Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca70fa07d91bbdc7…

MALICIOUS

PDF

75.5 KB Created: 2021-09-23 05:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7b2a6e1603084f001bca7a8328791e20 SHA-1: dcef69373b5b48954f58117f443baf0f1c5d25be SHA-256: ca70fa07d91bbdc726de5034c2d92ac160249884b52b9613d0d70dc00ac3e485
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. The PDF contains numerous embedded URLs, many pointing to other PDF files, suggesting it functions as a link farm to distribute malicious content. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment used to lure users to malicious sites.

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://fittbikese.hu/files/file/sotuxedemuwigelipisinades.pdf In PDF document text
    • https://ginniglobal.com/uploads/file/fawifuragil.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210915104755.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/rejaledewanujozuwidit.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/ditobajudas.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/womatubefi.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/28618365350.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/ccd6f229820fbaa4d35d5d911b979fb8/vugudivewonuvoruwut.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-2/20210902123746227508.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021091209564156.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/51357203500.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/lovexumisekinijega.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/mamumuviwuwetofemujizo.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/xavirerupo.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/begunajekejatixamobus.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/nivatelojower.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/97323728866.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161486e4e23e05---98161754350.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/latukisug.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/91417637923.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210901080133.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/govodukuzeji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=outsource+search+engine+optimizationPDF 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_off0000be1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD631 10960 bytes
SHA-256: abe6f199546de3e6119fa2602d822ed9e8c2fa00a52d23456e349c5dc86abcd6
font_02_sfnt_off0000ef89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF89 18164 bytes
SHA-256: 0f3406e0e4b69741e902fdcb4c055acf2d2d855b9126d455d58b4f14f2c4b303

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