Malicious PDF — malware analysis report

Static analysis result for SHA-256 7186aea049645303…

MALICIOUS

PDF

69.4 KB Created: 2021-09-23 10:10:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8cf0e23bcd5e42c1a2f586135f172bc9 SHA-1: 419f77a31637d17a9ff463c7b744f289384aaa9f SHA-256: 7186aea0496453034aea01f0c34be3d2b005c4aa2bd319dad102b15655d9a66d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pixomot.ru/uplcv?utm_term=virtual+root+apk
    • https://devcons.org/uploads/userfiles/files/42839032935.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc00480c54---28145800951.pdf
    • http://merrygoldholidays.com/ckfinder/userfiles/files/pemefarufukonazixake.pdf
    • https://xtrafitcoaching.com/www/images/files/6417214101.pdf
    • https://gesema.com/UserFiles/file/28690131803.pdf
    • http://clubselectionvoyages.net/images/file/45279368234.pdf
    • http://ceraunavoltapizzeria.it/userfiles/files/12543963409.pdf
    • http://kibunajcc.com/ckfinder/userfiles/files/tojixu.pdf
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/kibegoseboxujibum.pdf
    • https://amthanhanhsangchinhhang.vn/upload/files/gipetororomukafubu.pdf
    • https://dom4m.de/userfiles/files/24116841181.pdf
    • http://lubrifianti-auto.ro/files/file/josujelewagisepik.pdf
    • http://skene.es/userfiles/file/11314188105.pdf
    • http://oecschool.com/userfiles/file/getopavizenuzedis.pdf
    • http://eau-msu.ru/ckfinder/userfiles/files/23601535240.pdf
    • http://www.julietlandau.com/fckeditor/userfiles/file/kuzewikitevuwajenekelifus.pdf
    • http://dylogistics.com/userData/board/file/85514346609.pdf
    • https://skatrip.com/basefile/skatripcom/files/57674666091.pdf
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zixugalupaji.pdf
    • https://franchisebusinessadvisors.franchisebrokerwebsites.com/broker-site/files/files/vaboxelarekuwujukoxizekax.pdf
    • https://www.prshots.com/ckfinder/userfiles/files/pibebinijesarezeponikasu.pdf
    • http://montazenabytkupraha.cz/files/file/38335531534.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/f5f419c740cab0d82770a943a53aa852/vomuwobisujenijov.pdf
    • https://dtd.com.pk/ckfinder/userfiles/files/45883153854.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b2f8.bin
ad0b8c35d35414d4ce31070bf5bbb2d02622ab9c6475d268d38224aa19aa2715		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F8 10004 bytes
font_01_sfnt_off0000c944.bin
e44421996614737f868212ad652aaee3a8dad35f436a829fcb7c45c67fa5098f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC944 15428 bytes
font_02_sfnt_off0000f09d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF09D 16792 bytes

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