Malicious PDF — malware analysis report

Static analysis result for SHA-256 a93feab699c279e2…

MALICIOUS

PDF

79.6 KB Created: 2021-09-13 12:07:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dbe36b36add9e8f97c36b7ce9a72b509 SHA-1: 98715f2c3ed047564239d5e401b8e56bbf93b76a SHA-256: a93feab699c279e23b44f3fad4cbdc736667a27ae573ea29dd40691f4a8fd4ac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URIs point towards an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://ketchas.ru/uplcv?utm_term=android+studio+emulator+closes+immediately PDF link annotation
    • https://yukkumpulgroup2.com/contents/files/26447997764.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/90472998392.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/19411299003.pdfIn PDF document text
    • http://frchem.cn/upload/files/97573711487.pdfIn PDF document text
    • https://johanbjerke.se/userfiles/file/dekunukanaretafevefi.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/diwasixuzif.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/leraxenokegopeweza.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/doxejinazuw.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/20079986970.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/dewonubazurifafevopexe.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/25637579966.pdfIn PDF document text
    • http://apmnir.ro/fckfiles/file/526347416.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/podozuwaxomizux.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/1974096809.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/vetinigejepozutejikile.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/90887400607.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/fugojuwivafutebezerojeleg.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/wewogiz.pdfIn PDF document text
    • https://nevisnews.com/userfiles/domovi.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/vidadupi.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/84346561656.pdfIn PDF document text
    • http://redactron.com/userfiles/file/81087635845.pdfIn PDF document text
    • https://clinicscrm.com/img/files/banobex.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/welutuledebopu.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/87221243534.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/002be80af35d1a37142d5521c24d0a1f/87080253772.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_off0000c989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC989 20336 bytes
SHA-256: cc10adcdca376c97834b88e25947a53ffbe3be524452dbd091a640c2ad1487b5
font_01_sfnt_off0000ff4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11766 10724 bytes
SHA-256: 842509747ffd89f41c2bb88c432d2720998ad95a55ba198d7071438b27b92ad1

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