Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8995073a510c477…

MALICIOUS

PDF

75.7 KB Created: 2021-10-03 09:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7350d1ac41fd5b5172fb3a866360f915 SHA-1: c6181441dafffb21d25921a6b22bc4e94c6d327d SHA-256: e8995073a510c47794f12914e87753952d647242e453e96c63fef50678b259ca
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to form a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://coretry.ru/uplcv?utm_term=barbecue+on+the+river PDF link annotation
    • http://msdoubrava.cz/foto/images/file/togiv.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/xusaza.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/50208607536.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/salibakuroxuvabolawu.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/kigumi.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/xogeva.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/xojawirefaxuvipexuj.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/kopulujipalorijasub.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/fererobarolizomas.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021922150199772.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/1689770489.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/mixixufejukime.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/11105531511.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/47590584112.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1615409054707f---82427891925.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/kupilapaziwogiwefepogozus.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/zulakubakikivifulet.pdfIn PDF document text
    • https://hotlinepro.in/admin/userfiles/file/sawezibewodijuto.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/dajipusajejonivulo.pdfIn PDF document text
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/32729382500.pdfIn PDF document text
    • https://hediyelikhanem.com/calisma2/files/uploads/83746196118.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_off0000bd2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD2C 20088 bytes
SHA-256: a763bf6dbfc3d2b28e052b17d95a5fce958bd92568f8f1cecb0fa8a8777a347c
font_01_sfnt_off0000f19f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19F 10472 bytes
SHA-256: f74e69e83278b9ea7973da5721c69eff29abf252feec177f2df97bf91a583c21
font_02_sfnt_off00010965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10965 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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