Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b05d807d5c40c38…

MALICIOUS

PDF

79.8 KB Created: 2021-02-15 03:15:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: d3d8a78f39c3f35d460408e1dc0ec65a SHA-1: 79f5a0cbdb086b94ad3892cd588f59c05fcb4971 SHA-256: 5b05d807d5c40c38d0c916f8f46ef55e5b08648eea5fff7a6e7fa5115b2eff83
134 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous external URIs, many pointing to disposable domains, suggesting a link farm designed to host or redirect to malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://leonvi.ru/123?utm_term=big+stone+gap+virginia PDF link annotation
    • http://ruzazeruduzelu.22web.org/fishing_report_chesapeake_bay_2019.pdfIn PDF document text
    • https://kujazekomoduni.weebly.com/uploads/1/3/5/3/135315250/javudakujijigipu.pdfIn PDF document text
    • http://rifubabesepa.iblogger.org/fesowujivuwudikutosupamav.pdfIn PDF document text
    • http://jejunobu.iblogger.org/44672089100.pdfIn PDF document text
    • http://xuwajofona.iblogger.org/93475560802.pdfIn PDF document text
    • http://sawalaxal.66ghz.com/steam_workshop_er_csgo.pdfIn PDF document text
    • https://gojatoxemoniro.weebly.com/uploads/1/3/4/8/134894745/e1c5b3dbbf08d.pdfIn PDF document text
    • http://powezikunuzumi.iblogger.org/8522030071.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fegumipidibig.rf.gd/zeguwefibuxe.pdfIn PDF document text
    • http://votitagupen.epizy.com/89851155404.pdfIn PDF document text
    • http://fopaguduvogo.rf.gd/bhangra_bistar_video_song.pdfIn PDF document text
    • http://jilutuve.rf.gd/36464978943.pdfIn PDF document text
    • http://nanixalo.rf.gd/100_names_of_allah_in_arabic.pdfIn PDF document text
    • http://zokivobadid.rf.gd/annadurai_movie_songs_kuttyweb.pdfIn PDF document text
    • http://zuxeretufem.rf.gd/hillsborough_disaster_news_report.pdfIn PDF document text
    • http://xufizup.rf.gd/validity_and_reliability_in_research.pdfIn PDF document text
    • http://bokazoniwojuwod.rf.gd/free_sample_high_school_resume_template.pdfIn PDF document text
    • http://fodakobenolam.rf.gd/realcalc_scientific_calculator_plus_apk.pdfIn PDF document text
    • http://fapibudu.epizy.com/75400800927.pdfIn PDF document text
    • http://mapexas.epizy.com/54580013526.pdfIn PDF document text
    • http://sawutekoxa.epizy.com/whatsapp_for_nokia_e63_latest_version.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB97 4852 bytes
SHA-256: 2f09c8c25739918bee446a75979fc5d0f255875600b346ed09fe3b52ad070687
font_01_sfnt_off0000fc23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC23 11636 bytes
SHA-256: 05429d76580e0de6d81ccfef2d14f6d46a3f9ebc0bb6553ab0b542d8970fe0cb
font_02_sfnt_off00012380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12380 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34