Malicious PDF — malware analysis report

Static analysis result for SHA-256 71fb3f11c223febb…

MALICIOUS

PDF

90.3 KB Created: 2021-09-20 21:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 638fe085dc807bba2236b7be78aa0846 SHA-1: ece0c380b4d505bccd789b810023e2f48a3d2bfe SHA-256: 71fb3f11c223febb618a744aaacf767ec4b762446f0123c3739d84ac9f2a9891
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or malware distribution attempt. The presence of external URIs and the overall structure indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://oniceh.ru/uplcv?utm_term=queen+of+hearts+2019+full+movie+watch PDF link annotation
    • http://aotwresort.net/ckfinder/userfiles/files/jusamuremobimoxonokiguxi.pdfIn PDF document text
    • http://freeware-software-download.de/uploads/editor/file/silaze.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/memebogot.pdfIn PDF document text
    • http://sdes.in/uploads/fogusibegazijipalawakewe.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/84651249615.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb0e2e547d---negerizarijuwuf.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/48408051502.pdfIn PDF document text
    • http://naturpix.ch/cmsimages/file/63180276523.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/nufazoxopu.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/46875812267.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/wililuxevumazemudewima.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/87244701833.pdfIn PDF document text
    • https://matfreklam.com/calisma2/files/uploads/bomojedufurajidudeneve.pdfIn PDF document text
    • https://serihosting.com/calisma2/files/uploads/9731335377.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/84892736761.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/11711712778.pdfIn PDF document text
    • http://hutnia.pl/userfiles/file/97615525075.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/sorururulen.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/rixusenuvogopipusa.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/84793205750.pdfIn PDF document text
    • http://ebus.cn/up_file/file/gewuzawamobokedil.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/rofipepapojopog.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614547b425d48---fedejofesaxaluruja.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/jaruvajuluvojesizitopu.pdfIn PDF document text
    • 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_off0000fa1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1D 18160 bytes
SHA-256: f0f3023df0f800bd5c779119fcf1ce9af25a30761bca8d3ae2e26b9eda8b4060
font_01_sfnt_off00012859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12859 11372 bytes
SHA-256: 16944e6849ecfdbc831725bfe8a7ddadb7f24413a348f413b688bde9106367e1
font_02_sfnt_off0001433c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1433C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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