Malicious PDF — malware analysis report

Static analysis result for SHA-256 2878f75f81d1e20e…

MALICIOUS

PDF

81.7 KB Created: 2021-09-17 22:38:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: ba1b875a595635435045a0ccfa2654ce SHA-1: 29b5f8ef581a4985f151d2545107df04c67775dc SHA-256: 2878f75f81d1e20e1611bd9b40cef4af0437e196fd1314738e82ef64b8d90de6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Embedded JavaScript streams are present, suggesting potential for further malicious actions beyond simple redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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=free+video+editing+software+for+windows+7+32+bit PDF link annotation
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/nufawamabixerusalizovito.pdfIn PDF document text
    • http://tavio.su/files/file/27729912486.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613adac887ba1---67384362769.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/14404657083.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-17/20210917062631908985.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/54854063050.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/71436772400.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/dokuxin.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/liroretatajegirufo.pdfIn PDF document text
    • https://sayurhijau.com/contents/files/tusaxex.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/palibuzab.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/fagaradugemememukusa.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/bujonalabami.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/77240489135.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/68287309223.pdfIn PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/99153164042.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/xefifi.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/menujas.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/pixakexijobuguraf.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/vegewegiloxajavupijin.pdfIn PDF document text
    • http://vladekoservis.ru/files/44542236514.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/sulolojuridaburidix.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_off0000d899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD899 17980 bytes
SHA-256: 8a44b87843780aab2ae4b586cdf5365e36f235e612b5624606ff2a33019c9a7c
font_01_sfnt_off000106a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011eb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB9 11096 bytes
SHA-256: a7cdc7c9d8797c5237cf74cb76166b8bd4a751d4369c6535e67687a1ea224890

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