Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7e952da1d3713b0…

MALICIOUS

PDF

79.5 KB Created: 2021-09-15 16:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 57ec58ecce9d4b8fe72c4daf2f5e2b3f SHA-1: ef6ff72c1e6435ba89e743fb7c38854f67448752 SHA-256: d7e952da1d3713b057a37de576a6137be6c7a869ca630f9a64e9c5827bdb8311
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://majedalkarkhi.com/pics/file/28999973949.pdf In PDF document text
    • http://xmzhj.com/UserFiles/file/5892726218.pdfIn PDF document text
    • https://toscanafantastica.com/userfiles/file/dibovizefimaluvobixado.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/22422239486.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/4867220558.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/15418184590.pdfIn PDF document text
    • https://shidoremicrosys.com/media/43183416835.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/lusebisuf.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb88650438---3338362138.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210914_E8829FD98D28976B.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/lidijedixume.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/84114859145.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/nubesudesar.pdfIn PDF document text
    • http://dodogs.ru/sites/default/files/file/gowemunavinokavowojupu.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/xalomavekevoru.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/teguvokep.pdfIn PDF document text
    • https://kamarkosong.com/contents/files/xoposomubevi.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/bukozulanom.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/kekebudowabifewal.pdfIn PDF document text
    • http://lagrupacio.cat/file/61872794793.pdfIn PDF document text
    • https://inprovitmexico.com/ckfinder/userfiles/files/3919564409.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/lusakolodamurisoke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=back+up+iphone+to+itunesPDF 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_off0000d4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B9 17100 bytes
SHA-256: 45d207655983c71c2ca77e704b4a2ea552d93408e9095e54ce3174dc3cb04977
font_01_sfnt_off00010061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10061 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11878 10568 bytes
SHA-256: a829fb1346f69077c5cbb1090ab1f87f2a25b012206cc6fe737878bb4a6c65a7