Malicious PDF — malware analysis report

Static analysis result for SHA-256 2572b3964cf81147…

MALICIOUS

PDF

73.3 KB Created: 2021-09-15 15:36:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eb04e0081517e34b71e80c51b595873b SHA-1: 36f7aff3c37f133f8a5489f693ea671838cd84fb SHA-256: 2572b3964cf81147ddcacd830adab5e9354ce8bd4201e5b866477315403bba13
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. The PDF contains numerous external URIs, many pointing to disposable hosting, suggesting it functions as a link farm. The presence of embedded URLs and the overall structure strongly suggest it's designed to redirect users to potentially malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://medvor.ru/uplcv?utm_term=john+wick+chapter+3+tamil PDF link annotation
    • http://bumsnab.ru/uploads/files/nepikoxefukisazakarat.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613595075f568---nimalanuxon.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/50808849036.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/76070180374.pdfIn PDF document text
    • http://www.atsamuihaus.com/image/upload/File/19188743009.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/92515683432.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/lafibexoxa.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/lulixujigutepinuran.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/mimuxevadize.pdfIn PDF document text
    • http://stfurnimart.com/file_media/file_image/file/54780905963.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/vasupezizakapev.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/suvipaxedovis.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/16388490924.pdfIn PDF document text
    • http://turchifiltri.com/userfiles/files/68621770127.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/10637052509.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/o60857hske3au15tmqdte3sac0/77642441007.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/nemobaguxanezot.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/20036286684.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/pediforuvetexibumuvekapij.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/47029730445.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/wunepafoxanoganat.pdfIn PDF document text
    • http://santehnika34.ru/images/file/lakide.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/13569369702.pdfIn PDF document text
    • http://seamacros.com/upload/file/korawalakukexobez.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_off0000bab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAB9 10812 bytes
SHA-256: d50ec7b2715cf104f9660f15bffa87aa7b648d2135a28ecd68e6beb12a65ad17
font_01_sfnt_off0000d399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD399 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAB 17164 bytes
SHA-256: 5bd0e2c4b5a65fa6348f42276f3c22f18fafeea799bf7cb1e02723470a5b686e