Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7b3e67c34994e85…

MALICIOUS

PDF

79.4 KB Created: 2021-09-09 03:06:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e4030994688638e5d9976da4a2ab3452 SHA-1: d5183b1d0e35d4ca9c23cfade0db074728535246 SHA-256: a7b3e67c34994e853cf89b08202d228ea4e4e93a3bcd92505bdcaa2aac7b8928
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to link farms and disposable hosting, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics confirm its malicious nature. While no scripts were explicitly extracted, the presence of external URIs and the link farm structure suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://duszek-lasu.pl/userfiles/file/janusovetedenipaw.pdf In PDF document text
    • http://ozkayalartrans.com/userfiles/file/vosuzoworinorufakagatexo.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/sikedarexevor.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16135b40194c32---pewosatarolakutu.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/59215327528.pdfIn PDF document text
    • http://indemo.pl/Image/files/talatodi.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210904004527.pdfIn PDF document text
    • http://dinhvi5s.com/images/newtech/files/94472490883.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/96666198669.pdfIn PDF document text
    • http://hrudolf.com/userfiles/gaxiwubadinowo.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/geremubizodibag.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/banidawokit.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5456941086.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613940be3fa06---dezufoleluguvusimij.pdfIn PDF document text
    • http://juentai.com/userfiles/files/wupenigutupi.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/xugazi.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/fiwal.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81889920178.pdfIn PDF document text
    • https://playworkspartnership.ca/sites/default/files/file/32555049886.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/35905615972.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/92015182521.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/zezizinikevosipejifexola.pdfIn PDF document text
    • http://kd-council.com/upfile/files/69048975049.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=javascript+es6+pdfPDF link annotation
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/27948247507.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_off0000d1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F8 17768 bytes
SHA-256: 158870850f8e5feb48f856ad750c646752d6d71e4a3b279d48f798ae02d37e0e
font_01_sfnt_off0000ff93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AA 10568 bytes
SHA-256: 31db0dd0074c7bd76a2f4ceb81ab65e804347618e31730cf330c57e293a9ccb1

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