Malicious PDF — malware analysis report

Static analysis result for SHA-256 4689c3e57238301f…

MALICIOUS

PDF

66.5 KB Created: 2021-09-23 15:13:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e9408cfb29f53631f77d768b907b6960 SHA-1: 52c194f879fc08162cc9cb50685de624e277d62b SHA-256: 4689c3e57238301f2e8b869ba2221e87dc539c81408b5ac148fa484c62d56a06
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external links, many pointing to disposable domains or potentially compromised sites, suggests a phishing or malware distribution campaign. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating the document is designed to host many links on potentially untrusted hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5268

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://propactionvehiclesuk.tv/userfiles/files/2569318219.pdf In PDF document text
    • http://back2wood.de/userfiles/file/26400680047.pdfIn PDF document text
    • http://104450wp19.agentcentrum.com/userfiles/files/4714756488.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/77981811890.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/43393614824.pdfIn PDF document text
    • http://bodybybodyology.com/ckfinder/userfiles/files/42632093165.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/rurezesitanatagerarutabeg.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3bf6d5dd2---pisubekisexisuzox.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/dujus.pdfIn PDF document text
    • http://yildizteknikelektrik.net/resimler/files/44009940069.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/31433029958.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/vevisesurinas.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210901094818.pdfIn PDF document text
    • http://ahknchem.com/upload/files/64745929422.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/21685382440.pdfIn PDF document text
    • http://kasand.com/userfiles/kavojit.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138361bd5294---geketibupozomezo.pdfIn PDF document text
    • https://kaunas.cvzona.lt/resources/img/files/dusaf.pdfIn PDF document text
    • http://kbcsisa.com/upload/fckeditor/file/94406691502.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/58858493584.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/tajobufipagur.pdfIn PDF document text
    • http://siddharpeedam.org/userfiles/file/In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=find+a+formula+for+the+sum+of+n+termsPDF link annotation
    • 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_off0000aff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC807 10696 bytes
SHA-256: bf9da2ded94f4dba319f353f47df0d31881d193c559705abcc606b14bddd5f93
font_02_sfnt_off0000e04f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04F 15444 bytes
SHA-256: 475a30f63432cca118d78136748895aa4da85cb16f99fc61d32d772b0e0e48fd

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