Malicious PDF — malware analysis report

Static analysis result for SHA-256 72c246f82f8e087c…

MALICIOUS

PDF

75.2 KB Created: 2021-02-10 18:46:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e557d0883fcee574f6c56c978386177d SHA-1: 59bdc97bfe3bbaa50b58e610e1b0c944eec1ccf9 SHA-256: 72c246f82f8e087cb755e340a3cfd3918f262f5dfc059df533f83c104a7bb211
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of external URIs and the link farm heuristic point towards a spearphishing attachment vector, likely designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://jottigo.ru/123?utm_term=catholic+faith+defenders+manual+pdf PDF link annotation
    • http://slimerecipe.org/15425376089u1oc4.pdfIn PDF document text
    • http://static-start.top/79705468840myfqg.pdfIn PDF document text
    • http://lnstagramverifiedbadgeservice.com/ruritapurimozalujoxinapony3gk.pdfIn PDF document text
    • https://cdn.sqhk.co/firokizita/f6AEHih/ikea_hours_today_toronto.pdfIn PDF document text
    • https://cdn.sqhk.co/sitosuduf/eTFvsK2/sogajikawug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375708/normal_601581fc1822e.pdfIn PDF document text
    • https://cdn.sqhk.co/tusifefovozu/biz5Q8a/xiruzokotojuzubogobun.pdfIn PDF document text
    • https://cdn.sqhk.co/sobexofap/iiifNhe/xumilajokoxopo.pdfIn PDF document text
    • http://life50it.pro/grim_grinning_ghosts_sheet_music_pianomd5fu.pdfIn PDF document text
    • http://tronreserve.online/70392439866oobw.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://xulodolab.epizy.com/free_font_montserrat.pdfIn PDF document text
    • http://pamidomepimebop.rf.gd/android_tv_browser_with_flash.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_off0000dbbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBB 5300 bytes
SHA-256: 86a45926edc26d7718e5344efca65ef4874e0105158ec790527083035a7bacc7
font_01_sfnt_off0000ed90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED90 10836 bytes
SHA-256: 2b187074c01438eac920eb095b6c157ee13d17e5ec6852a3e50f9cf94aa06da7
font_02_sfnt_off00011204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11204 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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