Malicious PDF — malware analysis report

Static analysis result for SHA-256 591b6188bd7efe93…

MALICIOUS

PDF

84.0 KB Created: 2021-04-08 13:44:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 3a52c330822f6afb64b4ceacdb6debaa SHA-1: 5f124c42950184851a0862ef74e46da04bfc5a27 SHA-256: 591b6188bd7efe930b9a0f6b6c5f1a5a199e4e9e52c660b55754e27412c92f72
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, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://zajinet.ru/strik?utm_term=manchas+vermelhas+na+pele+que+n%25C3%25A3o+co%25C3%25A7am+e+descamam PDF link annotation
    • http://rowaxamapitowej.getenjoyment.net/94738995909.pdfIn PDF document text
    • http://fidafevemikiwe.mywebcommunity.org/haier_hprb08xcm-t_manual.pdfIn PDF document text
    • http://tedosuz.iblogger.org/eclipse_python_interpreter.pdfIn PDF document text
    • http://budivev.scienceontheweb.net/japunines.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459176/normal_6003938f470e1.pdfIn PDF document text
    • http://xexapitanegis.getenjoyment.net/lupanubevogosavumidud.pdfIn PDF document text
    • http://tegokujili.iblogger.org/where_to_drop_off_old_clothes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391326/normal_6037244a929be.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479904/normal_60029951db700.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425728/normal_602dfa6694278.pdfIn PDF document text
    • http://ditoxepazemu.22web.org/segagasenufetiga.pdfIn PDF document text
    • http://tefosewun.22web.org/domestic_disturbance_report.pdfIn PDF document text
    • http://peregukejipesa.iblogger.org/56250178856.pdfIn PDF document text
    • http://kiladuwujufuzav.22web.org/vedemijemux.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jufomotapi.epizy.com/us_intervention_in_latin_america.pdfIn PDF document text
    • http://vejawogi.rf.gd/what_survival_foods_last_longest.pdfIn PDF document text
    • https://76df98a8-3e94-4eee-a6f5-23e1de06049b.filesusr.com/ugd/54c74c_6b5cfc2102f64b6a9415ff747fcf2b09.pdf?index=trueIn PDF document text
    • http://tajarajizuwoso.rf.gd/terminal_and_coterminal_angles_worksheet.pdfIn PDF document text
    • http://merovuditipin.onlinewebshop.net/bottle_washer_in_beverage_industry.pdfIn PDF document text
    • http://pupudewasoxo.epizy.com/asma_gina_2020_espaol.pdfIn PDF document text
    • https://a765b249-d442-4b07-8ea9-8318d996b894.filesusr.com/ugd/902d29_0916d220970a430c958ad3fb7695ef74.pdf?index=trueIn PDF document text
    • http://poxabeb.rf.gd/certificate_design.pdfIn PDF document text
    • https://d0fd53c2-66a5-49f7-a942-a4bfc50892a3.filesusr.com/ugd/11baf9_b69275f2963248e799c11713ae941192.pdf?index=trueIn PDF document text
    • http://vufuxit.epizy.com/guide_caitlyn_8._24.pdfIn PDF document text
    • https://8271b8e8-1520-4b18-8785-2fafc8cd33e6.filesusr.com/ugd/efc97f_c29ddff5575949a2b8ca1b83a3f6b608.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1D 6004 bytes
SHA-256: 38f5c25d55b7f6f388c720feaee6635a1184cf2affdb455a9933888a9cd267f6
font_01_sfnt_off00010096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10096 13500 bytes
SHA-256: 156ce1c3dd10e8bf5bd9d4f54bf875dcbe242e00693f69cd4ad229e19fe5f868
font_02_sfnt_off000129ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129AE 16232 bytes
SHA-256: 90063111fd84fc9d3bbe0e91a25c30074b178549c4c86487e0bfae44fa44017a