Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc280ee35b09756d…

MALICIOUS

PDF

70.5 KB Created: 2021-09-10 06:37:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 71fbfbb4c9f8a2c95e90dbbe1158185c SHA-1: 3cdf07592b9e961208d10b3be394e092d49a869d SHA-256: bc280ee35b09756d9e2c42ba9f2d23a35f192e27ac71b9013418b4526132fefe
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags the structure as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://artasedanasingaraja.com/uploadfck/file/39701901686.pdf In PDF document text
    • https://paron-rebondir.com/uploads/files/36807684278.pdfIn PDF document text
    • https://masukpt1.com/contents/files/64611198402.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/zikegarigapilesedefig.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/11950290484.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109091505489070.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea008734ab---nedifapadakasikob.pdfIn PDF document text
    • http://acunambalaj.com/adenoto/upload/files/papopipot.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/jatefevomokijir.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/kamuzokakugimasa.pdfIn PDF document text
    • https://tivirtual.com/userfiles/file/semigiripumov.pdfIn PDF document text
    • http://chinalabware.net/d/files/54524553699.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/14106796232.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/tezepejo.pdfIn PDF document text
    • http://ducnhua.com/upload/files/dimepaname.pdfIn PDF document text
    • https://red-adlay.com/upload/files/30901972787.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/52844928173.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/64039415886.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/muvonilu.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-4/20210904200430599142.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/21719202943.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/mobusewisizadebu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=cartoon+wallpaper+hd+download+for+android+mobilePDF 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_off0000b56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB56C 10852 bytes
SHA-256: 3f6fbae860ff59993d3dc446b64ee2a0e04b3927a38ae7d0fdd08f0c80d0eb68
font_01_sfnt_off0000ce10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE10 15320 bytes
SHA-256: 5c74dfe84a20d4c3884065f64e272aa2e3871e73231b6e1e6f674b3ca0d876c2
font_02_sfnt_off0000f497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF497 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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