Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b87c41427b6373d…

MALICIOUS

PDF

69.8 KB Created: 2021-09-25 12:46:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: aa1f298ebe79bc69de89c84c0fd75278 SHA-1: 921dfcae096e92b241fb4b7d9f2a4ea0aeea2bad SHA-256: 9b87c41427b6373d880547c9d8c6e3f6ba75d39a319e3c605a7220ef0254b660
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous embedded URLs, including one that appears to be a redirector with a 'hungry shark world hack version' UTM term, suggesting a lure for potentially malicious content. The PDF structure and embedded links indicate an attempt to lead the user to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=hungry+shark+world+hack+version PDF link annotation
    • http://epilia.com/upload/FCKEditorfile/lanesuwefukifu.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/76607512564.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///jemekoxesazefikepubomon.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/16705832397.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/77386669118.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/xenewebuwapajume.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/35526223367.pdfIn PDF document text
    • https://rcot.org/userfiles/file/43220282906.pdfIn PDF document text
    • http://viajaconsciente.com/imagenes/userfiles/file/57062590465.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/80471978484.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210924043816_1903011239.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/nuvita.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/zovofekerusekewi.pdfIn PDF document text
    • https://glozor.com/userfiles/file/79275570736.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/bawoju.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/bijesetob.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/lisawonise.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/41326034465.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/32557964465.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/36039802130.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/77742543487.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/xuvozenuwuzodejazukadever.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/wunewonebinugotitiredobi.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/fixodezerimi.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_off0000b169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB169 11000 bytes
SHA-256: 6848bb933bdab9007563b92d3205d342c7f9e16d611605ad521defb9fb4696ab
font_01_sfnt_off0000cab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB2 15268 bytes
SHA-256: 1798bd1cd9d1c4beb07487c2a083651291f23cf862cd0991d8127e0654d31c43
font_02_sfnt_off0000f148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF148 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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