Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e779a577faba3ef…

MALICIOUS

PDF

86.0 KB Created: 2021-10-05 19:54:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c8c62190dbcf94805ce41ad05b9c6d86 SHA-1: 87c45f21f3cc23ee930e96d7a38894153fe77786 SHA-256: 7e779a577faba3ef8f19baea0ad657dedfcf87e9fd076c470b2b7cca5e2fb7dd
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for malicious PDFs to execute code or redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs suggest an attempt to create a deceptive web presence, likely for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://amirmazandaranihospital.com/ckeditor/files/files/sidigifokozubotivolitago.pdf In PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/72564376542.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/pedumi.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/fedanamo.pdfIn PDF document text
    • http://boldogelet.hu/media/sisonibumuxixafutokef.pdfIn PDF document text
    • https://rm-parketi.si/uploads/latelejanipenezodoxosox.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/75011926821.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/geratokasuvowolak.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/xutumo.pdfIn PDF document text
    • http://adamex.ukrkarta.ua/fckeditor/userfiles/file/derosufag.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/dajogewamefujozotuj.pdfIn PDF document text
    • http://aa-nusd.jp/99358284908.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/lelokidexu.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/66556206063.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/163053792945304775.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/29702229693.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c9a3db893---90557810994.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/janovozegoxewofusokoka.pdfIn PDF document text
    • http://goref.ru/files/file/legotonisitisi.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-25/20210925143022584642.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/55601719220.pdfIn PDF document text
    • http://innobiztour.com/FileData/ckfinder/files/20211004_812A95ECAC764B11.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/kemagusepaxepokoloxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=sc+workers+compensation+commissionPDF link annotation
    • 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_off0000e904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE904 10744 bytes
SHA-256: 5226b44d9df1490eedac785cd57bb626a4b74bf62b8cf49936acb439a026831b
font_01_sfnt_off000101c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C8 18728 bytes
SHA-256: b1250470cce89d0b0db1369f3d42f9a298f51e8a014d56a45a03279720213223
font_02_sfnt_off0001329b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1329B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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