Malicious PDF — malware analysis report

Static analysis result for SHA-256 94befff588e0eeab…

MALICIOUS

PDF

81.9 KB Created: 2021-09-21 22:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b04b4988333e465a249741269faaac11 SHA-1: 15d7a6cb256a3579037266ea865d8e93ef0e69c3 SHA-256: 94befff588e0eeab3e2c69174fdbe769f30e41563b65ea0afee68566e4ee10a7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to PDF files on unknown or suspicious domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to host many links on disposable domains. While no scripts were explicitly extracted, the nature of the heuristics and the embedded URLs strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://werkschoenenverkoop.nl/images/docman/files/92918985471.pdf In PDF document text
    • http://apisicul.com/userfiles/files/nopijigesibimijuviw.pdfIn PDF document text
    • http://surestegc.org/documentos/file/47497196602.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/tasenazagapuvimivufafipod.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210919_F8FE743D038724DA.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/40747699706.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/79699067334.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/dutugexunirisolofatudam.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/mifutiropurane.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/bufepejonuwonedale.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/jediloripevisegatu.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/49005394373.pdfIn PDF document text
    • http://gomientrung.vn/uploads/image/files/mabumenadow.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16142bf0f409f4---27447629836.pdfIn PDF document text
    • http://moretonassets.net/userfiles/titokotiwubesizupifa.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/kiwaxowaloxidonol.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/pujep.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/70874128068.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/tijonujawezo.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/64063166413.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/c7dc3b3ac4b7081324cbc7f2aed726f4/81674937930.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/zesevilubar.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/safewurux.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210905_9F2A7DEE4C1850F8.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=god+of+war+download+for+android+apkPDF 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_off0000d146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD146 22360 bytes
SHA-256: 4b6d85e9ec219388d7c46955a2a40347386c3ed2b7d6c4cd4e4c82fbbab6ed1e
font_01_sfnt_off00010a2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2D 10312 bytes
SHA-256: d26c683f7071cce6c7392022a68fbbfbed33f67a9a551302b59374a0c06d53e7
font_02_sfnt_off00012184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12184 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1