Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cc67afaab9e8989…

MALICIOUS

PDF

84.2 KB Created: 2021-09-09 16:16:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 87901a962bc4afc52abff1d033056ab5 SHA-1: 58ec7a71dfc01edb0b88133709901ae163240b6b SHA-256: 5cc67afaab9e89898f1be1aa03c815066d31232ed535ef2bc26bccc0042501d3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and 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 0.9860

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://jinistudy.com/_UploadFile/Images/file/29788171477.pdf In PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/34892694558.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/zimavovig.pdfIn PDF document text
    • http://oilspecchem.com/files/tolovevuzasetiku.pdfIn PDF document text
    • http://traviet36.com/upload/files/tepumu.pdfIn PDF document text
    • http://tjtvina.com/Upload/files/88731687243.pdfIn PDF document text
    • https://lomasdelaweb.com/userfiles/2008.09/file/bunirevulogaropumuxiratu.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/58046827534.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/56502523.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee50fc4053---juzonisorabedolovepo.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/55052623896.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/50607024825.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/midedisowejimudejo.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/xofisozomosijug.pdfIn PDF document text
    • https://vhcvietnam.vn/ckeditor/images/files/13933246750.pdfIn PDF document text
    • https://sapsda.com/SapmaUserfiles/file/76610020996.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/94451463457.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109050804381834.pdfIn PDF document text
    • http://voyagevietnamlaos.com/hinhanh/file/1672014269.pdfIn PDF document text
    • http://brenderup.ro/mm/file/liponuwulofisi.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/77522999092.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/91194734621.pdfIn PDF document text
    • http://grupophi.es/uploads/files/44721750860.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/rivetesodogu.pdfIn PDF document text
    • https://nileagriculturalindustries.com/file/zuxamux.pdfIn PDF document text
    • https://xn--90ah6akb9e.xn--p1ai/f/file/wojedamivi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=phonetic+symbols+chart+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_off0000d4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0A 23212 bytes
SHA-256: d42c93f2882e30a9401d564c3469a0090434b8fbbff6e9b79a58a1a183b29b6f
font_02_sfnt_off00012988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12988 11140 bytes
SHA-256: a16a6f98d4734a51fb08b71fd56178f7d98a35831552e26178f61447c7b01a11

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