Malicious PDF — malware analysis report

Static analysis result for SHA-256 da9a3984bae03594…

MALICIOUS

PDF

73.2 KB Created: 2021-09-16 05:02:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bab154d0e50806cc749be8f6eedce54d SHA-1: 220e74802e9ab28b164b49b2ac2735ac3b0c9111 SHA-256: da9a3984bae03594cd347469e07ef06c83a7cd77c173bb02e414697b8f34333a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded URLs pointing to various domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://chcial.ru/uplcv?utm_term=killing+me+softly+piano+pdf PDF link annotation
    • http://pttaccounting.com/userfiles/files/23671316375.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/nafelapap.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/lugogefonebasajegonuf.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/17459900794.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/kigagixobaju.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/torosefupu.pdfIn PDF document text
    • http://www.sanjuktabanerjee.com/fckimages/file/kasafoxabapiluxonawisixik.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/5650438092.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/xukoloteserazalurozif.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/42599020786.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/12964393304.pdfIn PDF document text
    • http://benly-carson.com/product/files/18837743749.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/76605931412.pdfIn PDF document text
    • http://abc-tel.ru/data/File/mirumamuzofubexapupugup.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/lanopepunubanogifoz.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/15765270637.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/55846558792.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/43270110663.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/kasudekakuxefabovidur.pdfIn PDF document text
    • http://fluorescent-training.com/file/kaperi.pdfIn PDF document text
    • http://vet-spb.com/userfiles/file/xunepagezemaxewi.pdfIn PDF document text
    • https://ladymamashop.com/uploads/files/202109151649284439.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/59664034018.pdfIn PDF document text
    • http://unleadedcoffee.cz/soubory/gajikujonopewage.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/19096091873.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_off0000ba02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA02 10844 bytes
SHA-256: 9ec6cb80cac3f495a2c1b94b50f8ae0645d10f9dc2b5659f1a5a410d004a023a
font_01_sfnt_off0000d2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CF 16860 bytes
SHA-256: 8c1765d579945ebe81962b628853d143ab403d11648d0bac4259bd6bfdf14288
font_02_sfnt_off0000fee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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