Malicious PDF — malware analysis report

Static analysis result for SHA-256 2efe87aa9d78a5cb…

MALICIOUS

PDF

82.6 KB Created: 2021-09-08 18:19:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2329b274e409b90fa561741fc07b4c94 SHA-1: 907bb8fc10a1440016a30af553970a9ae58e6158 SHA-256: 2efe87aa9d78a5cb9413302223c3c24e710de91f3e27832eb3b28d3371bf2b9b
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and utilize UTM parameters, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of many external links suggests an attempt to direct users to malicious websites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://synerhu.ru/uplcv?utm_term=manitowoc+undercounter+ice+machine+manual PDF link annotation
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136fd4885299---xawasifalivugadosanitis.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/wuxodejirusegifubof.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/rawudujijigipobumotuvovo.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/84666561076.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/36877464884.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/vorasewu.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/luwolixukikewax.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/tijorenifudiliz.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/jamumibaxodufopo.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/zumavagunubaf.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/23801215533.pdfIn PDF document text
    • http://fructusartis.com/i/File/19477779659.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/29676999257.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202109/file/210902144329983090ahh92pm3lc88.pdfIn PDF document text
    • http://autoachtercamper.nl/userfiles/file/benuvofopomo.pdfIn PDF document text
    • https://www.luxboss.com/ckfinder/userfiles/files/95614666726.pdfIn PDF document text
    • http://krallarintavugu.com/upload/file/wukinowilabu.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/tovajowugumal.pdfIn PDF document text
    • http://getvisa.ru/images/File/86471687192.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210908141057.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/96517053526.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_off0000def5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF5 10644 bytes
SHA-256: baa0dbe58eb7015d83257772b6d82b1d0383b83481cecb5a25e0bde280967c07
font_01_sfnt_off0000f72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72B 17564 bytes
SHA-256: 40bfe07cf2e20bb25c65ac152c5a05de273d4389e43d92e6b41ef65f6a5646b9
font_02_sfnt_off000124cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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