Malicious PDF — malware analysis report

Static analysis result for SHA-256 d717ac3166c5e728…

MALICIOUS

PDF

73.2 KB Created: 2021-09-12 03:14:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b28a1819c58d4dda78918f8ee8628064 SHA-1: 9d3c58cd34390c7707cb66c46612630f0854fa90 SHA-256: d717ac3166c5e728181c22466850f6d2d15659f7a4b63313b1b04d44f56ba6b0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to numerous external domains. While no scripts were directly extracted, the presence of embedded URLs and the link farm nature of the document strongly suggest an intent to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://hoangphatdanang.xetnghiemadndanang.com/uploads/image/files/geludijevixoxifavava.pdf In PDF document text
    • http://wizclub.net/upload/userfiles/file/75538081083.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/zigajubu.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/71402813777.pdfIn PDF document text
    • http://comitatoamiantovelodromo.org/userfiles/file/tafilibexeli.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/34745361678.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/54797269771.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/jajukovadiretuta.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/tavesewibesaga.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/xezapapuxabebuzawexobej.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/xiwosexejozon.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/18655350489.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/59098029993.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/38016370322.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/32636549721.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/b5h2sp57kcg2jj68hgrh5msqsd/gozakavipevafufesovuzoxo.pdfIn PDF document text
    • http://epicridesnepal.com/files/kaxoxig.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/86495281027.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/94673274723.pdfIn PDF document text
    • https://citronel.com/userfiles/files/jopenuvenivuvujalugasog.pdfIn PDF document text
    • https://vili-al.com/uploads/wysiwyg/files/20906328952.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=tyson+vs+jones+how+to+watchPDF 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_off0000bb8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB8B 17264 bytes
SHA-256: 1f462f454b56870cc78a3d545a40436cbe94468e4f90abe95c967813177d0e38
font_01_sfnt_off0000e7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE1 10448 bytes
SHA-256: 2a485791114bc1ba3d6841d8af2875b81d1ce5acccbfe9a4a49573cd64b5291e