Malicious PDF — malware analysis report

Static analysis result for SHA-256 e503cd4fb14a8bf8…

MALICIOUS

PDF

81.1 KB Created: 2021-09-10 21:51:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 69c9beb57b56adbd4fcb0ae786aeedb9 SHA-1: 352e750375dd7f26fb50974438beea83bd057267 SHA-256: e503cd4fb14a8bf8274600bed501fd3ef1f9965ae0ae1dda42389ada67fe2110
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and a heuristic firing indicates it is a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a common phishing lure, likely delivered via email as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://archism.ru/uplcv?utm_term=roblox+music+sheets+easy PDF link annotation
    • http://nscenter.cn/upload/files/61602661400.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/27705311453.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/ketulefanusobenujuto.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/tuvadezemisaruv.pdfIn PDF document text
    • http://blueyee.com/upload/file/021018572706.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/nupuponijo.pdfIn PDF document text
    • http://giorgimpianti.com/userfiles/file/32864109563.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa87d2c802---zivetenoniwekubotuzafapi.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/47977781475.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/32962560404.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/dozitam.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/34895861579.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/gegubarabajamutalitib.pdfIn PDF document text
    • https://harom.ro/files/file/70258071646.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/rutukifejefogivekone.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/60b645620a56d4285566c0f7d232ac13/kejitofiwovonivojigus.pdfIn PDF document text
    • https://tch.lu/files/files/68837752762.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/34716062204.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/zujiroguwokulexusamub.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/zexamesesodatoxikigek.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/25664206731.pdfIn PDF document text
    • http://vtaky.sk/media/file/22052471961.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/rosevuxune.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/80459697655.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/pomoxobotot.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/fojavepilumexuduwoj.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_off0000d6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF12 10792 bytes
SHA-256: 57f6cc3424b5225e3ceef7dfa5085f9ddd8ff040c2c50fbf0e6fd28d77623573
font_02_sfnt_off00010809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10809 17832 bytes
SHA-256: 5ad146615d66b3540541829264efd3b9581fd9f9a199bf2ceeb3b4e65921faea

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