Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffb5757e79839b0f…

MALICIOUS

PDF

83.8 KB Created: 2021-09-19 01:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: df99898c8db8f2f139bcace1ed5ddad1 SHA-1: 0831515cda5b62548482e7e777b4e2a85fbca00b SHA-256: ffb5757e79839b0f148ba01be0991f019a7b856bf3c2eea2ea2f0fe4b0be9b53
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are linked to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://distriparkbotlek.nl/userfiles/files/91913835691.pdf In PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/bewawisaw.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210909_653603E348AD0E6E.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/vowozutimoganupulemuf.pdfIn PDF document text
    • http://dominopark.pl/public/upload/ckfinder/userfiles/files/58652629258.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc7e975492---64295800320.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/fugakopesekupinu.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/gukaj.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/donegewopozofadimejirutu.pdfIn PDF document text
    • http://atomleasing.ru/media/File/bojikavagorobet.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/80157662288.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/dosajoxekusuvapusuvo.pdfIn PDF document text
    • http://denge.aero/upload/files/83119406315.pdfIn PDF document text
    • http://deforma.it/userfiles/files/gogudomukomositoxaluxa.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/35476007592.pdfIn PDF document text
    • https://giyimkent.formenemlak.com/upload/ckfinder/files/27443538639.pdfIn PDF document text
    • http://greenld.com/userfiles/35977502653.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/83911707810.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/78678752339.pdfIn PDF document text
    • http://naviway.su/upload/files/kazutejok.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/41668640404.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/koresojulofikaxoxen.pdfIn PDF document text
    • https://m3nan973ru5-pa571.com/contents/files/serituzizufoboji.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/jopuw.pdfIn PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/39584491399.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=best+2020+mobile+gamesPDF 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_off0000e387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE387 17628 bytes
SHA-256: 37b10691317f895607d2fd7de424a5624f6a8d6b08d299893919f21026a5fe9f
font_01_sfnt_off0001115e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115E 10680 bytes
SHA-256: a4fccb74367bdc750df635cefe3a4f313b7883ec725d349af3951911c6e8cddb
font_02_sfnt_off000129fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1