Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad6940748328d05b…

MALICIOUS

PDF

77.8 KB Created: 2021-09-13 07:31:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 97039c8a488edf6e3440f8603aac8a4f SHA-1: de296b85dc9e80d45db7cea965dd2255dee99ec2 SHA-256: ad6940748328d05bdb65426a8a1eed8785403c6e90a8530bd1fa78b239650840
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs and is identified as a link farm, suggesting it's used to redirect users to potentially harmful sites. The PDF structure and heuristic firings point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://k-newsletter.com/ckupload/files/67700113853.pdf In PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/ramedokodirapanapur.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/45073576326.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/silazuladiwidura.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/39925446966.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/42577347773.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/vovisinefusatek.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/7352624183.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/84353394990.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021091114004664.pdfIn PDF document text
    • http://npas.ru/pic/file/palorevusujawutokituwiki.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/43538037623.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210901_47C065A0F81F48D9.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/wigiguzowofugosefarurod.pdfIn PDF document text
    • http://budropol.de/Upload/file/pufafulobunizenonisunabux.pdfIn PDF document text
    • http://totoumi.jp/upload/file/zesor.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/93029356850.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/20401042755.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/22952280305.pdfIn PDF document text
    • http://goang-hann.com/uploads/files/202109030430094463.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/75585940230.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161302037b3bed---jekigugezexatitozejirog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=pdf+to+excel+converter+offline+free+download+full+versionPDF 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_off0000c92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC92F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE146 10824 bytes
SHA-256: d854659ffb68e6bf5f19a6ced1190b824ed3ca4c8c4867e72ef6233e7a1b3568
font_02_sfnt_off0000fa71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA71 17156 bytes
SHA-256: cf31c579b5dedee2ea125c4645919f0f7f736a54d74997b36bba075085472470

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