Malicious PDF — malware analysis report

Static analysis result for SHA-256 a949cc4da9cdeadf…

MALICIOUS

PDF

79.2 KB Created: 2021-09-08 18:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1affdadfb52903855cc604e4329b756a SHA-1: bf04bdf288eea9443446b0672a7852f196ada5ba SHA-256: a949cc4da9cdeadf50ab7db44f8d54256b03a917530523a3a8ccaf6b76badbfd
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16136ddafbeb58---fotewotesebutebarekajelu.pdf In PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/rewasokurunopu.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/29691148462.pdfIn PDF document text
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/vuziniximimonof.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/30960627961.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/zogululo.pdfIn PDF document text
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/38676247459.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/nutaso.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/fuvarikojunupelagiwipumas.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/51617177360.pdfIn PDF document text
    • https://butchercurnow.com/img/shop/contents/11819367245.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/majilovolewokabar.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/bomerusebexumo.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/xarikinunagogopujefap.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/zubuziwuxerovukisezebu.pdfIn PDF document text
    • http://benly-carson.com/product/files/godulivoj.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/33668385159.pdfIn PDF document text
    • https://kvizek.hu/ckfinder/userfiles/files/81081428385.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/6458453997.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/94561944203.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/gasofelozisagofarizil.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/pafobinaguguzakexajufo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=adding+and+subtracting+integers+worksheets+math+drillsPDF 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_off0000d0f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE909 16872 bytes
SHA-256: a7a4ffe5cbfad512b704d7cdb989f1c288723955cd0736442f3985cb51ae7f94
font_02_sfnt_off000114ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EA 11216 bytes
SHA-256: 2592591eb3fa1e643b3d414bea1779dca023ce41ed0c94f8ea60b7e89fbfd604