Malicious PDF — malware analysis report

Static analysis result for SHA-256 0625a93c540907b4…

MALICIOUS

PDF

94.5 KB Created: 2021-09-11 19:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 78c8b4e5bcb85a82d5520b7d1a2676a9 SHA-1: deb5198cf75a791afa9c9bb8bdafa15237c477e8 SHA-256: 0625a93c540907b44f5d1e7b0c17168c5f2d062552bdca96c87f0ed82c69ca07
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm with numerous embedded URLs pointing to potentially malicious content, suggesting a phishing or SEO poisoning attack. The document body was unreadable, but the presence of many distinct hosts and the 'utm_term_redirector' flag strongly suggest a lure to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 5

  • 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.
  • 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://lonniestireandauto.com/nbloom/fckuploads/file/limojomijojijagoxu.pdf In PDF document text
    • http://hyunsin.net/userfiles/file/nokirinabuxus.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/99105578464.pdfIn PDF document text
    • http://chanhbon.vn/media/ftp/file/fikejupenuwetar.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/raxilozemitobov.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/87a62557c7838e3041e70544e333ae92/xijej.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/watufujej.pdfIn PDF document text
    • https://sleepthai.com/piceditor/file/kixuxusegan.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/demafakefataju.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/demisugime.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613947c2afea8---89780869564.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/muruwuwomanegane.pdfIn PDF document text
    • http://393citizen.com/upload/files/91070069093.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/jesoz.pdfIn PDF document text
    • http://jyczgj.com/UploadFiles/file///2021090215002463.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/72557766796.pdfIn PDF document text
    • http://tencanpowder.com/d/files/88064247684.pdfIn PDF document text
    • http://vucert.vn/uploads/files/sorojenadexofipifuka.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/kabupises.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20219313872232.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7c69f2660---rulipe.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/89986081643.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/10657195038.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=cps3+emulator+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_off000108aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000120bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BC 19624 bytes
SHA-256: 167cd7148b21819a8a0841c8cca51aba5a0d5bff9098ba0833963f54bbf15dbc
font_02_sfnt_off00015350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15350 10948 bytes
SHA-256: a7d7cc34317292f228e30246d4ab53004a682e2bff8914f9a3461eff97a4d1b6