Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8450a5e68ab4b08…

MALICIOUS

PDF

71.0 KB Created: 2021-09-29 03:57:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 678f17c58086c5268fa412ce03ae8c54 SHA-1: dd26ccd221c5ea85bb9faeda0372e72a8236f8f8 SHA-256: f8450a5e68ab4b08c885a6e73c0f99d6ed12b80deca5e0cef0f49ea0fb5172dc
126 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm. One heuristic specifically identified a 'PDF_SEO_DISPOSABLE_LINK_FARM' pattern, indicating a likely phishing or malware distribution scheme. The PDF_URI heuristic also identified an external URI, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146bdffc2495---loxem.pdf In PDF document text
    • http://csc0451.com/userfiles/file/20210928064833_tl4sco.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161314125d9c7a---40803470373.pdfIn PDF document text
    • https://waxparadise.pl/userfiles/file/rajoraxaxu.pdfIn PDF document text
    • https://rotitelor.com/contents/files/refolafubukoxagimizepurix.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109250504578001.pdfIn PDF document text
    • https://terracell.pt/images/file/93202228005.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109040703557789.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202108311938297357.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/fezubowexos.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210905_452DCD1D459E51C6.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109160858449072.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/newutililorogurimawuvulad.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/55246052911.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/58393245208.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/64309171682.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/66598104097.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/36689862985.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210908142030.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/46178945846.pdfIn PDF document text
    • http://fructusartis.com/i/File/51596956406.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/64054361274.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+open+emulatorPDF 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_off0000b0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C8 18140 bytes
SHA-256: 83b988abc625e80edaced06d513c801ed81218d80c06f4074fdc891510181f03
font_02_sfnt_off0000f75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75D 10332 bytes
SHA-256: f5b9ae146d82397a319336697f15af7153052d3281daa4102342a8fc81a856c4

Open this report in the interactive analyzer, or submit your own file for analysis.