Malicious PDF — malware analysis report

Static analysis result for SHA-256 c38e7cfb814fb727…

MALICIOUS

PDF

82.4 KB Created: 2021-09-20 21:57:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 91e7689684620b22a0ad59acdbeb52c6 SHA-1: 3fdcd6d34bff37409263f9594884cb2f1aa92d10 SHA-256: c38e7cfb814fb727ed3dc15ccf84274eadbc266be0aa416d1e11153a5d9d9fe2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a common attack pattern of luring users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://infrive.ru/uplcv?utm_term=excel+to+pdf+converter+app PDF link annotation
    • https://lentes123.com/aym_image/files/50796672437.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/tejasobiz.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/74480102214.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/66006991713.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/bejimejeferewisiwuko.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/13740421970.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161429d6be2aa1---90160146473.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210908055841.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/sadiwisonapenoxaditumod.pdfIn PDF document text
    • http://adamex.ukrkarta.ua/fckeditor/userfiles/file/milawus.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/41612049217.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/5726770097.pdfIn PDF document text
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/7622789089.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/bowuvezinowuxedese.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210911234644.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109191610278397.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/kivowarawifux.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/bovoxifawoposolobije.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/76040443471.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/wojexunixexez.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/18471678857.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210920023146.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_off0000dc56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF468 18988 bytes
SHA-256: cef0af62e6989b3433fac040fe1bab16a051cfff9cf93a76b2f010abc44400f5
font_02_sfnt_off000123cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CF 10504 bytes
SHA-256: d3abe173edbb18db9d3740b761bdab4aeb1ecc06eddb372a713909d094eeabda

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