Malicious PDF — malware analysis report

Static analysis result for SHA-256 898d63b81e5d2c9b…

MALICIOUS

PDF

68.0 KB Created: 2021-09-30 17:21:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: a698e1f1b4efa2068c0da089390644ad SHA-1: f448206c00099ceb75b9f7cb07c049fcafaecbad SHA-256: 898d63b81e5d2c9bf70c0b1b47ad2bc8df00d4ddfd71b6f40455a1832004e3eb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://dgxzz.com/uploadfile/file/pewifafezaramirug.pdf In PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/bajanumazeje.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/kosezikopagizanovobomugup.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/43805350213.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/13955642502.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/xomorixisoli.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/lowiro.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/7309319146.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/wazivaxelulapumojigupiro.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/girekonijatikopag.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbf1642f35---92148419853.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/tinezumifot.pdfIn PDF document text
    • http://novastal.pl/userfiles/file/kilelijurudimaxuvufabol.pdfIn PDF document text
    • http://infoguard.ru/content/file/pusuxirososim.pdfIn PDF document text
    • https://garmin10.ddbseven.cl/userfiles/file/67689463898.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/55244141113.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/mojesodiwow.pdfIn PDF document text
    • https://arendic.cl/files/godigomejiporafuvap.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/96763870072.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/59601747537.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/23700172115.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=android+app+badgePDF 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_off0000ae50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE50 14868 bytes
SHA-256: 1787c06fb39e149692695b2a4f08e65e7dae6cde2ae809d93aa846a83608e46b
font_01_sfnt_off0000d393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD393 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAA 10376 bytes
SHA-256: 89f03efba0242bea9a6bde6bd1eb602f97c02d92305ead049ae6ef127a85066f

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