Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebcd2deb69f22978…

MALICIOUS

PDF

84.7 KB Created: 2021-09-16 23:22:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c4057563adc50105a7eb5e389d1eb39d SHA-1: 5e040961c10e8aca20fd6f69a716efafd5fa4fc4 SHA-256: ebcd2deb69f22978a09fcb33cf5b1cbfed99ed2379b193810e98e5b1c14b5f35
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, with one heuristic specifically identifying a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the presence of multiple suspicious URLs points to a campaign leveraging external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/tukidudemije.pdf In PDF document text
    • http://imobilestore.de/userfiles/file/93157558638.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/bunexunixikoxo.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/jerigifas.pdfIn PDF document text
    • http://potlista.com/file/files/tixumirizituta.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/fozuravataxego.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/vasivepufulaxikuwokikew.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/32881867098.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/23580437507.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/kekiluzevasej.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/lakona.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/mimadamigasuzejovogular.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/43127342393.pdfIn PDF document text
    • https://hklh.vip/data/attachment/file/luzimoxekinorabewupu.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/89335239288.pdfIn PDF document text
    • http://qianshunqs.com/admin/upload/35155225337.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/ludepagegelowokadutiloxul.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/pasumuvipubamerozavijul.pdfIn PDF document text
    • http://ruresept.ru/files/file/wupitosiwu.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b657e8b018---20406524168.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/19319227408.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/4515567961.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/92068085164.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=wonder+woman+1984+full+movie+free+onlinePDF 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_off0000e4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D4 17812 bytes
SHA-256: e1bef8dabf2b77e918f4f2d06c8ec04b8cfd8842ea188b1d5daf8c1d2a836110
font_01_sfnt_off00011327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11327 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3E 11000 bytes
SHA-256: 542d1311860721aa5ce7feb8eddfd0e9328c8d889eee45cdf2aac4830906eb7c