Malicious PDF — malware analysis report

Static analysis result for SHA-256 5acecadf6f23be5c…

MALICIOUS

PDF

77.4 KB Created: 2021-05-08 06:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d0817571febcc610e779700494baf94e SHA-1: 502929c77f90ad5ebd39b8872431a50cbf9b0bf5 SHA-256: 5acecadf6f23be5c3b2707d60da306ede66467cc58f8c0f3c921548dd576e1fc
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least one, 'https://dafemum.ru/strik?utm_term=can+you+sell+your+leave+days+army', being a primary indicator of a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests a deliberate effort to obscure malicious links within a large number of disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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://dafemum.ru/strik?utm_term=can+you+sell+your+leave+days+army PDF link annotation
    • http://wanulutipumik.iblogger.org/best_acknowledgement_for_industrial_training_report.pdfIn PDF document text
    • https://cdn.sqhk.co/zolewiko/jgKZAHK/how_far_can_you_hear_a_plane.pdfIn PDF document text
    • https://cdn.sqhk.co/tatogevi/ugjied8/33766147162.pdfIn PDF document text
    • http://muzhskoizhurnal.ru/fundamentals_of_thermodynamics_7th_edition_solution_manual_moranz02v4.pdfIn PDF document text
    • http://goodsun.space/matlab_for_loop_over_array_elementsu1b65.pdfIn PDF document text
    • https://cdn.sqhk.co/joxusozomilo/Sijia3o/mcat_scores_for_do_schools.pdfIn PDF document text
    • http://bikelumonekodex.mygamesonline.org/techniques_d_analyse_biologiques.pdfIn PDF document text
    • http://ukranews.icu/space_engineers_update_log3t2yy.pdfIn PDF document text
    • http://rakapugijumub.sportsontheweb.net/hng_dn_chuyn_file_hnh_nh_sang.pdfIn PDF document text
    • http://defi-bet.world/how_to_watch_after_we_collidedmwhbh.pdfIn PDF document text
    • http://women-ita.space/78630225164041zw.pdfIn PDF document text
    • http://getsol.xyz/top_books_to_read_to_become_successfulwe79u.pdfIn PDF document text
    • http://premiumpornclips.com/sniper_training_school4wb79.pdfIn PDF document text
    • https://cdn.sqhk.co/wikaraxixi/Tifgeid/global_warming_facts_and_statistics.pdfIn PDF document text
    • https://cdn.sqhk.co/mivezifov/fZBUvUy/super_bubble_pop_pc_download.pdfIn PDF document text
    • http://helplnstagram-confirm.com/45833968348ehynh.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • https://cdn.sqhk.co/dagosasojo/jfBjehc/puwapiwafuv.pdfIn PDF document text
    • https://cdn.sqhk.co/malevevipali/dhjhcej/vexotanid.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sagoralezerelo.onlinewebshop.net/international_marketing_definition.pdfIn PDF document text
    • http://kugunimekuxaf.epizy.com/minonubojetalobo.pdfIn PDF document text
    • http://vogapodidojuguf.myartsonline.com/fulesejapamonep.pdfIn PDF document text
    • http://mivuturirem.rf.gd/12262955551.pdfIn PDF document text
    • http://xewebumobodoris.rf.gd/easy_vegetable_dishes_for_dinner.pdfIn PDF document text
    • http://wizigipixe.atwebpages.com/93286363753.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_off0000f2a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A5 5036 bytes
SHA-256: fc43245f4da5b68330609e6bb7f419aa3b01e286119f154dc5725934bbee53be
font_01_sfnt_off000103b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B7 10672 bytes
SHA-256: 3082c7e35676ae79dc78b9cdbeeb2f6656d748eeaad2164b02c55b8b82cd5221