Malicious PDF — malware analysis report

Static analysis result for SHA-256 52994f685555626b…

MALICIOUS

PDF

86.1 KB Created: 2021-09-12 05:25:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c790ba8faacda889ed324b8dc0472a48 SHA-1: 3a8def8e1435d3e42ed052a9d20d5ad8bac3b08b SHA-256: 52994f685555626bc3594728a4d6d0e925e0eded8a3d816e2b91cb0559f8211e
74 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to suspicious domains hosting other PDF files. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggests a malicious intent to manipulate search engine results or distribute further malicious content. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 5

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://realestatespoznan.com/uploads/janafanafokaro.pdf In PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/27818261036.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/85706869761.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/36511808524.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/73931371632.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/62835844035.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///18544312430.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/85793170682.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/26642305445.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/43702598794.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/98341734623.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/2688086938.pdfIn PDF document text
    • https://hongming-eco.com/userfiles/file/bajevigub.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/rdcc53l78j6dti2lp7hkttsgcj/tixuforulawitavopo.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/sajujegijowom.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/93915504347.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/87111715405.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/joliw.pdfIn PDF document text
    • http://cbstav.cz/file/83272910451.pdfIn PDF document text
    • http://phanvienphianam.com/uploads/userfiles/file/zazimesakufelev.pdfIn PDF document text
    • http://drironcat.com/images/file/sufuvafaninexeli.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/deredobibumarajuniroguj.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135b2764f118---binagokupiwofiwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=stunt+simulator+multiplayer+unblockedPDF 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_off0000e6c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C5 19076 bytes
SHA-256: 7877c532c288218e5f2cdff7d837cace3f65c3c626b1f0422a55ee9aea94a192
font_01_sfnt_off000118f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F6 11196 bytes
SHA-256: efa46d508c8582fea7f3c6e18bf619c8244bd37558b1581328acc2fa64d65b64
font_02_sfnt_off000132f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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