Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd4227c43898b7d1…

MALICIOUS

PDF

71.8 KB Created: 2021-10-02 15:46:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1d40250e02b236e83a4c4258ee077c7b SHA-1: 9f9ce713bc56d7d20507c9536a1a73cdd2e40ec9 SHA-256: bd4227c43898b7d17f41a4e90de360d50d39742de579dcbd8de5a37dacf6641d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://inwebjor.ru/uplcv?utm_term=matlab+hex+to+binary
    • https://illinoisfiscalpolicycouncil.org/app/webroot/userfiles/file/fomoxobawo.pdf
    • https://telorgabus.com/contents/files/tumemekimewedidov.pdf
    • http://mobil-tech.com/files/2708791188.pdf
    • http://ticketsperiodico.com/galeria/files/27693986565.pdf
    • https://33mobility.net/uploads/files/rilezibinu.pdf
    • http://tunecharts.com/userfiles/file/58158442221.pdf
    • https://www.anoregmt.org.br/ckeditor/ckfinder/userfiles/files/jusafutavapokepajuz.pdf
    • http://3t-t.com/User_File/UpFile/file/20210913202239_MTk3MzU4NzYzMzY=.pdf
    • http://arredamenticucinesiciliane.it/userfiles/files/kejupezebanavofuleseg.pdf
    • http://happyorderfood.com/uploads/files/jaditomewobenaba.pdf
    • https://premium-house.uz/images/file/66582540023.pdf
    • http://studiozoppini.com/userfiles/files/zubimegikuwalireka.pdf
    • http://sensitiva.fi/UserFiles/File/numunabumisudekiwudi.pdf
    • http://intertexmedical.com/userfiles/files/76110881665.pdf
    • http://xageunion.com/userfiles/file/83152273770.pdf
    • http://weddingdove.tw/uploads/files/202109281925507471.pdf
    • http://pnmanagementsolutions.in/uploads/54006723077.pdf
    • http://becucci.it/userfiles/files/60289774799.pdf
    • http://reklamaopole.pl/userfiles/file/7643134491.pdf
    • http://xinshifm.com/userfiles/file/reruzovavu.pdf
    • http://kaizenlife.com/ckfinder/userfiles/files/lopopakivameverunozigi.pdf
    • http://www.binghan.my/userfiles/file/kofemarakuxikisoxitudumet.pdf
    • http://sinorarechem.com/upload/files/8220242127.pdf
    • http://webbolt.fono.hu/data/editorfile/vakisi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b662.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB662 16792 bytes
font_01_sfnt_off0000ce74.bin
5e11c06827aad736aeab1a061ff9dbea320814364d8ef48d9bc98fdb54983b2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE74 17244 bytes
font_02_sfnt_off0000fa28.bin
7d0aacce7c1e35dcf01706198b316088c3d6e3c5ea0e7ed9a27fb588031eece1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA28 10384 bytes

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