Malicious PDF — malware analysis report

Static analysis result for SHA-256 1db643809b3e8904…

MALICIOUS

PDF

80.2 KB Created: 2021-09-13 09:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0f9a975b99402e6de1fd7a105de2e74d SHA-1: d33aa00c4cc8879d9ade05c6e8f91a8e0eac6dc8 SHA-256: 1db643809b3e8904c58274a34e82255b30cc17867cc98a72817a896b34bb089c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are flagged as link farms on disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and the structure of the PDF suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://catamma.ru/uplcv?utm_term=pixaloop+apk+pro+download PDF link annotation
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32650132250.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/favizomerab.pdfIn PDF document text
    • http://yurisolomko.com/userfiles/file/rawix.pdfIn PDF document text
    • http://agt.es/files/galeria2/files/7044080821.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/60595206500.pdfIn PDF document text
    • http://pribatu.lamilagrosaimport.com/images/files/22723171666.pdfIn PDF document text
    • https://yantrasearch.com/ckfinder/userfiles/files/13812100753.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/56907772346.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/64371833918.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/mudijivaforobixe.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17053478004.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/wuketixov.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc55b596ac---tefavex.pdfIn PDF document text
    • http://twilaw.com/files/files/dabavub.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/zunisitar.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/89929303149.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/59911447824.pdfIn PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/ratute.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/zemupemoboromuregil.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/migewew.pdfIn PDF document text
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/vujonuketis.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/42260560418.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/93492114599.pdfIn PDF document text
    • http://tapestry.cz/images/file/files/fevanotozexalopamevememum.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/26743415950.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_off0000d7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FB 17152 bytes
SHA-256: 891c521626374b8d348a47e9da4b0ad5bcc4925df0cabadf2bce3e73e62600d1
font_01_sfnt_off00010470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10470 10268 bytes
SHA-256: 944c05038b287232349ded6b5fc022c6ced165b286f7cc155e00d6299f7fc476
font_02_sfnt_off00011b9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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