Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dbc645df0cac67e…

MALICIOUS

PDF

82.1 KB Created: 2021-09-20 01:24:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: abd1acdc6d3b2b9affbf4fa9f4c4d76b SHA-1: 6ce373caa0410965fb08f57a6823c9cc077821e7 SHA-256: 1dbc645df0cac67e4e36141372548b41cf42156baf3f18d5209a888c9aff6c57
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous embedded URLs, many pointing to potentially disposable hosting, suggests a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://strongpointmarketing.net/userfiles/file/kinedapoli.pdf In PDF document text
    • https://funbugs.ie/files/file/9131010687.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a94a6aa363---jilos.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/bolalatexirejupavufaseva.pdfIn PDF document text
    • http://moretonassets.net/userfiles/758250874.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/fuwotitinonugetowegelod.pdfIn PDF document text
    • http://pbpharm.com/upload/files/5824589661.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/75955556717.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210914190133.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/pivikizinenupubotu.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/golekimomukutugazar.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/xuxiputin.pdfIn PDF document text
    • https://5ky13lu3-1251.com/contents/files/woxogas.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/bisejenevawufubezigidimij.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/nagakem.pdfIn PDF document text
    • http://archbot.pl/files/file/59916118651.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/45507852784.pdfIn PDF document text
    • https://vmgeducationtrust.org/home/vmgedu/public_html/public/userfiles/file/gizazunogonozaxuz.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/36638195508.pdfIn PDF document text
    • https://escritacontabilidade.net/fotos/news/file/vobuzepirasizane.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/7f1b38d2cc9c707e1e995a5a8dd31378/72821529930.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/27320989727.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/lipoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=the+cinema+dosti+app+installPDF 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_off0000d7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CA 10644 bytes
SHA-256: 42d6f0a39e253eea24f26f51e8a9231915c9e47778cde455d1ab6aae005b593d
font_01_sfnt_off0000efef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10801 18956 bytes
SHA-256: 5436d4051ac2779a17310a824e9c2c4e3f43d392287974ab836a0548beb5e151

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