Malicious PDF — malware analysis report

Static analysis result for SHA-256 62ef4af2ad475c3b…

MALICIOUS

PDF

68.6 KB Created: 2021-09-26 18:45:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c2077353d7771decb511af9d57ad689b SHA-1: c9f880bc34e6d1ddf59095cc6693edb19d3b866f SHA-256: 62ef4af2ad475c3bb929200877ab0b99f19b521e9d5a9d7e59ca1e045acf7b60
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, suggesting it functions as a link farm designed to redirect users to potentially harmful content. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://archism.ru/uplcv?utm_term=the+walking+dead+free+streaming+online PDF link annotation
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/271d5dfee77d44c0d70495d76492a68b/vigusijegaluzapavewete.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/wizup.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/57644620374.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/120409558650.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/35468151625.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/28987948981.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/69518694890.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/35506275323.pdfIn PDF document text
    • http://ziva-muzika.cz/files/file/78027771241.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/petusapamujisunusijokun.pdfIn PDF document text
    • https://bunexim.dascalita.ro/app/webroot/files/userfiles/files/fisefa.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/54119294595.pdfIn PDF document text
    • https://spacio.hk/attachment/file/25864340697.pdfIn PDF document text
    • https://termoformat.md/img/files/14978417571.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/darelovekerivakesu.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/dujutapiroxivuxuwid.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/velobobelupu.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/buvolako.pdfIn PDF document text
    • http://keacg.com/upload/files/18234442697.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/49248056097.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_off0000ae0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE0F 14872 bytes
SHA-256: b6b7fc4dc73afc511b2eb7afe9bd6ec93cc984fd19ef6cb11424cfb569c49444
font_01_sfnt_off0000d39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD39E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB5 10940 bytes
SHA-256: 87f84f8a7567ccf90ff4432fa37707532f74af3ccc6bf8932202706090f0ff5a

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