Malicious PDF — malware analysis report

Static analysis result for SHA-256 e438c10fb4019115…

MALICIOUS

PDF

72.9 KB Created: 2021-09-17 01:08:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7d49644e5b1ef42fd18581da957248dd SHA-1: cb4417a2d0f1613d90d5ac88b1d47ac5973ecd39 SHA-256: e438c10fb401911550f9510adf1d101393ed8b803d30b150bf78be064864c378
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to potentially malicious domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm strategy, suggesting the document's purpose is to redirect users to external sites. No scripts were extracted, but the presence of many external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://www.iieng.org/editor/ckfinder/userfiles/files/roruguti.pdf In PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16136ace3735c5---nomuwoxujuzewedamabar.pdfIn PDF document text
    • https://widerbet.pl/userfiles/file/nasofeniribov.pdfIn PDF document text
    • http://vrtaspol.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/18413817644.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/boxufasafimuzetad.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/rizenewipidoge.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/70436460570.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/26593682576.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///26397466801.pdfIn PDF document text
    • https://interno-kazan.ru/upload/files/11539957237.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/79022426979.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/94738201161.pdfIn PDF document text
    • http://www.pvvc.cz/files/wukapolawamawuxa.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/gipusilonusiwubapaje.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/19887513374.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/sikem.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/kifegifedazadozazo.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/lesuxiritajozevowux.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613498b09f60b---fepakopu.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/43502029536.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210914062654.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/wilaxewowe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=tactile+wars+apk+modPDF 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_off0000b71f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB71F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF31 17384 bytes
SHA-256: 54b873e92a7675f8ba610d92e041fceb4093a5427f4e441f6139241fa735c99a
font_02_sfnt_off0000fc25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC25 10712 bytes
SHA-256: e61eceba985534e973bef54f050da2bf9f9b123fe8bbdb220d0126b61f9f12b1

Open this report in the interactive analyzer, or submit your own file for analysis.