Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd814eccfbc65028…

MALICIOUS

PDF

84.8 KB Created: 2021-09-14 11:37:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 97a861cbf66c1af8350c4e1cb77c0cfb SHA-1: cba2d9e4fa0a32dafcbc9adf0fb826967ee4217a SHA-256: cd814eccfbc650281298b818101ecb78b58dfb06de9e084dab9b071e66f3b0f0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The sample also includes numerous external URIs, many of which are part of a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=ps4+mobile+apk+download PDF link annotation
    • http://www.urbanwaterways.info/files/26629303170.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/kagonajo.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/24502278398.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/99994698438.pdfIn PDF document text
    • https://pr-dienst.ch/file/wapefujitub.pdfIn PDF document text
    • http://kovovyroba-nosniky.cz/UserFiles/File/57136010525.pdfIn PDF document text
    • https://jocafoto.com/fotos/file/kifuluw.pdfIn PDF document text
    • http://polenes.cl/userfiles/file/kivapokisisewevasuf.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/wexiludunakimenogedaduso.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/55699656931.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/ripugogixokujobegono.pdfIn PDF document text
    • http://didongsinhvien.com/upload/files/wonidarazirujo.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/8567455207.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/61625480803.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/99243871274.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/vukawalirapodakixe.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/jinuxakawolojilimu.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/78144641124.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/pejokijav.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131b0d776a1c---saxuzajujaxed.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/58484356131.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/nokane.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/2021910955274316.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/81847903229.pdfIn PDF document text
    • 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_off0000e37e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB90 19212 bytes
SHA-256: 49b6e1f17f741da9f428f42e208a4fcee235f57ea9d403e74446d0a35ce6db72
font_02_sfnt_off00012d44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D44 10752 bytes
SHA-256: 0c35e491c5bb0e850ef1b18f92eb8a9ac74cb0b767a7ef8c754caceed06de2ed

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