Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a8dc435256a694…

MALICIOUS

PDF

188.1 KB Created: 2021-04-13 05:16:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 1c2db268334c68fe1f23285f6d45fbd1 SHA-1: 2897d96006ae6e09d9d7fd90b83ca7ba6b3d9dcb SHA-256: 83a8dc435256a694aba32bb73b912dec2c334e578c2a5ed9633a106c677ffe6c
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a large number of embedded URLs, many pointing to disposable or suspicious domains, suggesting a phishing or redirection attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://kuzutuzo.ru/strik?utm_term=arnold+schwarzenegger+weightlifting+book PDF link annotation
    • http://ersoil.fun/tasipajudokotowaliferwjxoz.pdfIn PDF document text
    • http://smartroom.pro/carta_poder_como_llenarla0c1im.pdfIn PDF document text
    • http://solusaxisabo.scienceontheweb.net/laretexasefifofoxupuj.pdfIn PDF document text
    • https://dufofisejufosu.weebly.com/uploads/1/3/4/8/134875198/1b115e91.pdfIn PDF document text
    • http://sovadarasuzepa.iblogger.org/cbse_class_12_biology_ncert_book_download.pdfIn PDF document text
    • https://zeberafuduzugag.weebly.com/uploads/1/3/2/6/132682167/4ccb90f81ed.pdfIn PDF document text
    • http://gipogup.sportsontheweb.net/menatagevoruxagixuxiwiboj.pdfIn PDF document text
    • http://eglo.club/bsa_personal_fitness_merit_badge_worksheetc5cht.pdfIn PDF document text
    • https://kexizinakit.weebly.com/uploads/1/3/4/8/134870698/3732078.pdfIn PDF document text
    • http://nout-prodat.site/wow_legion_affliction_warlock_guidefdhip.pdfIn PDF document text
    • https://dulumomotuvubu.weebly.com/uploads/1/3/4/7/134759228/buredegojaka.pdfIn PDF document text
    • http://ing-cliente.com/how_to_connect_both_hype_wireless_earbudsiugvn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://godutugogusapa.rf.gd/how_do_i_program_my_directv_remote_to_control_the_volume.pdfIn PDF document text
    • http://tixinova.rf.gd/anti_ragging_form_by_student.pdfIn PDF document text
    • https://44879a12-c10a-431c-a98a-7de142752d0f.filesusr.com/ugd/bb4607_7bab294f5fe64e27b119b819f3b26494.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ccfee05-e88a-41af-b398-376c1a42c54e/how_well_do_you_follow_directions_worksheet_answers_french_workman.pdfIn PDF document text
    • https://4f0754e2-f0c4-47db-826b-83042027646c.filesusr.com/ugd/7a11b0_b7f9a015f30b42298f8deb86ad312ec4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/78b175bf-033d-4d30-8567-822d034bd009/how_much_does_a_trane_unit_cost.pdfIn PDF document text
    • https://8319d365-0190-44ee-b2f3-e76f6fd230eb.filesusr.com/ugd/112488_4d43c4efc88e425aa97f29e6587764c3.pdf?index=trueIn PDF document text
    • https://3c8197b3-f999-4f29-b3da-fbdfea3dbf34.filesusr.com/ugd/0047a4_e47af2dc121c4486b20baab00f5bf52c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/61b2ef89-1366-4433-9c99-a884d078224b/caracteristicas_del_derecho_procesal_civil_panameo.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
    • 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_off0002893b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2893B 5616 bytes
SHA-256: c374137b67f8bc85b7665a83a09900401906cc76c034660293370508b9426bd0
font_01_sfnt_off00029c71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29C71 15852 bytes
SHA-256: 4c3dc1eefa8f008665f69f41856a7bf8512496ef4946ff963acfac330d511c2c
font_02_sfnt_off0002cd8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CD8D 16060 bytes
SHA-256: 5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330