Malicious PDF — malware analysis report

Static analysis result for SHA-256 50c944bb4a791028…

MALICIOUS

PDF

84.8 KB Created: 2021-03-29 20:19:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 204de4ea481e9dd7b1402c3c73ec2685 SHA-1: 7420962e7ee5cf034b3fee9bbdc92f4618bd4eeb SHA-256: 50c944bb4a79102856fe3d7ed49a4bca4ebdfa0a42c320e8d7c858d4c20bcc29
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, with several pointing to suspicious domains like vilenefex.ru and tlgfree.xyz, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/award?keyword=proof+of+sum+of+arithmetic+series+pdf PDF link annotation
    • http://tlgfree.xyz/sosowewom9lqx8.pdfIn PDF document text
    • http://bitjoms.xyz/nissan_qashqai_n_connecta_2019_manuall5qzu.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/vuxibola.pdfIn PDF document text
    • http://indir-kazan.com/kavasinovurinuvinzlz8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409818/normal_602e4ad8377e7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446158/normal_6004e0071d1f4.pdfIn PDF document text
    • https://s3.amazonaws.com/bogijexu/15696774921.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446395/normal_6035e403ac38b.pdfIn PDF document text
    • http://modutomipofa.iblogger.org/radebelegataxunitatasemup.pdfIn PDF document text
    • http://health-top.ru/41890985270z9okv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9b1f008-2500-432e-a285-6e0c697d2d8b/ez_go_golf_cart_stopped_running.pdfIn PDF document text
    • http://kujodobiwug.rf.gd/27633130903.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/131ac109-ef16-4528-9271-21489a271c1f/38716816647.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26cc25e7-bbef-47ae-aa53-e6fa8fccf0d5/pojawunupo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/940fdf22-ab5b-4fc8-ab8e-06f469d0d807/74775726963.pdfIn PDF document text
    • http://wozojatoxako.epizy.com/dobaxinatiferijibir.pdfIn PDF document text
    • http://filipebed.rf.gd/vakimex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3476cf3e-e9ea-4c7d-8ce6-f8d648cdf79a/how_to_read_violin_notes_for_beginners.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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 5

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF417 5364 bytes
SHA-256: a261e10a3568ef4f953bf66fa196e95152dde46e455b0760d889ec9c1f7cf1ea
font_01_sfnt_off0001062b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062B 12524 bytes
SHA-256: 614c3829942420a14a7a0c5969d1192dffd3730544cc73e14a32e97d2b52a338
font_02_sfnt_off00013070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13070 16112 bytes
SHA-256: 0e9660d462f3853f214b8c809e551daf1ea655463c3a22f249c648a7021f432c

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