Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bf820e7ddce608b…

MALICIOUS

PDF

69.1 KB Created: 2021-09-29 05:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1ac4a10790c5da2a5e8b85f3e4cc08d6 SHA-1: 7d594ea2599bfcc03c71cd1f10149d907e779fb2 SHA-256: 8bf820e7ddce608bcb03f0fc76998034d3d6a88d52b55406439efd4e0c22c6a5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and it contains numerous embedded URLs. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which is often used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://crysiq.ru/uplcv?utm_term=how+to+make+a+video+your+wallpaper+android PDF link annotation
    • https://unitytradefze.com/ckfinder/userfiles/files/90559992645.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/68488420136.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/wagoxajofila.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/75571444968.pdfIn PDF document text
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/kodanijoroma.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/baxufereri.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/86c1c3b6c71f40c9df30bbcedfbd7cec/meladawodubumilirakijij.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/57342681816.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/fovito.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-24/20210924085339537841.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/madibexejug.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/90135001782.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/46017006528.pdfIn PDF document text
    • https://alwaysthesame.pt/site/upload/file/tuxadupopopepufukujidin.pdfIn PDF document text
    • http://d-innovation.com/upload/files/20646046086.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1614024b862601---beribegisinipimotemesivut.pdfIn PDF document text
    • http://sinosteelcode.com/filespath/files/20210917175813.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/zevulivedivibarojanet.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/19307490955.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/jujelek.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/kagubedaxoku.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/39164269044.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_off0000afc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D9 14932 bytes
SHA-256: 47ca5df96dac103ea53734f10001705a7d4e55d06690273bc29d09a7d9c6322a
font_02_sfnt_off0000edac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAC 10832 bytes
SHA-256: f39fceae8bef395a19361a205d1b356924be7f93e2611242875370b2c3d8fd71

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