Malicious PDF — malware analysis report

Static analysis result for SHA-256 189da8e3a9d484bc…

MALICIOUS

PDF

74.5 KB Created: 2021-09-12 15:04:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f4a129960e4805afcfb638229f9c80f0 SHA-1: 6c6031c875195c799afb377b7252442d285bccbf SHA-256: 189da8e3a9d484bc5da9b6e237c7248b5a2b04ffd8838fb14d64146cac31306a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript, flagged by ML classifiers and ClamAV as malicious. It also contains numerous links to external PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The presence of embedded JavaScript indicates an attempt to execute code, likely to download further payloads or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huichem.com/ckfinder/userfiles/files/94738941698.pdf In PDF document text
    • http://cyclad.org/UserFiles/file/97765969212.pdfIn PDF document text
    • http://prompol.com/media/file/72616303682.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/82235799328.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/xoromokib.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/5426910865.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/gigamuzebuforidavewumu.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/16689088686.pdfIn PDF document text
    • http://splogservice.ru/content/files/wazasosezavuj.pdfIn PDF document text
    • http://tainghe.vn/userfiles/file/28302835291.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/modizewa.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16133a4504500f---kuvedoji.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/79719186267.pdfIn PDF document text
    • http://allivecoat.com/userData/board/file/tenusunubakijajiso.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/29744319222.pdfIn PDF document text
    • http://domuran.pl/files/file/72998389383.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/15410970157.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/86655203522.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/35879111791.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/86366355452.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/32172662772.pdfIn PDF document text
    • https://loctra.net/userfiles/file/gijubep.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/razarasigitelevugalenik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=install+opencv+android+studioPDF 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_off0000b6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF03 10624 bytes
SHA-256: bebfac6c07704a24c8c8651df571d9eb773a90e6e90cd366674d72a057da996d
font_02_sfnt_off0000e773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE773 20332 bytes
SHA-256: 946dd57314253615a10c962d04d3eae6aece15c114ac17e98ddd7df5ea612acc

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