Malicious PDF — malware analysis report

Static analysis result for SHA-256 e92a67911f0fa15e…

MALICIOUS

PDF

77.7 KB Created: 2021-02-27 06:35:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 1197909537eddd59e8baf55471c969dd SHA-1: 8433b5fdf91cb4240656ecf7f6d0492aa8daea6f SHA-256: e92a67911f0fa15e794d6bb093a03edb31d44adec35be00a9f53c08792cf2237
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with the primary one leading to a link farm designed to redirect users to various PDF documents. The document body, though heavily obfuscated, contains text related to a "sound amplifier" which likely serves as a lure.

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://pelibifir.ru/award?keyword=amplificador+de+sonido+casero+5v PDF link annotation
    • http://vemusopudin.22web.org/pandora_s_tower_wii.pdfIn PDF document text
    • http://reduslim-eu.site/74670462899vnpp8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371807/normal_6033757415c04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451363/normal_60199043331ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465914/normal_600e1ae633187.pdfIn PDF document text
    • http://infonewstravel.com/xulovaxutilunoxouryny.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377924/normal_5fe930dce9617.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424036/normal_6014c921b55fb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490133/normal_60041bf54b255.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368223/normal_600c8efa26448.pdfIn PDF document text
    • http://hytri.com/54870541802h2pp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nibudikugi.epizy.com/8392386241.pdfIn PDF document text
    • http://xojorefalez.rf.gd/zekanejofowewi.pdfIn PDF document text
    • http://fisavisifesu.epizy.com/free_powerpoint_google_slides_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/32268227747.pdfIn PDF document text
    • http://xofududegotu.epizy.com/58192633492.pdfIn PDF document text
    • https://s3.amazonaws.com/davubewu/35560904303.pdfIn PDF document text
    • http://vuropomap.epizy.com/anonymous_wallpaper_app.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/linking_stylesheet_to_html_page.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7A 5472 bytes
SHA-256: 900848ce7599a8d6b4f665712395bf8d6136b0410ef4e5206b19456c1df9c792
font_01_sfnt_off00010211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10211 11592 bytes
SHA-256: 741e1fb592fe18b8abdae7496622eaddbc2d1d99291faab24bb0468704f754f2

Open this report in the interactive analyzer, or submit your own file for analysis.