Malicious PDF — malware analysis report

Static analysis result for SHA-256 03a44e5f352cecb9…

MALICIOUS

PDF

86.9 KB Created: 2021-09-20 06:59:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f3dbc849b510929b232262974bbc9e1b SHA-1: 84f465efb503fd08522e0bb28dc299812a138350 SHA-256: 03a44e5f352cecb9c05f1ef26b33d365ab9d2e6c6153fb33fc3ee0d7d1426e25
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://coretry.ru/uplcv?utm_term=world+news+apk PDF link annotation
    • http://hidrometa.com/images_upload/files/83191169552.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/lajofutegekajifaf.pdfIn PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/51476548079.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/2066261479.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/mojufegarusozuwakim.pdfIn PDF document text
    • http://tieclangman.com/Images_upload/files/45133233861.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-9-16/20210916072529996296.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/54016165020.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/rotopobewuvenagawo.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161401b6d08e8a---48400931445.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/48145363077.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/guziralepujul.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/66198593694.pdfIn PDF document text
    • http://school15-tyumen.ru/f/50837202525.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/31287915027.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/23786668051.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/9ba543md35aqimmif58tk6qggp/purememazegodatonig.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/66147559701.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/poxigajufebivajalitu.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/jojufiwerep.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/16987246404.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/33592800448.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/xumizafubel.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/46113521846.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/midegakaputavavofevu.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/98921011191.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/18501999677.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/kogorimipo.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_off0000edfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10615 10368 bytes
SHA-256: 134090fe7bdb9d3549e55686eb08b757413216f3714786ccfb644b51466de161
font_02_sfnt_off00011da6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA6 18524 bytes
SHA-256: 3b27c1c7c6081b787cabf3e33735861c2c92eddc59ea207c0721b032185025c3