Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7c76f547e01f89c…

MALICIOUS

PDF

83.6 KB Created: 2021-04-16 16:13:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3f7e39120ff2f1760988e1e88c412f5b SHA-1: 723c8d426e0a62846f92f9b37fc805665021df34 SHA-256: b7c76f547e01f89c11e75ce19c76477a8c0fef49db265ac59d5d48282f01a66a
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 0.9925

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://soxebez.ru/strik?utm_term=open+bunker+hill+safe+without+key PDF link annotation
    • http://fajufoturesu.sportsontheweb.net/supraspinatus_impingement_exercises.pdfIn PDF document text
    • https://cdn.sqhk.co/buzovegom/TsAhdQ3/guilty_crown_op_2_lyrics.pdfIn PDF document text
    • https://cdn.sqhk.co/bokupajokim/d6ZEOjh/regoridesezofijumim.pdfIn PDF document text
    • https://cdn.sqhk.co/loberutebe/gid78ck/57617704093.pdfIn PDF document text
    • http://modababolekud.22web.org/how_to_thread_a_brother_ls_1520_sewing_machine.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/2fjdugc/candomble_religion.pdfIn PDF document text
    • https://cdn.sqhk.co/tuledapozato/j9gdmij/t_i_vua_bong_da_2020_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/ganuniwiku/XEheqge/43026521608.pdfIn PDF document text
    • https://cdn.sqhk.co/gizulakofo/idgfYHi/gba_emulator_for_pc_free_download_full_version.pdfIn PDF document text
    • https://cdn.sqhk.co/nebuwaxisiw/iiBgghh/5668270219.pdfIn PDF document text
    • https://cdn.sqhk.co/gozigawefo/he0iaig/songs_carrie_underwood_sang_on_american_idol.pdfIn PDF document text
    • https://cdn.sqhk.co/wanadujogo/Ojihjjf/wazedazisitomog.pdfIn PDF document text
    • https://cdn.sqhk.co/mojubemuwek/jcjfRie/bridge_construction_simulator_v1._2._7_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/kofuvufexo/wjiaK1P/27789833970.pdfIn PDF document text
    • http://solerizimifo.iblogger.org/gender_barriers_to_communication.pdfIn PDF document text
    • http://bogipeborowe.sportsontheweb.net/11048404998.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://wutejaxevewef.myartsonline.com/sudofinijupovokejado.pdfIn PDF document text
    • https://s3.amazonaws.com/makixibawumebol/apc_ups_be550g_manual.pdfIn PDF document text
    • http://lukuvisebexa.epizy.com/javascript_web_development_tutorial.pdfIn PDF document text
    • http://fatavetotujel.onlinewebshop.net/45135398664.pdfIn PDF document text
    • http://rafoputoxuxu.epizy.com/aberlady_primary_school_uniform.pdfIn PDF document text
    • https://s3.amazonaws.com/nowonovege/cbse._nic._in_2019_practical_date_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/50696692134.pdfIn PDF document text
    • http://nekaluro.rf.gd/cutting_board_color_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/52065088069.pdfIn PDF document text
    • https://s3.amazonaws.com/dibedamoka/cast_of_little_house_on_the_prairie_season_9.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC5 2900 bytes
SHA-256: a28fcc4ba65d8171a55e8b87d646ac5d1dd213f66ab2b0026fd39e5ca5d32d1a
font_01_sfnt_off0000f907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF907 5296 bytes
SHA-256: fa4a27988d37866442ebd03466c03ab2c47b9f2beca02d081b4b656726d3f560
font_02_sfnt_off00010b11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B11 10916 bytes
SHA-256: 9b6fc980b9a341ba1781235cd3a8615894d11d830e5227317fe582960ccffe17
font_03_sfnt_off00013083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13083 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333