Malicious PDF — malware analysis report

Static analysis result for SHA-256 f073691c3342bccd…

MALICIOUS

PDF

71.3 KB Created: 2021-09-10 11:34:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 487ddad7eb595a77602b460ee78d45f8 SHA-1: 528640923522454f07215250c014e8fed9c62cf7 SHA-256: f073691c3342bccd2e1a02ba3bb96c1b1097436b191ffabfbf9fc1175bc1bcbb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious content. The PDF contains a large number of embedded links, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the presence of numerous URLs and the 'Pdf.Phishing.Trojan' detection strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://tuzvedo.hu/elemek/file/60581871967.pdf In PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/dipulilusil.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/26465047468.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/lemagodibunaned.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/62852251413.pdfIn PDF document text
    • http://freeski.hu/freeski/file/lisejose.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/81555312964.pdfIn PDF document text
    • http://schokozentrale.de/idata/83431248802.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/lesozeg.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/kisilurenulami.pdfIn PDF document text
    • https://longislandinvestmentadvisors.com/nini/userfiles/file/jodoxutisobox.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/sejuvulanewubifojorumosi.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/61776732137.pdfIn PDF document text
    • http://stromzeleny.cz/file/jekagoweketo.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/fupetedageladotolujared.pdfIn PDF document text
    • http://kxxbs.com/uploadfiles/file/a/nibaduxisugowidanuwezuse.pdfIn PDF document text
    • http://alptw.com/images/files/wiwuruzezifuje.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/xugeb.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/muwujagitipekemesanatij.pdfIn PDF document text
    • http://tajilin.com/upload/files/34203500640.pdfIn PDF document text
    • http://apicn.net/upload/files/lijolade.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613504f015a1f---95389150009.pdfIn PDF document text
    • http://villacappuccina.com/userfiles/files/fogero.pdfIn PDF document text
    • http://faptvmedia.com/userfiles/file/xikemananelerabilobelodin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=9th+physics+textbookPDF 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_off0000b7e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7E6 10576 bytes
SHA-256: a35adda19737166b6c56f28c7a80d37e9e754d9dcbe1d8f730db4b467b38e2a1
font_01_sfnt_off0000d013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD013 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE825 15456 bytes
SHA-256: fc9ea0781d70f26e222c1c78b70472d1677c200f1324099630f702afd36c8e6e

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