Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7c9cdb2c598d695…

MALICIOUS

PDF

73.6 KB Created: 2021-09-13 20:32:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0d756f8060a1535a7d129d2b778e266a SHA-1: 88d82cb137b1b0249335b3b766d960c65b7eb8b4 SHA-256: d7c9cdb2c598d695cebbcbc4499df0e561db183f7a19a6d8adeff4aca3d8c6eb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely to distribute malware or conduct phishing. While no scripts were explicitly extracted, the presence of many unknown URLs points towards a malicious redirection or download scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://streathamtaxi.com/survey/userfiles/files/41061523314.pdf In PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/10553050854.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109071420038911.pdfIn PDF document text
    • https://vjlabor.pitscovn.com/uploads/Upload/files/fumadojujopeziseboxosefel.pdfIn PDF document text
    • https://rm-parketi.si/uploads/81289105947.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/97110657878.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137698b455f6---wazavelomepuwitipos.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/nutokabo.pdfIn PDF document text
    • http://seasonmediagroup.com/pic/file/xitezoxelogedotonedox.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/41322696667.pdfIn PDF document text
    • https://yensaovinastar.com/media/files/67740387770.pdfIn PDF document text
    • http://satcomlink.com/userData/board/file/46640191960.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/25362305581.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/57176512876.pdfIn PDF document text
    • http://newshop.jp/archive/file/40072782421.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/71066337610.pdfIn PDF document text
    • http://tce.vn/imagesflashupload/file/34094882607.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/raxiza.pdfIn PDF document text
    • http://mitroc.com/userfiles/file/gujanipobuwipaw.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/253215328.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/94977324007.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/13117669608.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=transfer+excel+to+pdfPDF 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_off0000c032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC032 15924 bytes
SHA-256: 6604d573ba0e8977a17cc6a6260475f3f1efd707e1474a686d8995210a98bd57
font_01_sfnt_off0000e8ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C2 10588 bytes
SHA-256: fa3f9d842af3ebe9c2839aa9dd305ed9d5efd4a83f07ad4d23bb925605a52071

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