Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0e3dee476db099a…

MALICIOUS

PDF

71.8 KB Created: 2021-09-25 03:16:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a27cb43c81c850cbc53b58c425d42763 SHA-1: c0fb793842ce7fe5044c3b8862381fb3aa4dc4f7 SHA-256: e0e3dee476db099a7dcba90fc9fc7663eebc6e620d344eee171395805daab1e2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malicious intent. It contains a large number of embedded URLs, many of which point to disposable domains or are structured as link farms, suggesting an attempt to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a strategy to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://spl-designs.com/ckfinder/userfiles/files/49621787774.pdf In PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/ba4aece08e1cdae2d46616cb34d24137/51972295919.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/xevevinem.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/lakukazodebekowewa.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/nofutadobupagezadal.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/lajezulajozita.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/ravafemujisibe.pdfIn PDF document text
    • https://viceda.com/userfiles/file/lafimufogovigabumumadujo.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/rosasozejusuxuludidukubo.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/xebafuba.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/83869382862.pdfIn PDF document text
    • http://ipllaser.in/uploads/95603660444.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/xenadewug.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/97923138214.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/birudux.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/71885505422.pdfIn PDF document text
    • http://strandedtattoo.com/file/97832989975.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/75297215971.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210925075450.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/gozagozugexifoza.pdfIn PDF document text
    • http://togul.org/sites/default/files/file/wojoragujijewovadafe.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/nidutafepemipuzuwok.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/batorov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=wwe+2k18+download+for+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_off0000b31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB31B 18068 bytes
SHA-256: 2c85d18d9fa3a8b7a3f67b3f2427706d5a1e2c2d15f2f248d511cdf3c54258e7
font_01_sfnt_off0000e118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE118 10632 bytes
SHA-256: 30d4cb164a6bc352adc6d8d3478e7f51a375b2610a7869470cbac23ce17d4ee0
font_02_sfnt_off0000f9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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