Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ec30b073e7bd0e8…

MALICIOUS

PDF

79.7 KB Created: 2021-09-17 04:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d754d9846c9b51192d7d43be6d3ea736 SHA-1: f1a9b0908e3cf22d1083f352b3d2eb034c5158b5 SHA-256: 4ec30b073e7bd0e81749dca1c994f6f0a9e243b3f5f034e53e7da629292be273
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The document's structure and URL distribution suggest an attempt to manipulate search engine results or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://onlineadda.net/ckfinder/userfiles/files/52898060291.pdf In PDF document text
    • http://glavis.biz/userfiles/file/55928355742.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/64653974060.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/21119741521.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/gedegidarapofefapugaras.pdfIn PDF document text
    • http://faptvmedia.com/userfiles/file/53510876795.pdfIn PDF document text
    • https://jucariicopilasi.ro/app/webroot/files/userfiles/files/bobenazerufebetader.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/28993947986.pdfIn PDF document text
    • http://farmandari-sarvestan.ir/images/news/files/99262195222.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/xulawesuwenamumuw.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/92578591253.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/rubimixubevenanapogomela.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/320023425.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/48221597878.pdfIn PDF document text
    • http://www.moyekolodin.com/files/vafenotipafif.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383a5f1e252---38315839805.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/66982956554.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/9664948414.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/tiguriluvetowemeliluzum.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/lomijevivutujatisenagom.pdfIn PDF document text
    • https://khanikango.in/file/libamavipemoliwajowodiw.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335cebbf0da---73127554674.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/21607866155.pdfIn PDF document text
    • https://tmtteks.com/files/gabazarafemaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=change+icon+name+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_off0000d2a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A0 18144 bytes
SHA-256: 9ef5c931ab3d3fb656348bb9c2a9b87f2f5034c8750eb070ad9a74c3e0eccc75
font_01_sfnt_off000101be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BE 10536 bytes
SHA-256: d46d23178640f30ab51caaea1d4f490f6abb6b2a5d00b9c62ee3b72a2a5207fb
font_02_sfnt_off0001194b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1