Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e101555e5e8fa0b…

MALICIOUS

PDF

70.2 KB Created: 2021-09-13 09:43:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 623c8574e828c8697d9d8ef384a5f00c SHA-1: d6d63ef8aa2afaa44fc0843e038ff9fc35f7ef32 SHA-256: 8e101555e5e8fa0b5b6cb0d9aae6381cb6d74cdadf4996d2df84e13253033aca
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a machine learning model and ClamAV, indicating malicious content. The presence of numerous external URIs, many pointing to PDF files on disposable hosting, suggests a link farm designed to redirect users to potentially harmful sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic specifically highlights this behavior, and the embedded URLs likely serve as the primary mechanism for this redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://synerhu.ru/uplcv?utm_term=prototype+game+download+for+android PDF link annotation
    • https://suacuachuyennghiep.com/uploads/files/57572571218.pdfIn PDF document text
    • https://people11people.com/uploads/File/94268423992.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b259027565---78454339720.pdfIn PDF document text
    • http://lemma-studio.pl/userfiles/file/pomosotawetid.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/52315980134.pdfIn PDF document text
    • http://artospace.com/pics/file/vejotipus.pdfIn PDF document text
    • https://rwd.webseo.tw/upload/files/netofim.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/27988417126.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/44865946075.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/13420093379.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16137d0f233204---nulunikodigimopi.pdfIn PDF document text
    • http://sin-hua.org/userfiles/mimabajakafuwol.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/61420692715.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/wenef.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/togutepoxojizav.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/pevulesagu.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/62057139475.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/50654264313.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210907060642688.pdfIn PDF document text
    • https://tsolisp.com/files/file/fuvafarenabuboji.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/robuzajafeb.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/zuzisejizixekizulomit.pdfIn PDF document text
    • http://a-pluset.com/userfiles/gopuxozunakotifexadek.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/watafadejetajalobagapugim.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/89266140508.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_off0000b452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB452 14976 bytes
SHA-256: 82394876a42eda5962e18de7c8f02ba72dd4697f2402fd03cfcb9454efb65c42
font_01_sfnt_off0000da27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA27 10876 bytes
SHA-256: 2f4fce68d2ebfa4c23408b9fd81858a258b47d16a9f81202c4386b3bd2439ac0
font_02_sfnt_off0000f31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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