Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ad5d44e61e51222…

MALICIOUS

PDF

85.1 KB Created: 2021-09-16 00:47:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 509d037a8c32a48829eeddd0946afac1 SHA-1: 7008ccd44cea04c082210189e6690918f02e269b SHA-256: 9ad5d44e61e512223f10abc0177e835e0c18b9a625dbc0c2aec4e723315cc40e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on potentially disposable domains, indicating a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://benevolo.it/userfiles/files/xirojaxopu.pdf In PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/62354854923.pdfIn PDF document text
    • http://sdds.be/userfiles/file/wubusedudakij.pdfIn PDF document text
    • https://km2804.com/ckupload/files/80841744840.pdfIn PDF document text
    • http://dailygiasi.com/uploads/userfiles/file/74884206864.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137817de832b---78994163839.pdfIn PDF document text
    • https://csn-alliance.com/data/files/10296381130.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/87866055367.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/87154848340.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/96273293548.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/gaxeviwep.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/91221082635.pdfIn PDF document text
    • https://777mto.org/contents/files/14814067531.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/pepafukodexugazexe.pdfIn PDF document text
    • https://netkat.in/ckfinder/userfiles/files/67353385085.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/simotutepapu.pdfIn PDF document text
    • http://stefani.cz/fck/file/4544920380.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/pubamererexepevi.pdfIn PDF document text
    • http://peak-experience-europe.com/images/blog/file/22635391792.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/pabetawutokujuzon.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/43238810853.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/riwus.pdfIn PDF document text
    • http://zima.italie-ubytovani.cz/data/file/41107043211.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/35975240726.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/dunifimosa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=marvel+realm+of+champions+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_off0000e62b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3D 18516 bytes
SHA-256: 04594081d74bcbd8c3b40704fe9b0cf60b61f512037fe0c748733b8c0d2d69eb
font_02_sfnt_off00012e40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E40 10800 bytes
SHA-256: 27368e57ed55924e2227e47e67f153657ca2403dccf24a7398a5415985cba9fc