Malicious PDF — malware analysis report

Static analysis result for SHA-256 511b20d1e69cedae…

MALICIOUS

PDF

63.0 KB Created: 2021-09-19 04:23:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0ed4b2a00ef2d4066a50a501183df7fc SHA-1: 8e14bd03b53e4a3678d9c69c0c7259a3dea46f4e SHA-256: 511b20d1e69cedaeae5c81505cb0f8cfcc612eca3c2a75f58456b9d886c6b0ba
124 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The presence of external URIs suggests the PDF's primary function is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6960

Heuristics 4

  • 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
  • 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://taiwan-tiaya.com/upload/tiaya_official/files/93957387245.pdf In PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/funanojubabejabitezu.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/kovujizixesonin.pdfIn PDF document text
    • https://noventa.cz/media/files/file/58886735537.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/jitubobomewotesiteke.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/6773396502.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/97241519176.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/ef5e55a29302f5e6f550adba11416697/4300705359.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/42044913259.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f02cd71d7d---kazimimepemakulubajali.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/66422629317.pdfIn PDF document text
    • https://petpetmates.com/files/editor/file/96924256774.pdfIn PDF document text
    • https://phm.vn/upload/files/vofunumovojugisozu.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/45499347802.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/25418163844.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/wekitavudunafef.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/90731719695.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/71515609009.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/21225041008.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/paminuxatowugufun.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/33551809363.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/5269277559.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/rofadaxisojonojimoxal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=hack+app+data+freePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75A 10168 bytes
SHA-256: b339fbcc44e18ca09312a17d1ba79f7d91958a5d937c7b6b14d1abb28d690caf

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