Malicious PDF — malware analysis report

Static analysis result for SHA-256 10bff1eba1ae9e4d…

MALICIOUS

PDF

73.5 KB Created: 2021-09-17 20:08:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2cb73e274489a5d2e5e635758f77b2ae SHA-1: a3e87301c3c6b277b80d47fa308b0837da92af52 SHA-256: 10bff1eba1ae9e4dc42662694ace6ffc7c3b3e149652fb7eadc8fe8872fbfc65
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm with numerous links to disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded URLs, such as http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/jibilafexetijen.pdf, are key indicators of this malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/jibilafexetijen.pdf In PDF document text
    • http://homeopathyhk.com/files/81649212475.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/larejafatuvixera.pdfIn PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/6388363482.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/jobuduwurini.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/fikerujaxusaduxepesapojo.pdfIn PDF document text
    • https://vinaconexmec.vn/uploads/news_file/21989780192.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/xipemepinali.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210916220212.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/64303761778.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/mosilekorufubexep.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/63485870381.pdfIn PDF document text
    • http://state-lithium.com/upload/files/74731342262.pdfIn PDF document text
    • http://www.centrosanmarco.eu/img/news/files/kusawigagab.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/patakufejerazidapo.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe20c1d068---13336436069.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d0467b685---luxibelim.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/mekobut.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/vapukorovebelubedu.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/69692615859.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/84194423220.pdfIn PDF document text
    • https://tonmathunglan.vn/upload/files/kesumeramupazafemuxob.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/todaxavojexatibaxevaregob.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/gupakasizugedi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=class+2+grammar+book+pdfPDF 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_off0000bc0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC0F 16972 bytes
SHA-256: fe5e323e96e169d99e98d6bae6561f53f3907f0278703c1020af3517ad9eac31
font_01_sfnt_off0000e7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E8 10800 bytes
SHA-256: dd46c21af559c6568d356791987cdc9095d45abacd18f3171a41a2b470848b89
font_02_sfnt_off00010072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10072 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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