Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0a8d6df392c23ee…

MALICIOUS

PDF

85.2 KB Created: 2021-09-11 22:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 47d528f4a965772380b552e56157b976 SHA-1: 63d5090ece24227939af0caaa2396e262cc0fbfc SHA-256: c0a8d6df392c23ee4ed53ae34aca061539538758fe14cb714f6f2dc06f05c9e7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. Several heuristics indicate this PDF is part of a link farm designed to host malicious content, with one URI directly pointing to an IP address. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://hoatuoi360.vn/uploads/files/65044406550.pdf In PDF document text
    • https://anup.bo/images/files/61412763498.pdfIn PDF document text
    • https://crmsaas.dswip.com/ci/userfiles/files/59349138884.pdfIn PDF document text
    • http://medtravel.pro/images/hand_uploaded/files/48682383217.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/94085741053.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/42567657630.pdfIn PDF document text
    • https://greenways.at/userfiles/file/bedenipekavujer.pdfIn PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/sagopufagogu.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/pagite.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/ce486b4528f62f62da1ed8c80db90954/vigusonofurisiwosujevad.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/36872120854.pdfIn PDF document text
    • http://maulich.vn/attachment/files/vovug.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/kanobifak.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/madulixat.pdfIn PDF document text
    • https://radio-clipa.ro/userfiles/file/85667079962.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/17047869116.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/61198488434.pdfIn PDF document text
    • https://dm288.rs/slicice/file/45372504518.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/48803373808.pdfIn PDF document text
    • http://kes.org/upload/editor/files/766683267.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/161353ff482c0e---55801564021.pdfPDF link annotation
    • http://twtime.com/uploads/files/202109090744201466.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=free+open+sourcePDF 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_off0000ea21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA21 10044 bytes
SHA-256: e5e7b827f606fdfdca40236d1d896dab6fcc204c077a0e23f0c0597987d90eb8
font_01_sfnt_off0001008a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008A 18332 bytes
SHA-256: 6f464e14a9cff7eae54f17547b455b4bd78af8a60bf633f811c04bcbcfd104cd
font_02_sfnt_off00012f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1