ung/wezadut.pdf
    • http://spc1991.com/ckfinder/userfiles/files/58918975442.pdf
    • http://boatmonies.com/uploads/files/sibifizakoxexupuzorekime.pdf
    • http://goldenstarhotel.vn/images/uploads/files/gakakazonaxabofupa.pdf
    • http://packagingandfoodmachinary.com/userfiles/file/rorisegukaxonadedimi.pdf
    • http://foto-recepty.sk/images/fotky/85603302667.pdf
    • http://kukdae.com/files/fckeditor/file/vunexixipuzelupoxubof.pdf
    • http://www.petersonassoc.com/emailimages/file/94530143277.pdf
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/zofogor.pdf
    • http://qlinairnv.be/userfiles/file/lixupelalumagugajovi.pdf
    • http://giaexploring.it/userfiles/files/86372024758.pdf
    • http://cualuoiskydoor.com/webroot/img/files/7865268942.pdf
    • https://cabsfromheathrow.com/userfiles/file/57394285306.pdf
    • http://nileagriculturalindustries.com/file/3020880192.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147d6c6c345d---84920556796.pdf
    • https://avukat.kocgrafik.net/upload/files/81591189444.pdf
    • https://stvietnam.net/luutru/files/tomixovetaxuwepatewe.pdf
    • https://rafautama.com/uploads/file/wikuxiziwirike.pdf
    • https://cakkue.com/contents/files/nuweme.pdf
    • http://weiddy.com/uploads/files/202109191610278397.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=wps+wpa+online+hack
    • 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_off0000b57b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB57B 16792 bytes
font_01_sfnt_off0000cd8d.bin
17f4da6a2ae4966f8eaef9c64606605881ad9c2e33003d6fbc78cfa4bcce56b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8D 18864 bytes
font_02_sfnt_off0000fe3f.bin
9577dbc41eb46715463bd0e20776dea11233495f01731f6f76b0210e4b26ebb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3F 10444 bytes

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