Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eb32bb1da99de89…

MALICIOUS

PDF

77.7 KB Created: 2021-09-09 08:29:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: abf782f4e5cc1c4a531c6ceab506e660 SHA-1: 2abdc4ab93dd304de327d39e001b1d852f47e552 SHA-256: 9eb32bb1da99de89e873f41f9d93f3c4a97a316c7e9c5b6a45803b26b249f884
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://queure.ru/uplcv?utm_term=free+credit+card+generator+valid PDF link annotation
    • http://thietkewebbacninh.com/webroot/img/files/tezodez.pdfIn PDF document text
    • http://parquet-cortes.fr/data/Files/97834237567.pdfIn PDF document text
    • http://ecole-belair.com/ecole/file/55362502407.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/keripunezajebodu.pdfIn PDF document text
    • http://www.somdattabasu.com/fckimages/file/rodegifejozepokavagivibug.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130db399f42b---wimokijavunanetema.pdfIn PDF document text
    • https://coaching-jk-academic.com/ckfinder/userfiles/files/48749396557.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/64817922625.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/28533337658.pdfIn PDF document text
    • https://motoralbini.it/files/file/25995822276.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/27627458948.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/katasafug.pdfIn PDF document text
    • http://geodez.com/pliki/file/mifojelofipaluwejodo.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/46093153315.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/sadifizedukuselenuf.pdfIn PDF document text
    • http://thesei.com/In PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/68187930455.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/72870449197.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/petazejozelalo.pdfIn PDF document text
    • https://truckforceone.eu/upload/editor/file/wujutifowazo.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/40784796208.pdfIn PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/kikifojogubezagoxojal.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/70101786635.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/55818790023.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_off0000ce54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE54 16680 bytes
SHA-256: 346f9ca45888a8e99acb0570a379a5d840c2d3235d0f5f7a9548cac11202e8a7
font_01_sfnt_off0000f981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF981 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11198 10420 bytes
SHA-256: d21715f0c798fcdf81c7a831b4e46e105045c4d05bed05f088aa5e025c7ed7de

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