Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c81ecdb06065496…

MALICIOUS

PDF

71.2 KB Created: 2021-09-18 07:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ed54542bde03276be685f5c341f17ef3 SHA-1: 3eebadf1edd0f4e86c7b2857d683d0ded010c76a SHA-256: 5c81ecdb0606549689f23ea0d500346e57d58bc5c9440b323a2f31e66b444966
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by identifying the PDF as a link farm on disposable hosting, designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://inwebjor.ru/uplcv?utm_term=genshin+impact+mora PDF link annotation
    • https://transmilenio.net/datamont/userfiles/file/lavuri.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144f42895965---32924901853.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/xevakasiruvekegukugiv.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/88092831535.pdfIn PDF document text
    • http://adamex.ukrkarta.ua/fckeditor/userfiles/file/vafisufovobavuporawile.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/virotavikilejipiwo.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f023c85e5b---murogiw.pdfIn PDF document text
    • http://ckpak.com/fckeditor/userfiles/file/dasigesuj.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/46708192518.pdfIn PDF document text
    • http://barefoot.pl/userfiles/file/nuwerefigopovakidadusupo.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/rexofonoberelos.pdfIn PDF document text
    • https://drlanda.hu/user/file/xilalodazidupoxuselixiw.pdfIn PDF document text
    • http://kingswaytyres.com/project/kingsway/uploads/file/8458011582.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/parukibubasozu.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/fevisoxopasoba.pdfIn PDF document text
    • https://beautifulhairstore.com/upload/files/xepenekukifafivuvixasut.pdfIn PDF document text
    • https://svltv.in/userfiles/files/motebesanitifaxofagur.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/zuxefem.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_off0000b531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB531 16560 bytes
SHA-256: 74e54891bc68a7435bebab76d551d3aaeed330494ff909b3f7cb3d9d1cb6952a
font_01_sfnt_off0000dfbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBE 10632 bytes
SHA-256: 6a8545594595c70de5a004a91399474a4474469902c3eee3d55d72e146d91ce7
font_02_sfnt_off0000f7eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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