Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5513278a0c19004…

MALICIOUS

PDF

69.2 KB Created: 2021-09-30 10:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9079a65cfd1282d4f0f8318de2516312 SHA-1: 237e6d6e300ebd81236e1c70fabbdad5f5c88ab8 SHA-256: d5513278a0c1900402bd4a69dfb48da311a692cf6f75b9819625e6497122ec5f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ibshospitals.com/userfiles/file/78003441100.pdf In PDF document text
    • https://ht-cooling-j3t.com/contents/files/lusimugirap.pdfIn PDF document text
    • https://jager-ig.tw/up_photo/file/19788546679.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/duweselujos.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/41781326728.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/82300458207.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/tagibokotukidizi.pdfIn PDF document text
    • http://schubert-hh.de/image/file/xinutenisu.pdfIn PDF document text
    • http://allasclub.com/campannas/file/fujuserasukidisexaxixul.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161321ccdd8e6d---watavux.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/1dd2c0975c1b5ef016804ac985716ccb/19880789546.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/49230398361.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/40766781011.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/temuxusobuxisezafotulo.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/09/19/89585323240.pdfIn PDF document text
    • https://dreptultau.hotnews.md/upload/userfiles/files/50647903619.pdfIn PDF document text
    • https://thuhuonglacquer.com/uploads/news_file/gefilufaxixazulisipeper.pdfIn PDF document text
    • https://rwd.webseo.tw/upload/files/jozulofafobexafez.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/23381470152.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/zojonijirobonenavuger.pdfIn PDF document text
    • http://ciskmv.com/css/file/19193753890.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/vujofumijoxitipekowodowex.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/wunuxumujeduxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=schaum%27s+general+topology+pdfPDF 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_off0000ae24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE24 15316 bytes
SHA-256: 3dd9e8292cba7e5795c1ebef573dbb31eb1b548c429e2507f9ab0fd3a853cc94
font_01_sfnt_off0000d4de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DE 11296 bytes
SHA-256: bf39eff7e8144964b04bc038c76b31f1558d83fa241cad33674a41eb35dc89ab
font_02_sfnt_off0000ef21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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