Malicious PDF — malware analysis report

Static analysis result for SHA-256 876418af4990df5c…

MALICIOUS

PDF

81.8 KB Created: 2021-09-24 03:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e7510db768704ae1a121978759ff03cf SHA-1: 2106dead38cc3354c56458860df0bde761f04734 SHA-256: 876418af4990df5c7996f38a655089e184423ea3d392e6eb9a313c92f6c12b0f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which point to PDF files on various domains, suggesting a link farm or redirection mechanism. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that this PDF is part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://popnmusic.fr/userfiles/file/34661392529.pdf In PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210923034708.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/36138118151.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/40288970452.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/zexazefijutarezazujo.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/39094680684.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/72426131447.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/36856995785.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210916_173555.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/wutolekelomuguviwiveso.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/ridexijurowo.pdfIn PDF document text
    • https://nasikampung.info/contents/files/51040179064.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/4819584328.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/3803b7fdf48b7c9e17382af070d8d90d/naxerabanejoxunimodasav.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/sisagefaw.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412fe9216a9---3743464614.pdfIn PDF document text
    • http://ndt-ultratech.com/files/77871832096.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/92262369090.pdfIn PDF document text
    • http://methese.com/upload/files/vesovuzepefirakobubawim.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/57780108380.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/mibivobunodubumek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+put+dye+in+a+cauldron+in+minecraftPDF 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_off0000d405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD405 20252 bytes
SHA-256: b00766fe76be2eadc2e8cf4ae5cacbd94b21c1236c99553129e7f3500556e647
font_01_sfnt_off000108a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A2 10904 bytes
SHA-256: c258e21e2c0c1651e4003bc03944a93574ff17d63a96dffbefcc39cd94ab2f7a
font_02_sfnt_off000121de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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