Malicious PDF — malware analysis report

Static analysis result for SHA-256 f43bf5ea8759de92…

MALICIOUS

PDF

86.2 KB Created: 2021-09-18 15:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f28c3f73839f4e743d23eec32d76e133 SHA-1: 51ec69e020f42f170cda9810b89beea309d8c63d SHA-256: f43bf5ea8759de92dcc2c39adbdf3d6acfc30d5224aa915595ce0dcf9b1855ec
86 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF that uses a cloud document lure to trick users into opening it. It contains numerous embedded URLs pointing to potentially malicious PDFs hosted on various domains, suggesting a link farm designed to distribute malware or phish for credentials. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://mabuksusu2.com/contents/files/30099373745.pdf In PDF document text
    • http://skonasystems.com/userfiles/file/69174609387.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/zadowebo.pdfIn PDF document text
    • http://it-hair.com/userfiles/gutoxutisivozutukapazob.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/78022419354.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/36626237336.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/dulaga.pdfIn PDF document text
    • https://fq.ua/images/file/24873647360.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/43351946717.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/wimixuwobobedo.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a94568c72---vumado.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/biragajori.pdfIn PDF document text
    • https://latework.cz/soubory/nufaxisutasiliwojite.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/09/12/file/20210912_235239_150.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/xabulevuzejopigudejo.pdfIn PDF document text
    • http://profstil.az/userfiles/file/pezapuwetelujevujidipix.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/82083323821.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/kuzitiru.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/60634289421.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/ranotebuniz.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/75385115444.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/bavarelanisa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+connect+android+phone+to+laptop+wifi+hotspotPDF 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_off0000e97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97E 10796 bytes
SHA-256: 5b7db8e960b5507e5b15454c65cd76c4cd26dcbccc2c1b43560e5d77024f1438
font_01_sfnt_off00010245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10245 18548 bytes
SHA-256: 77c6368f160122e63daf3c8e30cd2d92fb4b19ff769ad6ccaec7e55e225b2009
font_02_sfnt_off000132a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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