Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f888c8bb4ed938f…

MALICIOUS

PDF

75.7 KB Created: 2021-09-24 10:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 503f43487f06658643263e6c80d80ad5 SHA-1: acea83e823befe4b59856659a8b268b9f3afb5b4 SHA-256: 9f888c8bb4ed938ff53d8ece6383c9c472b471ed38922280b0a6c76651d6606a
126 Risk Score

Malware Insights

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

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 to direct users to phishing or malware distribution sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, identifying the document as a non-clustered link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://lecostationery.com/files/file/41897250098.pdf In PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/jadew.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/fatirivit.pdfIn PDF document text
    • http://lagunarent.lt/ckfinder/userfiles/files/90107753691.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/magokedapadikavejiki.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16135953847acf---sotobajivamomi.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/piwirawafox.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021090117035554.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161468874849a9---55361949878.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/41940146594.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/razorunusezovonexogir.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/komuvalaveloxopuz.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/lewomawe.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/xikap.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/17920570321.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/zevedave.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/xujuxixeralamazenulosowi.pdfIn PDF document text
    • https://blv.by/upload/editor/files/wefutedisogimak.pdfIn PDF document text
    • http://sunway.me/uploads/file/240047072352.pdfIn PDF document text
    • http://zussobrance.sk/grafika/dokumenty/96540758532.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/10102308199.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/letilozade.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=percy+jackson+4+graphic+novel+pdf+free+downloadPDF 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_off0000c18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC18D 17232 bytes
SHA-256: 0748fd794f2d686a28974cb27c636a2732c532b9f8918217e14f996a9c1fbd12
font_01_sfnt_off0000ee86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE86 11368 bytes
SHA-256: 615641c7aa4488883bbd02b2e01ef90f3b9f0f149e1327a38d4a3d6f13868b54
font_02_sfnt_off00010919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10919 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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