Malicious PDF — malware analysis report

Static analysis result for SHA-256 53c35fb96022416b…

MALICIOUS

PDF

68.7 KB Created: 2021-03-25 20:16:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 413877f7d24de02bb3eb93bd184bddd0 SHA-1: d3acd0bc57598476e5e7485895ffa8ad02cdbb8c SHA-256: 53c35fb96022416bc1534b193e43793c26ebd2176e2f34daf3f92aef79ff2c67
156 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 of which are generated to appear as SEO-friendly content, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as Pdf.Phishing.Trojan. The embedded URLs, such as 'https://botokaw.ru/strik?utm_term=samsung+sm-t230nu+charging+port+replacement', are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/strik?utm_term=samsung+sm-t230nu+charging+port+replacement
    • https://cdn.sqhk.co/kigaratak/ageiagj/home_design_3d_freemium_for_pc.pdf
    • https://cdn.sqhk.co/nuduniguwufo/2ktnhcv/63631603383.pdf
    • https://cdn.sqhk.co/ligumorik/uidjigd/personal_security_in_legal_definition.pdf
    • https://cdn.sqhk.co/fatepotax/giggh4W/border_crossing_into_canada.pdf
    • https://cdn.sqhk.co/wenegifuteg/ob0sylO/tutorial_pivot_table_excel_2010.pdf
    • https://warodimaziwini.weebly.com/uploads/1/3/4/6/134611971/8193011.pdf
    • https://cdn.sqhk.co/befozaxulot/ghidZmD/33365695620.pdf
    • https://xotototovizeta.weebly.com/uploads/1/3/2/3/132303406/ed5f5773909c.pdf
    • https://cdn.sqhk.co/jipogidara/GYJEhju/8159916526.pdf
    • https://cdn.sqhk.co/wofazexej/dieFEab/wurutegegizisipunewitobog.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://7be8961d-effb-4c78-a255-78c3c9f0be09.filesusr.com/ugd/3dd68e_905e8dc7e8e448abb10ceccbce2e4cbd.pdf?index=true
    • https://be1d055c-b83b-422e-9e68-1bf13cef350c.filesusr.com/ugd/5b1e3c_8874924841ae40e2a9b77213fce5e62c.pdf?index=true
    • https://s3.amazonaws.com/pibabopuduj/algebra_2_transformations.pdf
    • https://s3.amazonaws.com/vuxirefare/behavioral_approach_to_information_retrieval_system_design.pdf
    • https://s3.amazonaws.com/voxulija/20851655880.pdf
    • https://s3.amazonaws.com/nerugiraxura/comparing_duration_of_time_worksheets.pdf
    • https://391e4f24-9fc9-4707-ac06-338edcd9f959.filesusr.com/ugd/110ef3_fde5f93d09534ed8b8a3bda159f432b4.pdf?index=true
    • 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_off0000c9dc.bin
88e641af3230eefb11a979ac64cc017d691e92b6c136b6e1ae43d53ab48931e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9DC 5920 bytes
font_01_sfnt_off0000ddde.bin
0ea0833f2dea138725b6434ea3dd9980476aab15d81172728b4a343059b1b7f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDE 11348 bytes

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