Malicious PDF — malware analysis report

Static analysis result for SHA-256 c472d4a7a0d66195…

MALICIOUS

PDF

82.7 KB Created: 2021-09-19 07:35:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b4c041701916f1ce8fbe80f0aed53b29 SHA-1: f87cce9b5a1c3b5548e072956e2c13abf941229d SHA-256: c472d4a7a0d6619527c5f371945386374737384b8f990f677e8da23c4cc0b793
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this malicious intent. While no scripts were directly extracted, the nature of the URLs and the ML classification point towards a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://jatyn.cn/upfiles/202109/file/1631152949.pdf In PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/jajizugijanopopepalewagaf.pdfIn PDF document text
    • https://shirbandifelt.com/userfiles/file/vinelib.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/buzekip.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/bovuzaxamak.pdfIn PDF document text
    • http://fohow77.ru/upload/file/48552797076.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/89418270521.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/relotesibexi.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/jilupoxisuta.pdfIn PDF document text
    • https://sharedsynergy.com/userfiles/file/22863784296.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/tativovuzepegafital.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/40607249537.pdfIn PDF document text
    • https://ocw.tw/uploads/files/fafoguxikofon.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/pumoxaxexitanadejibazol.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/76628506807.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/rugosumutexukozoxe.pdfIn PDF document text
    • http://mskgroup-spb.ru/upload/file/muvepinigisapiruxokelidu.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60821048331.pdfIn PDF document text
    • http://europavloeren.nl/siteimages/file/35045449441.pdfIn PDF document text
    • http://nmways.com/uploads/fckupload/file/50985860950.pdfIn PDF document text
    • http://tradotel-riviera.com/file/dewegofoso.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/96031527720.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/2331184604.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140fb2f708e4---vowutomurudabavobe.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/mofaxunurixegukogelugu.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202109020336526338.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=looney+tunes+dash+full+game+downloadPDF 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_off0000de84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE84 17740 bytes
SHA-256: 2c5a951089755ca87a6dfc831ff67350e767126159b5095f7ac42eab1cd54820
font_01_sfnt_off00010c20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12437 10868 bytes
SHA-256: cdba6aabcc017b6a1beb28da81f444538afb8524dd28af7f0627b728c9596814