Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f4eb79cdd66bcc6…

MALICIOUS

PDF

81.7 KB Created: 2021-09-11 22:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: d41823cc648eb41900a7064393f96b0e SHA-1: 69248ebd055659e73bb506e61f6b9bd8040de675 SHA-256: 3f4eb79cdd66bcc679b4a81fc45f1cdc174bc75c040420287bc56334254203fd
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 4

  • 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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342243f37b6---bevut.pdf In PDF document text
    • http://justsayhi365.com/uploads/file/95080368915.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/besakasole.pdfIn PDF document text
    • http://gardatrans.com/content/Files/kamunev.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e9e45894f---jujezuxom.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/lasokusagoxuged.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/xabewedarepetizanobenuda.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/pemimuvojufujekifaj.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/wezokitoluvezufogese.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/jubirut.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/87470547581.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/39478549519.pdfIn PDF document text
    • https://eurosan.pl/user_images/file/31806700442.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/81233455781.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/vewosebidizonijabosugabu.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/61212192506.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/binisinuduvikurowuf.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/45792812930.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/65887894967.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/jubode.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/20826384813.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/vozofukujefivupajib.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/34969610187.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/37296606487.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=redmi+k30+ultra+global+romPDF 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_off0000d809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD809 18204 bytes
SHA-256: 625978c3eee735032f1bb103fec53988aa7fe8c03785ac45151f37e39d4e2791
font_01_sfnt_off0001078b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA2 10992 bytes
SHA-256: fe6f72b5c90b0813af8b8b79d08d8d89d3cce40a6239946abaf22c8b24a64826

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