Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc769052e1a5a798…

MALICIOUS

PDF

73.3 KB Created: 2021-09-11 07:15:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3e4abf027729110fe0ebf7f88b652e60 SHA-1: 4b2ce7ff488385f7eaa637a48442c27ad7b75ec8 SHA-256: fc769052e1a5a7988d1a4520be3d698b8a0a7cf461e745730432b8ed0eeea053
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with heuristics indicating it functions as a link farm on disposable hosting. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and URL distribution suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://hyundainhapkhau.vn/upload/files/74645129559.pdf In PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363b6a97b58---87626060832.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/63186514346.pdfIn PDF document text
    • https://ilonew.tasksplan.com/userfiles/files/fazewidogomivapegew.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/gedorirafugiwivefef.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/70514162293.pdfIn PDF document text
    • http://espokebar.com/uploads/files/lomalu.pdfIn PDF document text
    • http://woykoff.hu/upload/file/vupopawus.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/52270075764.pdfIn PDF document text
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/16519842528.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/38976170784.pdfIn PDF document text
    • http://byecook.com/ckupload/files/nikejaduzuvadetim.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/89004504645.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/kuzutibukikobeg.pdfIn PDF document text
    • http://saaretravel.ee/images/file/47674590158.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/8ae9185689f8060907a363c3a13f1deb/84054088207.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/veputusanibeg.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/takopabab.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/56435525944.pdfIn PDF document text
    • https://tamphuctriland.vn/upload/files/bimutajelotivas.pdfIn PDF document text
    • https://taumed.kz/upload/2021/09files/210907132442179516g4myn.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/nanas.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/larininigupax.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/93368916316.pdfIn PDF document text
    • https://pierreseche.fr/userfiles/file/zebokoburobaxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=apk+among+us+2PDF 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_off0000be62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE62 10420 bytes
SHA-256: 619636b57847da4aabba84cd8f0805a8ad002ae46c57874eb8952007ed1a8e4a
font_01_sfnt_off0000d61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2C 16264 bytes
SHA-256: da42a5da6e50601e289ee230520d050e9f3c9be4956b63a69d9305b7aa0ba720