Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e91fa862603e528…

MALICIOUS

PDF

82.2 KB Created: 2021-09-17 02:17:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: af2c91eb787ca916f9f9488b5f4cad4a SHA-1: 5b7757db4cb9e8e0f9cd2a4ea894389dad7ba455 SHA-256: 0e91fa862603e52865cd2a983d7435baf7a9f2b8a1a1ff689eaa7325db653840
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to unknown domains, and a heuristic identified it as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. While no scripts were explicitly extracted, the PDF structure and external link behavior are consistent with exploitation techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://shiprapublication.com/uniformkontakt/userfiles/image/files/72256654905.pdf In PDF document text
    • https://rawoctane.com/uploads/file/tamiwigogidakuwu.pdfIn PDF document text
    • https://duongthuy.net/userfiles/file/91480967394.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/kekofovitejadelolakule.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/fulewesirazolatajanuro.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/60706792721.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/79881169080.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/zevurotumajig.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/42549058198.pdfIn PDF document text
    • http://familie-schiecke.de/images/file/vowetesalodad.pdfIn PDF document text
    • https://shidoremicrosys.com/media/momuxijifesilago.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/pexozularonukukexukojikas.pdfIn PDF document text
    • http://precisao.org/files/files/semusalaretekevafov.pdfIn PDF document text
    • http://kfgame.snailgame.ru/upload/files/20210908181745.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16132737a912bc---zefuvibofasigax.pdfIn PDF document text
    • http://inoxbienhoa.com/upload/files/bakurodejivonakuwax.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/nepipakuwatubet.pdfIn PDF document text
    • http://topp.pl/_topp/file/31768479288.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/supuvujimi.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/14952538205.pdfIn PDF document text
    • http://rurisnet.org/images/file/tikuwofatubitubanilaxibar.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/77373314168.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16143bb06b3a1c---77743520109.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/nanorigoz.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia/files/74787353028.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=tokyo+ghoul+manga+all+volumes+pdfPDF 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_off0000d9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E5 10988 bytes
SHA-256: 5f0bde363e66e0471264d02d6a29fa0463c9f21bbf2ce5b7d0b15314fe05d058
font_01_sfnt_off0000f31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B30 18236 bytes
SHA-256: e6c90e90740fd33bf69298ba0174857524c8bd011a58cc0b50a1c6013a3eea2b