Malicious PDF — malware analysis report

Static analysis result for SHA-256 54990abbaff25e27…

MALICIOUS

PDF

97.6 KB Created: 2021-09-18 10:56:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 41520fe5ebde51419a7f1f13a9ee3b6e SHA-1: c366f1ca01e5d9155b9f90e17605bb39561c7565 SHA-256: 54990abbaff25e27012e8f396308ba298ee54e719111abdbb2205305557fe98d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. It contains numerous embedded URLs, many of which point to potentially malicious PDF files, suggesting a phishing or credential harvesting attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this by identifying a link farm on disposable hosting, a common tactic for distributing malware or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://mathcountsoutreach.org/userfiles/file/xuvobopezi.pdf In PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/sopawagavik.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/kujoludivenovofaxiduteje.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/dulutumuxaxamefabidaz.pdfIn PDF document text
    • https://sydneystudytour.com/accounting/userfiles/file/76128404944.pdfIn PDF document text
    • http://kleinschaden-expert.com/userfiles/file/xakigagutomukutiwel.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/putoviguda.pdfIn PDF document text
    • http://quangcaovuanh.com/vietkiendo/upload/file/tuwepabudurinufororewixaf.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/pujugivegapirotiso.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/xekukopebukixu.pdfIn PDF document text
    • http://cosyromania.com/media/file/vaxezus.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/25774359148.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/60622462840.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/ljfp80b00nmlvh1a7640fpsjs2/87147076253.pdfIn PDF document text
    • http://intertravel.hu/_user/file/jowogi.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/65536836242.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021091313181574.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/ridiranuxed.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/5776658459.pdfIn PDF document text
    • http://mgtuae.com/uploads/file/52772519357.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210901_E9A72F846EDD7163.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/felarit.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/20953863941.pdfIn PDF document text
    • http://lachina.cn/upload/file/jabipop.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/buxajofizakav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=backup+micro+sd+card+androidPDF 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_off000118a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000130b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B4 18500 bytes
SHA-256: d40dec21495e405f37a8abbe7e73b1c07540e85eca8ae1b6bd53d847fccb9328
font_02_sfnt_off00016035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16035 10644 bytes
SHA-256: e00d5b957f20dd06a6c5a78ce3f612624e80c0b2f86ed336fafbf4144ed7da7c

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