Malicious PDF — malware analysis report

Static analysis result for SHA-256 902a65e008154b14…

MALICIOUS

PDF

98.7 KB Created: 2021-01-25 11:40:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 773fda2dba6caf25c5f406c7243bbf55 SHA-1: 0c93010fc566dba224b0ff88c6f2ed44f3337366 SHA-256: 902a65e008154b148101b37816d1cde1024a6e84bcbc754678f59acbceff88e0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one pointing to a PDF hosted on a disposable domain, suggesting it acts as a downloader for a second-stage payload. The presence of a 'Download' button heuristic further supports this phishing-like lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://seumenha.ru/123?utm_term=walmart+mountain+home+ar+store+number PDF link annotation
    • http://hydraruzxpnew4af.exchange/reginuxerilze69u.pdfIn PDF document text
    • http://edarudost.online/volum6lalp.pdfIn PDF document text
    • https://bivuremopukojez.weebly.com/uploads/1/3/0/7/130740249/ligotu_sasinetodafa_nugideteko.pdfIn PDF document text
    • http://scoretdho.best/install_mod_menu_gta_5_xbox_3602nn09.pdfIn PDF document text
    • https://gidafefutor.weebly.com/uploads/1/3/4/0/134040883/6083298.pdfIn PDF document text
    • https://wevinavuligi.weebly.com/uploads/1/3/4/5/134505150/jodek_fololanividute.pdfIn PDF document text
    • http://studyweb.site/no_limits_race_to_sunsetzshuv.pdfIn PDF document text
    • http://disclosures.space/server_2016_routing_and_remote_accessrh2jp.pdfIn PDF document text
    • http://pshcomonhere.xyz/free_fidget_spinner_spinnerr1dvb.pdfIn PDF document text
    • https://benipotuwazel.weebly.com/uploads/1/3/4/4/134445242/radase.pdfIn PDF document text
    • http://copyright-infringement.business/hip_hop_and_rap_music_historyxjvt5.pdfIn PDF document text
    • https://lufukosiresefo.weebly.com/uploads/1/3/4/7/134707539/1481372.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zenejifawulo.epizy.com/24_hour_weekly_schedule_template.pdfIn PDF document text
    • http://vabizofolimise.epizy.com/earth_s_spheres_webquest_task_sheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/gewisetug/wawulifulolajokolopabu.pdfIn PDF document text
    • http://jonegukum.epizy.com/77306030662.pdfIn PDF document text
    • http://josuguremim.epizy.com/radio_button_like_checkbox_android.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_off000144fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144FE 5076 bytes
SHA-256: 8b705e519591788a325388b990af25c023aa9449a89ac889ee7a88d3e9b04cce
font_01_sfnt_off0001561e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1561E 11500 bytes
SHA-256: c515e0caf1957d8af00295171d3c2bff81913bcfe216cf405c8e8fb7eb4a7052

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