Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec32c24dacd3c996…

MALICIOUS

PDF

69.7 KB Created: 2021-09-24 13:01:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8cdbd6ea824789e5de4de8ca8b98fe36 SHA-1: f1351accd47303ec8ead8b9629ab80008c882311 SHA-256: ec32c24dacd3c9963599b44ba29f87429cb0ec1c583ec7b4483e86f0661cce66
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings reveal it functions as a link farm, embedding a large number of URLs pointing to potentially malicious or phishing sites. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the document's purpose is to redirect users to these external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://ketchas.ru/uplcv?utm_term=applicazioni+android+craccate PDF link annotation
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/piraxuma.pdfIn PDF document text
    • http://esistore.be/userfiles/file/68586507895.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/wunedopo.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/90176655934.pdfIn PDF document text
    • http://zl369.net/userfiles/file/7610786118.pdfIn PDF document text
    • http://mqskin.com/luutru/files/doloruxavorazak.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/46290430096.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/66997163667.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/14209894657.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/12131810771.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/28930995202.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/25373539805.pdfIn PDF document text
    • http://hawaii-resort.info/images/blog/file/nekalabikini.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/99177860748.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/zagimanibupufipij.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/458aba35433286faa15dd6efe374429c/dekewetesu.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/ketibepaj.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/fodetaw.pdfIn PDF document text
    • http://leton.pl/userfiles/file/nekuvawazagu.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/besepofosixabevifavemeju.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/df6gqj40ampfdjccal865n8h6t/sazunifusifow.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/jidenowesatuwunil.pdfIn PDF document text
    • http://millionsdiscount.com/mo_images/files/tateji.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_off0000aec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D5 16948 bytes
SHA-256: 1ce2e86ad59ee4bbf03107f26d8aacdef1a3375824c94d486aeee2873351897e
font_02_sfnt_off0000f200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF200 10380 bytes
SHA-256: 0826b2cd2639d4b34fd410397243777e9060e1cfcfc4b3d42334caee86991206

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