Malicious PDF — malware analysis report

Static analysis result for SHA-256 3714b087477aba30…

MALICIOUS

PDF

70.0 KB Created: 2021-09-19 14:26:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2b47b1cb0de3e0c2a7e5966e7dfdba70 SHA-1: 5f92f1843098aa453ca064a9f95b65bccf9386e1 SHA-256: 3714b087477aba30c29c1259687073f88a4017181b93bdc1d21c20dd5185cc5c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous embedded URLs suggest the document functions as a link farm, directing users to potentially malicious sites. The ML_NYX_PDF_MALICIOUS score of 0.997504 strongly supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://aihyang.com/userfiles/file/dirur.pdf In PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/16426163194.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/repevi.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16135ad7a7d382---jopovogubobiw.pdfIn PDF document text
    • http://vejwun.cz/images/86635274047.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/83779888773.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/xiwumirifamomo.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/77023113332.pdfIn PDF document text
    • http://donghotam.com/luutru/files/nexodazimaxopavilagosut.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/32812840238.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/32500958124.pdfIn PDF document text
    • http://komodovo.ru/upload_picture/sisavebogazijam.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/wutunavitilikoveruxuli.pdfIn PDF document text
    • http://samtle.net/ckupload/files/pepimadugeviwovavi.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/miwijazofenezipazibiv.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/33917404611.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/35853117399.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/32554262675.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/86988612711.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/1482259669.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/77290307381.pdfIn PDF document text
    • http://cnex.cc/images/blog/file/bitimida.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/79051829058.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dasulivikedexim.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/85709409212.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=play+store+advertisingPDF 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_off0000b49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB49C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB3 10604 bytes
SHA-256: 228f679aa9dca6067eead40ac8385b89fbad70ef6ea1bafb1143d9f1cedb6fe7
font_02_sfnt_off0000e4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E9 14864 bytes
SHA-256: c05284e0eb4c4d37fcc5e8f9b1e17d1f2b44a4c6fab489cd7f4e0e91b8b8c8e1

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