Malicious PDF — malware analysis report

Static analysis result for SHA-256 c46616847180fb8f…

MALICIOUS

PDF

75.0 KB Created: 2021-09-18 14:51:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: db492818e483a96e1ade58d936709e0c SHA-1: 4282135658aa96b7196eab5e4f9f08773cf1f767 SHA-256: c46616847180fb8fec079c0313dfc8f9e556fda49617da1ce26028b9766d5c87
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://pistant.ru/uplcv?utm_term=where+is+recycle+bin+in+android PDF link annotation
    • http://miwon.com.vn/app/webroot/uploads/files/wobuwoziwajekabonoveruzi.pdfIn PDF document text
    • https://gogift-it.com/userfiles/files/sifurovegewusemuguje.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/38336580694.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/jilolonajeziwinogule.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb8ce17254---xanexobujoradibikupufe.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/vugumixugoguweper.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/40134655920.pdfIn PDF document text
    • http://ssp.by/var/upload/linojagibagufutomiren.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/161407a59e8137---71326114079.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/60332289021.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/sipotonawatikalanug.pdfIn PDF document text
    • http://otczenacts.com/media/files/70877886944.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/zemumimodavim.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/22866472572.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/8790935404.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/duvilazugud.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/72364698773.pdfIn PDF document text
    • http://areopag-group.ru/sites/default/files/uploads/babevafilirutubew.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/vodegujusisi.pdfIn PDF document text
    • http://lj-group.cn/upload/files/76870190394.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/27031236117.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_off0000c181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC181 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD993 17420 bytes
SHA-256: b6084166aefa7b601bb14f8ba6a3fa185f46fd81c098b747b189c5ba33aad06c
font_02_sfnt_off0001069e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069E 10616 bytes
SHA-256: a3993b37b2823e0e20c9a0c9aa732f17adacdddf1a9f1a75321b8ed7deb8a0ec

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