Malicious PDF — malware analysis report

Static analysis result for SHA-256 752ea38fe0605839…

MALICIOUS

PDF

77.2 KB Created: 2021-04-16 11:21:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6b528fa94b0d5369d41f5be31ab80595 SHA-1: d59dd2ffd601476988209edcc4d4afe53cb15f3e SHA-256: 752ea38fe060583937b2ac11b16481a4060d78f955260a56e95c2e159d2b4058
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/strik?utm_term=solid-state+physics+short+definition PDF link annotation
    • https://buzokiki.weebly.com/uploads/1/3/4/8/134853803/fasusi.pdfIn PDF document text
    • http://biwadevebudorif.22web.org/asthma_in_pregnancy_guidelines.pdfIn PDF document text
    • https://gazobibulome.weebly.com/uploads/1/3/4/7/134775133/e53654.pdfIn PDF document text
    • http://drive4mclanemilwaukee.com/95177230044teg35.pdfIn PDF document text
    • https://jonimewogil.weebly.com/uploads/1/3/1/8/131860125/mogekirakevaful.pdfIn PDF document text
    • http://ig-about.net/juruvajevovanajisudrjey3.pdfIn PDF document text
    • http://sq11mini.com/research_articles_on_employee_absenteeism946qe.pdfIn PDF document text
    • http://arenaprobet.com/ms_drivers_license_renewal_covidk2lgg.pdfIn PDF document text
    • https://bejixetixozivi.weebly.com/uploads/1/3/4/4/134499198/desiwakan_vaxaxobobego_dagaseseligosud_wiresajuvopejuj.pdfIn PDF document text
    • http://hookup157.online/dutilixepefiqsx6u.pdfIn PDF document text
    • http://1xbet-registr.site/para_que_sirve_el_entero_guanilmb0d7.pdfIn PDF document text
    • http://magonimiw.iblogger.org/liked.pdfIn PDF document text
    • http://oneplusonemain.xyz/first_spreadsheet_application_softwarew1bmh.pdfIn PDF document text
    • http://bupetud.xyz/8734486907kb5mb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gafawazela.epizy.com/beeware_for_windows.pdfIn PDF document text
    • http://rozesefotuduwef.epizy.com/christmas_acrostic_poem_template_tes.pdfIn PDF document text
    • http://wijobofeforot.epizy.com/jonodugusorati.pdfIn PDF document text
    • http://suwewonopega.epizy.com/veziwujeziliwawarus.pdfIn PDF document text
    • http://bebubizaguwadef.rf.gd/calendario_laboral_2020_canarias.pdfIn PDF document text
    • http://vupoxutefefa.rf.gd/mas_gente_toxica.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_off0000ee72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE72 5480 bytes
SHA-256: 0b9db896d4eefdb48c8cf65d91172d5fb19329021caec3a19f2c67b8c1cfedda
font_01_sfnt_off0001011d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011D 11348 bytes
SHA-256: 6bba5e25f1d485ddb38702c26f8170bdaa77c348ba02f6279c11bf76ab31cb3e