Malicious PDF — malware analysis report

Static analysis result for SHA-256 15acc3533954435e…

MALICIOUS

PDF

81.3 KB Created: 2021-09-16 05:33:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: e52927921ef68e0c04bd8be5374135e0 SHA-1: ca96765d2b1efbd88ae8f6df47e10af47d6b98c1 SHA-256: 15acc3533954435ef07ff01c59686a1d21bd1a6a0e4df5c59931e5675b77d31c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, with heuristics indicating it functions as a link farm. Numerous external URLs are embedded within the document, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly indicate an intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://concertwristband.com/resimler/files/vagovaboxurolivikunozuwaz.pdf In PDF document text
    • https://topclassgardening.nl/images/file/koxuguvuvalirovep.pdfIn PDF document text
    • http://www.portaldasfreguesias.com/portugal/vianadocastelo/vianadocastelo/geraz_do_lima_sta_maria/ckeditor/ckfinder/file/91785461269.pdfIn PDF document text
    • https://onwater.my/uploads/file/xolodixekinamabasesuwoz.pdfIn PDF document text
    • http://auswallendorf.de/userfiles/file/430069531.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/kuzupuloxapapolirikugop.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/juguraza.pdfIn PDF document text
    • https://ms02bet.com/contents/files/nuwopurizosukotuvemato.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/35188080830.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/jakawivukefekuzisobaje.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/14495059487.pdfIn PDF document text
    • http://orthodoxnews.us/file/58544165859.pdfIn PDF document text
    • http://mannadey.in/FCKeditor/file/fadewaput.pdfIn PDF document text
    • http://hennel.hu/sources/elemek/file/12701456496.pdfIn PDF document text
    • http://ceroki.com/image/files/72190616959.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/widomulomimiv.pdfIn PDF document text
    • http://natalieshuff.com/uploads/file/32354787016.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210904_8C0A5AEB038AD942.pdfIn PDF document text
    • https://ngenadmin2.nextgenphotosolutions-beta.com/app/webroot/files/file/44194284044.pdfIn PDF document text
    • http://sentai.cc/data/file/20210916_100645_353.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/boxawidadotajenuwaja.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021951356303490.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/84769037521.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=long+tail+keywords+arePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DD 10672 bytes
SHA-256: a667512be54c39a1814f58a94e222f770078753f40a11da3cf403af058055b93
font_01_sfnt_off0000f155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF155 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10967 18216 bytes
SHA-256: 28d6404a6786cb451550504173e1c138c380fd114aab01010ea4e1ffe26aed8d

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