Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dc41fb2592ac665…

MALICIOUS

PDF

87.6 KB Created: 2021-04-14 23:45:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a5d08a4b673d127a04bd35272ecbae18 SHA-1: 7ec3f0f8a2412a441af81b460091b5ee2df1e126 SHA-256: 2dc41fb2592ac665846df6e8ad953d41a8cd9a24fcfa23de9696b8f1747b7e7e
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. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a lure to external malicious content, likely for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://xajibur.ru/strik?utm_term=sat+exam+syllabus+2019+pdf PDF link annotation
    • https://cdn.sqhk.co/pozedezupase/jfAGaje/96195212428.pdfIn PDF document text
    • https://cdn.sqhk.co/xorakulenido/gJ8z5ja/mitaxoxomax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494874/normal_5fda39baa9fd7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476569/normal_5fe519881a2f8.pdfIn PDF document text
    • https://cdn.sqhk.co/baxafapunubi/hcWyiao/ganulokenak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414152/normal_602480a8ec157.pdfIn PDF document text
    • https://cdn.sqhk.co/rutunidosaw/Giigiif/pocket_sniper_mod_apk_download.pdfIn PDF document text
    • http://bejisosubonito.sportsontheweb.net/a_view_from_the_bridge_themes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385010/normal_5feb940ecb19f.pdfIn PDF document text
    • http://rajajime.mypressonline.com/30235333370.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466364/normal_6033c7e1e3157.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502906/normal_5fef6ac93897a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483602/normal_5fd2c5c74a391.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kupikobu.epizy.com/gupivepe.pdfIn PDF document text
    • http://dexifenila.rf.gd/buddhist_calendar_2020.pdfIn PDF document text
    • http://fojakosi.atwebpages.com/why_wont_my_samsung_smart_tv_stay_connected_to_the_internet.pdfIn PDF document text
    • http://sonapap.rf.gd/niconico_video_apk_english.pdfIn PDF document text
    • http://bobupugarini.epizy.com/principles_of_applied_research_methods.pdfIn PDF document text
    • http://gitodake.myartsonline.com/aprendizaje_significativo_constructivismo.pdfIn PDF document text
    • http://palakojum.rf.gd/8185506969.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aba0a5fa-4a1a-4c33-a5bc-f7a4a5b2c6ce/comfort_zone_digital_quartz_infrared_heater_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51d44b24-5db7-4ae3-908d-af4c85bf3339/love_monster_valentine_craft.pdfIn PDF document text
    • http://wudemexa.myartsonline.com/commercial_electric_multimeter_ms8301a_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1650e50-977a-42ed-be6d-39698d556154/walmart_pharmacy_near_me_open_24_hours.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4b1547c-c7dc-4a96-b8cf-3eee1be57942/7122951872.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_off0001178b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1178B 5988 bytes
SHA-256: e509307135e2b79402e7c091069fb510e3fb2aa2b7c809808e055638d346f9d2
font_01_sfnt_off00012be6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE6 10972 bytes
SHA-256: 98326f59e3f249a2224ac5a085449699755d21acab45809dd6e8672c223f0432