Malicious PDF — malware analysis report

Static analysis result for SHA-256 8679a1b206eb5ec6…

MALICIOUS

PDF

82.5 KB Created: 2021-10-05 00:09:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 190f0e25445cdfa7bbe6ea2d0374fbca SHA-1: 6ab05e4fe4595f3d7e8a9a1725063b39e6eb97cb SHA-256: 8679a1b206eb5ec6c3b974e8f71b443f7f713f91f9801d9b773a278d5d842b5c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to external domains, characteristic of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery. The file's structure and numerous links suggest it's part of a broader campaign to lure victims through various deceptive means.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://queure.ru/uplcv?utm_term=stardew+valley+how+to+fish+nintendo+switch PDF link annotation
    • http://ampletrekking.com/userfiles/file/jizawitatijujinetosavo.pdfIn PDF document text
    • http://1666-3668.com/attach/userfiles/file/621175864.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/25459038002.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/24556778562.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/jetud.pdfIn PDF document text
    • http://tercovci.cz/files/file/kesezilamuremujofun.pdfIn PDF document text
    • http://kunbot.com/upload/files/67344991130.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613962fc8bb33---62471982151.pdfIn PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/lotifunilizovajasow.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/matifotes.pdfIn PDF document text
    • https://geloracinta.com/contents/files/30442350099.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/19577985001.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/fa94cf9facd5cc99ef0655767661d12e/zufilab.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/sodoguwenarovas.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/77589908783.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/zomevuwufamabizorataduna.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/kexezuloxamubobo.pdfIn PDF document text
    • http://kprmk.pl/userfiles/file/mitudukijosofudibanufa.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/waximavobemek.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/33566555661.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/xujawixigarikekijodawowe.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/40141531238.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_off0000ddce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCE 17320 bytes
SHA-256: 6ea5cab916b81c90e551657584d872ed68293e86efa391d03f4354ea2b484cbc
font_01_sfnt_off00010a82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12299 10912 bytes
SHA-256: a160cb2374d24839508086c408e3229d86c570f946dff998c3730962afd48a13