Malicious PDF — malware analysis report

Static analysis result for SHA-256 d443cac811c75df7…

MALICIOUS

PDF

80.4 KB Created: 2021-09-10 20:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3d5e73df93c9d6758018b68457f21004 SHA-1: 336276e9daae2af5df6263560fb0d72d4ed7e6bf SHA-256: d443cac811c75df7ff2bd4f1793f8545cd0f8d877b337ea517792ba3b1e19768
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect users to potentially malicious content. The presence of PRC/3D content and ML classification further support its malicious nature. The embedded JavaScript likely facilitates the redirection or execution of further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • PRC/3D content in PDF high CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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://coretry.ru/uplcv?utm_term=8+ball+pool+mod+apk+download+2020 PDF link annotation
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/96921869076.pdfIn PDF document text
    • https://conrays.ru/f/data/78880360036.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/29905126337.pdfIn PDF document text
    • http://fygl.net/uploads/file/060506487668.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/5816450327.pdfIn PDF document text
    • https://tpk-m.ru/files/file/degenu.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/tufivutorodolitovirunubuw.pdfIn PDF document text
    • http://labonscafe.com/userfiles/vipowukuboletiduzopob.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336a3086b26---30141741528.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/tavafosufedumujopaf.pdfIn PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/waxos.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1631124398.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///44132488425.pdfIn PDF document text
    • https://wittnebel.dk/file/pogitezakak.pdfIn PDF document text
    • http://wmsone.com/eimages/file/potegejosubik.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b3a2e8232---87708783336.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/zufimudepo.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/kakaba.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210902055422.pdfIn PDF document text
    • http://ned.ru/uploads/files/vukupanarekas.pdfIn PDF document text
    • http://aptwash.com/userData/ebizro_board/file/lokedogafaxegi.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/bedezujiwedevijoluzilo.pdfIn PDF document text
    • http://flirdining.com/uploads/files/pitenagoresedokumitobe.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109062328032904.pdfIn PDF document text
    • 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_off0000d70e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF20 17452 bytes
SHA-256: 81d32ac9e843cee1f0a5f2f8c5577b359696f342dc5507f37519c8d493b97baf
font_02_sfnt_off00011bf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF9 10632 bytes
SHA-256: e8eec5505915865bac805d844bea4be4e063ca4a837100afaa1cc2e711089dc5