Malicious PDF — malware analysis report

Static analysis result for SHA-256 49091e4ab52880e8…

MALICIOUS

PDF

80.6 KB Created: 2021-09-16 02:54:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9a8c1732bf811fbfef1c15f8d0dcb902 SHA-1: a8da6a740dc3605ae81e32fe74cf782e63dd64c6 SHA-256: 49091e4ab52880e874acc92f7e9887bf509abd642d8759554372d2e97521ed0e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful sites. The PDF structure itself appears to be exploited, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://medvor.ru/uplcv?utm_term=logo+esports+maker+pro+apk PDF link annotation
    • http://terhautz.com/upload_files/files/kelesexamowiramurego.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/68959557833.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/xoxutumux.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/vimitor.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/xilinexuvokofu.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/duwodumotuxapirap.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/20362635978.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/pesoparulexagi.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/vujitegodapunapudamo.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/dizegugexizisokuvu.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/33464293154.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/bovoj.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///32631364520.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/16652139548.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/67177095617.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/loxudunufisepezemi.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/21184751117.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/69715037173.pdfIn PDF document text
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/44164238232.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/q512qahg4hho7nesktkljmud9g/88877232228.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/sulimexezogatuz.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/99408210167.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/15815370023.pdfIn PDF document text
    • http://newbiiz.com/upfiles/file/sugezidumesatedijerexax.pdfIn PDF document text
    • https://igraonica.me/userfiles/file/muxabodomif.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_off0000d7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E8 17244 bytes
SHA-256: 6cc9a875a4291b10a9930d84ddabd1d17742fc31be7091843f1d661323d18ef0
font_01_sfnt_off000104df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DF 10400 bytes
SHA-256: 0fdb58019911702b20eaa20ea6a9910365d490088da79b4c1c146ed03cbba077
font_02_sfnt_off00011c87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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