Malicious PDF — malware analysis report

Static analysis result for SHA-256 54ab24a9f4bc84d1…

MALICIOUS

PDF

68.6 KB Created: 2021-09-27 23:11:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2ca1c535bc23b450edab6a0debc0e77b SHA-1: 3155914211be71b0af2740f0f4f7e1793e448dec SHA-256: 54ab24a9f4bc84d13b90b49152187dd2105b97d402469ff0b72d434b4cedfb9e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features numerous external URIs, many pointing to potentially malicious domains, suggesting an attempt to redirect users to phishing sites or download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://keyday.ru/files/files/lejunevowujidivivumij.pdf In PDF document text
    • https://mabuksusu2.com/contents/files/navano.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210919105026.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/50207758093.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/61188771119.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/91815930672.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/1653137577.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/66587764032.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/ruvawofojelujiwepokoluwa.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/86123353157.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/zivokulipagojiloruxije.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/xogujilub.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/163064914195813279.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/lowujisezadili.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/bizevefozit.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130822709740---fotewanirudem.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613556f44c405---28657111389.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/lodal.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109261900274858.pdfIn PDF document text
    • http://becskeicsodajo.hu/admin/fck_upload/file/defisijuzunozi.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/6057611443.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/33675068819.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=what+is+accessibility+settings+on+androidPDF 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_off0000af38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF38 14424 bytes
SHA-256: a248cac2e4bb1fd0fa8e566f5f8b25b9bb8f1f99ef3eba1e6abfa42d3eae322a
font_01_sfnt_off0000d368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD368 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7F 10896 bytes
SHA-256: 3df3fb6cd41d83a377ac7c464ad1d9a66ff0dd76457923d9a4db2ef4b7c52f48

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