Malicious PDF — malware analysis report

Static analysis result for SHA-256 24cefec9b79e9e57…

MALICIOUS

PDF

71.5 KB Created: 2020-11-18 03:52:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dec591a7fc612a65733e49364f929c32 SHA-1: 7676e67796bfb5aa7689a3d005810723c83641ac SHA-256: 24cefec9b79e9e576333ee0447aa0cd29e87c37827105745be23d83be2ded2c4
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, and one directly to 'trafffi.ru' with a search term related to 'Donald Trump Roblox'. This indicates a link farm designed to redirect users to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://trafffi.ru/strik?utm_term=donald+trump+roblox
    • https://pajopujo.weebly.com/uploads/1/3/4/3/134305169/kewifalezom_varenaw_mitejojikipaziv.pdf
    • https://pulatufulufu.weebly.com/uploads/1/3/4/6/134610330/wenarag-taxikamerob-duxiwe.pdf
    • https://mobajexiv.weebly.com/uploads/1/3/4/4/134455683/vakedared.pdf
    • https://xuwudavalibabiv.weebly.com/uploads/1/3/4/3/134321130/a99dc.pdf
    • https://zoxuzula.weebly.com/uploads/1/3/4/4/134489613/somonalajefedatiba.pdf
    • https://kuvejepi.weebly.com/uploads/1/3/4/4/134452054/zunesanuxagax_relejo_xotixif.pdf
    • https://cdn-cms.f-static.net/uploads/4446915/normal_5fae0ca6952da.pdf
    • https://laguvibokabab.weebly.com/uploads/1/3/4/3/134383318/b6aaa5.pdf
    • https://rakikamizop.weebly.com/uploads/1/3/1/4/131437254/taxozi-bebufizosameda-dumujuzow-todinupagozodi.pdf
    • https://xemawegomefere.weebly.com/uploads/1/3/4/7/134736207/3351b75f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/purixifusipelid/westinghouse_digital_photo_frame_dpf_1021.pdf
    • https://s3.amazonaws.com/baposivarabuj/laribezaje.pdf
    • https://s3.amazonaws.com/mekonulegipero/72109492427.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db30.bin
a1fc2abea1a35ed27423230b9e2214832329a3c0ec16424f695d610712869c6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB30 5136 bytes
font_01_sfnt_off0000ec8c.bin
b0db35eeb4a3afe4e75467a1a9aeaa9e11dc892afa67312b34ec921f79735236		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8C 10688 bytes

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