Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb1e3b12b21be2a4…

MALICIOUS

PDF

79.2 KB Created: 2021-09-23 21:28:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d76d619196b440c7e0308c28831d49f3 SHA-1: b587f7240765a0977497385cfda89e52f093e79c SHA-256: eb1e3b12b21be2a4371b1a4c88674b2ecd552f19c708865fe759cb7bb248cedd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and URL patterns suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=whatsapp+database+recovery+software PDF link annotation
    • http://mopi.eu/ckfinder/userfiles/files/pixerekuzibifewusitunu.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/midomafup.pdfIn PDF document text
    • http://familiegravesen.dk/userfiles/file/96404095445.pdfIn PDF document text
    • https://blueparadise.pl/userfiles/file/guwakakumuk.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/98579150119.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/030032483995.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/resofonunomidifavekak.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/pepabapokolupelefur.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/96339615223.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/widasaduvapojowimukeral.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/62677874521.pdfIn PDF document text
    • https://mimpiindah1.com/contents/files/vagunopozavuze.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/61589459068.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/wupasunego.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/tujodamixuvini.pdfIn PDF document text
    • http://demkapi.com/resimler/files/77792874244.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/wagunuxixofubejojotarak.pdfIn PDF document text
    • https://restaurant-kamkok.fr/img/Data/file/rapegew.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137dd58e761d---leveko.pdfIn PDF document text
    • http://bbu.vn/Images_upload/files/83013473849.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/13389291463.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/37933032732.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e989794149---bedaganutowoxipelafego.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_off0000d1fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA12 10876 bytes
SHA-256: e9c9029530e04854371812a5c0fec9a48dea2f4f82ec0ce6e9ecbb5ca4aa3506
font_02_sfnt_off00010334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10334 17364 bytes
SHA-256: 2d6e0ee2963136be46469822b5c65d7c3ce76d85a9c7e6516a68a0470616db1d

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