Malicious PDF — malware analysis report

Static analysis result for SHA-256 2587d8f6533cf070…

MALICIOUS

PDF

90.5 KB Created: 2021-09-19 12:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1bfd4c1fb3827d707e33add82ac1d2e0 SHA-1: 39d40345c1f507319e19a8656abdaacfe0bcc8ff SHA-256: 2587d8f6533cf0705b62c6ee3f5b25e13dde22c3e9725e36c0db35667cd0f453
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing attempt. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the presence of many external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a high likelihood of malicious intent, possibly to redirect users to exploit kits or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 4

  • 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://oniceh.ru/uplcv?utm_term=21+online+movie PDF link annotation
    • https://vinniescustoms.com/userfiles/files/darizasexuxizuv.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/94815054377.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/fodusatunisagapaxut.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/bomabovopewu.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/gonoro.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/jaxukeda.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/13382268776.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/nafepovonebavididex.pdfIn PDF document text
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/wivujelilisavusugijata.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/70842126121.pdfIn PDF document text
    • http://goldia.cz/data/file/vozadebatatanuzamanegoxus.pdfIn PDF document text
    • http://cascad-trans.ru/files/18728801135.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/13340367213.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/04/gitarevek.pdfIn PDF document text
    • http://sushibelovo.ru/files/fuxiletafapoko.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/66495475304.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/monotezeboxebuzabaverupag.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/tagib.pdfIn PDF document text
    • http://navrattan.co/userfiles/file/93466012906.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ef81a1e50---41544900572.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/93649456249.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed812ca2c4---kapivasusifijusiwo.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_off00010266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10266 9880 bytes
SHA-256: 12ddef3a98ff43abed582d8bdac1ca9a9ab1f6f7e89609bd0880b681d4a8163a
font_01_sfnt_off00011820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11820 17228 bytes
SHA-256: 4e6ecbe85584c859088a17af0dbe1657d4717df775a92ff022ea5f99052af11a
font_02_sfnt_off000144db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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