Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6d36d71d3fef34f…

MALICIOUS

PDF

78.4 KB Created: 2021-09-09 17:43:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 835791ce4693019d698339531d8e8ab2 SHA-1: cd56b8f5179373754bfdd4705f2bc2e401d49db3 SHA-256: d6d36d71d3fef34f61aa75105f91c56b276f4018ce2f6b0dd70172574f214c08
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 0.9958

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bartonsteel.com/tony/barton/ckfinder/userfiles/files/81425867305.pdf In PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/59267005553.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/47311242171.pdfIn PDF document text
    • http://centrons.com/uploaded/file/19702068376130301fe1038.pdfIn PDF document text
    • http://cegled.varosom.hu/userfiles/files/69212487051.pdfIn PDF document text
    • http://blgjad.com/upload/files/79460905291.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/87612285852.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210908_093826.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/73447981922.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/xelogerafujevuwexesak.pdfIn PDF document text
    • https://gkatsov.com/userfiles/file/20784177906.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132b3a378dd0---rasubep.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/83638664452.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/16995916009.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/subinakidol.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/semunibanoputere.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/33555081118.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/79219371473.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/82050289327.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/fixobuxugifemavu.pdfIn PDF document text
    • http://qlionshousing.ca/userfiles/file/rivalodexepolobewewepif.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/11300324382.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/85348629824.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=ml+bang+bang+download+pcPDF 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_off0000cae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE8 19372 bytes
SHA-256: 1cc7102d341886633fbd864f997efeb5efaaf5018a986088ea926847f2adf51e
font_01_sfnt_off0000fd64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD64 10316 bytes
SHA-256: 363fe7ae975f13eadbf16da361381d2231a72c1e2f35d80ce2ad706cc62e1f15
font_02_sfnt_off00011459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11459 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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