Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec2dff97a0ba465e…

MALICIOUS

PDF

77.8 KB Created: 2021-09-25 14:00:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3ce2b737b0760ed79ba82413172a799f SHA-1: 7f2b3ae22fd06f5e7d9bf6e0d8edfa3ab78dd0ef SHA-256: ec2dff97a0ba465ee77063fc37bbac9f89b8862c27caf3bb8f2716cfdb88d242
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, with a high heuristic firing indicating it functions as a link farm on disposable hosting. The ML classifier also flagged the PDF as malicious. While no scripts were extracted, the presence of many external links suggests an attempt to redirect users to potentially malicious sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 4

  • 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://angelascanu.it/uploads/file/59058864492.pdf In PDF document text
    • https://songiadahoaian.com/upload/ck/files/93034703843.pdfIn PDF document text
    • http://elfast.ru/userfiles/file/woweno.pdfIn PDF document text
    • http://laguna.piyawatgroup.com/images/files/jodivivujet.pdfIn PDF document text
    • https://spyboarcams.com/files/vanixadugirekinuxarokix.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/161468c995dbf2---79698358438.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/56197645403.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/vevezuduwatonemukebomi.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/jesujar.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/0cac98e312cda133b6103469a62f258a/levufituzul.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/sedupebono.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/zeletegu.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/41412647606.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/noliragezutugewokodoviv.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/15325564693.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/tajejafojume.pdfIn PDF document text
    • https://ventadeterrenosagricolas.com/userfiles/file/bajijufufamefo.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/50040272040.pdfIn PDF document text
    • http://cserepakcio.hu/xdata/file/44254786556.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/wulisop.pdfIn PDF document text
    • http://salwex.hu/file/89227516456.pdfIn PDF document text
    • https://rtaadmin.mrv-educationservices.com/content_file/files/zolomekebini.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/91728399817.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=jmeter+outofmemoryerror+java+heap+spacePDF 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_off0000bfa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA1 21632 bytes
SHA-256: 48d8504497d45f8be525d65f4b4794d123e4377e13c70c47a6288fa18dc45200
font_01_sfnt_off0000f804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF804 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001101b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101B 10904 bytes
SHA-256: 31b64b0c2334d5c747ff295a2fb0ed009f7417ecf96b9817a6ba830f436054dc

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