Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bfb3b1f27e9b05a…

MALICIOUS

PDF

72.9 KB Created: 2021-02-15 17:15:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d86592f48c02fe5c4cd870408a814ff8 SHA-1: f5eb8f611d0bccad10e32de48c3eeabaa51eb0e3 SHA-256: 6bfb3b1f27e9b05aa0d40c2a6df8f24590a64d5a4347171935067cb02b74bea8
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a link farm, directing users to a suspicious URL (jottigo.ru) disguised as a search result. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the PDF structure and external links suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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.
  • 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://jottigo.ru/strik?utm_term=how+many+pages+in+the+hunger+games PDF link annotation
    • http://naturapple.space/71700891614abb8f.pdfIn PDF document text
    • http://torchland.xyz/68208514128wcnri.pdfIn PDF document text
    • http://xugerovogubex.22web.org/juditagukuvarolisivu.pdfIn PDF document text
    • http://discount50.pro/como_obtener_diamantes_gratis_en_my_cafebjjqt.pdfIn PDF document text
    • https://riligasiguvenu.weebly.com/uploads/1/3/5/3/135392009/ed61f45fbc47.pdfIn PDF document text
    • http://all-system7.work/math_bafflers_grades_6_8_answers5iodl.pdfIn PDF document text
    • https://kamukijupekud.weebly.com/uploads/1/3/3/9/133997827/fidugutokumaton_gawuzevuraw_xibifiwawo.pdfIn PDF document text
    • http://weinmvc.net/xakimawusoxavunazabezecv4b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/conditional_formatting_google_sheets_entire_row.pdfIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/caldera_peisa_diva_duo_f_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/fovokeribesabes.pdfIn PDF document text
    • https://s3.amazonaws.com/kabisebax/design_brief_template_ks2.pdfIn PDF document text
    • https://s3.amazonaws.com/mipizaju/driver_bluetooth_dell_latitude_e6420.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/iifa_awards_2019_link.pdfIn PDF document text
    • https://s3.amazonaws.com/tigovatolis/blizzard_so_slow.pdfIn PDF document text
    • http://vipezirovopegem.epizy.com/lenorasilos.pdfIn PDF document text
    • http://wulemarodexik.rf.gd/creditor_balance_sheet_item.pdfIn PDF document text
    • https://s3.amazonaws.com/gusule/spreadsheet_javascript_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wegemebufojafak/bayko_marathi_movie.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_off0000df44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF44 5356 bytes
SHA-256: 1e4d2d69cf124a5d891fc50f6a6e075b821bfc75e5f3969c8b9ea8062a287f98
font_01_sfnt_off0000f169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF169 10796 bytes
SHA-256: 9a2e0adcd7e980914fef99dd47f680f703381c1eeb9162b18d4798163178cc73

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