Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccb1f31b9895668f…

MALICIOUS

PDF

76.7 KB Created: 2021-09-14 09:11:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bd25aec482bcb083ecfbdb3d8d4a5bac SHA-1: 83767639218fec27290bb85c70fc859d33a1901d SHA-256: ccb1f31b9895668f2804c382e2b1ce4bfe1ba336e05dce95a5d66491f8e1466c
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a critical ClamAV detection for 'Pdf.Phishing.Trojan', and numerous URLs pointing to PDF files, indicating a phishing or scam attempt. The ML classifier also strongly flagged this PDF as malicious. The embedded JavaScript likely facilitates the malicious functionality, such as downloading further payloads or redirecting the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 7

  • 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.
  • 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 https://maribon.net/app/webroot/files/userfiles/files/nuloviwudurevepigokam.pdf In PDF document text
    • http://chapelguild.com/images/usr/raserazetaxewabepupubu.pdfIn PDF document text
    • http://roocenter.ru/upload/file/50636949419.pdfIn PDF document text
    • https://clove7.com/userfiles/file/30226605419.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/dufur.pdfIn PDF document text
    • http://rld-carbon.com/file/vebagavovulidefon.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/fbvooqr7vsb8ts3e5u4fr9ujsn/fuginutotapilakuduvi.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/59749444973.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/pipakuku.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/binujowebaj.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/tirupafigewej.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/12509051538.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/91196174977.pdfIn PDF document text
    • https://comfort8889.com/upload/files/mutoligepakogosunevun.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/21456969100.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/62958847384.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///59148848902.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/54372712788.pdfIn PDF document text
    • http://svarovani-tig.cz/userfiles/file/kisipevarevizelelogovi.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/9924652128.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/zipotutomeforagulo.pdfIn PDF document text
    • http://cloverdiamond.com/file/pejuxesujosifibukigiguter.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/lojiruzumazoxokel.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/winetoripan.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/bitilodupezapuxezig.pdfIn PDF document text
    • https://incense888.com/uploads/files/202109122246021961.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/bigixepafipibabojelu.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/34194246732.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=room+smash+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_off0000ca8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8A 10084 bytes
SHA-256: 11396e442a32e68d02a1c1d06c3af9ff0f8db73c92aef4e97aec0f89abdb94e3
font_01_sfnt_off0000e101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE101 16912 bytes
SHA-256: 04187e2f331c059237ac690f2e69ececc1af00d1c4d7afb4c13d0dcee0436e41
font_02_sfnt_off00010cca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1