Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6c72b33e024ed67…

MALICIOUS

PDF

71.7 KB Created: 2021-10-02 09:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 758e5279d134ad66d73f26e18f09ea6a SHA-1: b471d9ce2edfb02a317c66fb6105835073870de1 SHA-256: d6c72b33e024ed67606a65144cb3c6049c662a568c7509685a26e24b73a06ade
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 point to suspicious domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malicious content. The file's structure and the presence of multiple external links suggest it's part of a broader campaign to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://alidongdong.coco1490.com/upload/file_folder/file/xewigukufedakusis.pdf In PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/vaxawumamoroki.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/safisobefukuk.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/vexotiz.pdfIn PDF document text
    • http://mega.kz/media/upload/files/vujuzafujizemawalume.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210908045218.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/161485f624c77e---zobapolelaraf.pdfIn PDF document text
    • http://newgoodluckcrane.com/admin/uploadfiles/file/gonuvolarinivipoziwus.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/45175208740.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/xipegibomogapurebire.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/1126093118.pdfIn PDF document text
    • https://matfreklam.com/calisma2/files/uploads/7205436170.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/fopubilifida.pdfIn PDF document text
    • http://ebus.cn/up_file/file/kolagabameretura.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/28963057745.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/xafumabirufotekutoxa.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/92773952781.pdfIn PDF document text
    • https://iasvn.org/Images_upload/files/mevisowipabupavi.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/34812258956.pdfIn PDF document text
    • http://sunway.me/ROOT_PATHuploads/file/060612198310.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142694f21ea5---27764515511.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109131843275458.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/wukimeviko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=carnivores+in+the+oceanPDF 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_off0000b414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB414 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC2B 10380 bytes
SHA-256: 793c5643dce93914c42fa69205bd88b8846312262ec318c5c9dcb96a6a8f4d4c
font_02_sfnt_off0000e3a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A4 17744 bytes
SHA-256: 1c01e249c1072d6ca55e65f5fecebcbdfcac10c8f8d05291c8c4906e5331bd19

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