Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e9ef065f78dac43…

MALICIOUS

PDF

77.9 KB Created: 2021-09-18 17:25:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 19b5238f68fbc826504d436560725fc0 SHA-1: d8832b056a72c7a7943d9d2061ad91888abc6feb SHA-256: 5e9ef065f78dac43f0575cc289760a37b1b4657e9b1ab648ecc2f4d77976f112
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, many pointing to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 5

  • 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.
  • 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://nuovartea.eu/userfiles/files/miziwujigezuwozota.pdf In PDF document text
    • http://studioarchterreni.it/userfiles/files/vodupuxawaporufiru.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210902083204.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/16365137239.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/32023419622.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161428b0e53848---63795289733.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/wudotodo.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/puzijupegetasibubidavogaw.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/zawulepejopigofe.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/dukagud.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/nikax.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/munivo.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/dafogovenegoputugajumapa.pdfIn PDF document text
    • https://bloc-immo.com/images/73813236880.pdfIn PDF document text
    • http://asustainable.com/global/file/dazij.pdfIn PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/79861682117.pdfIn PDF document text
    • http://lumieye.com/userData/ebizro_board/file/53467493667.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/62561396399.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/36057764429.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/fapuzuvozidotuv.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109020243399726.pdfIn PDF document text
    • http://dalba.net/other_files/File/90151227256.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/6ep5djjmchj3b08t16s8pbd6oq/24382780047.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/29516162069.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/31480825561.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=sex+video+call+mod+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_off0000c7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E4 19328 bytes
SHA-256: 741a90c0fc231751642fb384484fddc825e6f748725654b544afd8d48667380d
font_01_sfnt_off0000fa82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA82 10540 bytes
SHA-256: d4809fe48012589dbd5556a69d46cc2d87649843dbcaa40cd5337aa80228a22f
font_02_sfnt_off0001128e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1