Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ed2ce9a13905084…

MALICIOUS

PDF

81.9 KB Created: 2021-09-16 06:21:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b5098a58fd68b7de3134f36ed22cd104 SHA-1: 4bce0aa0e0e334e831a89ef1247de1c513d95bcd SHA-256: 0ed2ce9a13905084e859af9760545ca4c17276e8cab85786a6978b9b571d67a7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and a high number of external links, many pointing to disposable domains, strongly suggests a malicious intent. The ML classifier and ClamAV detection further corroborate this, flagging the PDF as malicious. The embedded JavaScript likely serves to redirect users or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://inwebjor.ru/uplcv?utm_term=introduction+to+abstract+algebra+nicholson+pdf PDF link annotation
    • http://autavrabek.cz/obrazky/file/kowabeme.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109030142368317.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/4735890487.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/livovem.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/zezafizolasef.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210905010524941.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/97541132772.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c437f2c425---18883593416.pdfIn PDF document text
    • http://rhondachem.com/d/files/24424209121.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/donikepaluruzodaxev.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/69495649498.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/sidesanosoziwiwal.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d107bd731---77516160823.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/55586159842.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/79311183513.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/zepijepuxeruvolodopom.pdfIn PDF document text
    • http://nanoservice.cz/upload/file/50975169091.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210912040856.pdfIn PDF document text
    • https://ntc-container.com/upload/files/67507404307.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/89053803298.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/felotefol.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_off0000da48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA48 11092 bytes
SHA-256: 9246d437fd6d1fe523f0fb66e3c36859dfd8c767083ad104defb64bc2ed1d043
font_01_sfnt_off0000f3a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A2 17804 bytes
SHA-256: d13bec82d769d585144bbcadf276feb639f17b257215836f7b38dc4f893bc035
font_02_sfnt_off000121f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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