Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e84ce382987d745…

MALICIOUS

PDF

89.3 KB Created: 2021-09-17 07:04:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 695de0de5149bc1290d65883126a4128 SHA-1: 7db8c4472e65574301633777cbe0dc9dc09a1224 SHA-256: 7e84ce382987d7456a7b8fc8b87542162c81238f52308b16ff19463512d62e40
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains an embedded JavaScript stream and numerous external URIs, indicating an attempt to redirect users to potentially malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic of using many links on disposable hosting to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pixomot.ru/uplcv?utm_term=the+power+of+your+subconscious+mind+free+pdf+download
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/pavewo.pdf
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/5756209674.pdf
    • http://plkorea77.com/ckupload/files/lodaxajuvo.pdf
    • http://smingames.com/ckfinder/files/dijopenoxurifugi.pdf
    • http://olivetheater.com/userData/board/file/86432864195.pdf
    • http://akicgiyim.com/userfiles/file/fowejebina.pdf
    • http://www.eau-msu.ru/ckfinder/userfiles/files/wutipe.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141e434eca9b---pemolofibekojar.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16136b9831b6a1---lerovefalum.pdf
    • http://miroslaws.com/ckfinder/userfiles/files/ribarus.pdf
    • http://trubaopt.ru/content/file/68010422065.pdf
    • http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/80195825504.pdf
    • http://pngroup.pl/ckfinder/userfiles/files/16541955086.pdf
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/81527868803.pdf
    • http://autosoftware.company/autoresponders_images/files/pixumetina.pdf
    • http://hoangminhphatkorea.com/webroot/img/files/lomekumekagibadedol.pdf
    • http://robedecreateur.com/img/files/xumiz.pdf
    • http://vhshf.de/File/tivawas.pdf
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/70981723512.pdf
    • http://unibeauty.com.br/ckfinder/userfiles/files/21102421925.pdf
    • https://durimawar.com/contents/files/67611023711.pdf
    • http://sonnenheizung.ch/fckeditor/editor/images/file/xefadebir.pdf
    • https://alpinashop.bg/files/93803240284.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_off0000f573.bin
616ee9174ac8c0bd8793bb4ca84ac2df1726cf89c65e646152167a7cbc2013a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF573 11188 bytes
font_01_sfnt_off00010f4a.bin
6b558586ca6c1e1b3504cd3c69d789f69208884c479a50659fd4fea8042e9372		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4A 18528 bytes
font_02_sfnt_off00013f03.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F03 16792 bytes

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