Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dcbeb15e483acb9…

MALICIOUS

PDF

79.4 KB Created: 2021-03-18 20:11:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c9757b4b4f5b25c816d9bcc717b17f16 SHA-1: f78270d90bfe5cfce9936005983fd0262fc0f121 SHA-256: 6dcbeb15e483acb9c3fe971db072f7b670be04179938de3ca04d40b912df906c
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 0.9993

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://mezovuduw.ru/wix?keyword=dream+league+apk+download+apkpure PDF link annotation
    • http://velavedi.iblogger.org/walojakanekapag.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470982/normal_5febf87377bf0.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzosiboweja/6Nwiegi/challenges_experienced_in_management_of_information_systems.pdfIn PDF document text
    • http://pepojen.iblogger.org/cyberpunk_2077_frame_rate_xbox_series_x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412415/normal_604496b621c35.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375525/normal_5fc8263c62d41.pdfIn PDF document text
    • https://cdn.sqhk.co/novujarogoga/bNfRsgd/memoji_stickers_in_whatsapp_iphone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383308/normal_600fa238e3df2.pdfIn PDF document text
    • https://cdn.sqhk.co/xeloxilava/ha6gd6A/ringtones_galaxy_s7_edge_screen_replacement.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c554ddd-f480-4701-a32a-cbc2d4fe1708/how_to_install_self_adhesive_vinyl_tiles.pdfIn PDF document text
    • https://s3.amazonaws.com/panokojol/summoners_war_toa_hard_team_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/chrome_extensions_android_ublock.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/genie_pro_max_not_closing.pdfIn PDF document text
    • http://tokeximu.epizy.com/agitated_behavior_in_dementia_scale.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/ihss_timesheet_help_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fa917bc-1a1c-4956-b0f6-2612e6a11fda/what_biker_gang_wears_green.pdfIn PDF document text
    • http://rimaxuj.rf.gd/lixaresoxijuv.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/android_checkbox_xml_attributes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ea4aaca-4f0e-459b-9d5f-c85438773d11/nepapirenevoxozuzufizij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97df3de2-0e0c-4645-9e02-873bcfc18679/riduragibe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26efa792-6a11-40a7-9ff0-7e156efcd2b0/xujuvedajufakimodo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/246e6dd6-d88f-410d-a1c3-07d76d0c0f48/which_equation_represents_the_standard_enthalpy_change_of_formation_of_ethanol_c2h5oh.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c69f3e40-87e7-4802-ac13-c7f616720503/47685644253.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0368787-6de2-440c-b14e-bf06d4504f73/the_magic_school_bus_books_amazon.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_off0000f7de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DE 5256 bytes
SHA-256: d295d6cf30fdbc60a9516fb530ad983796771fbef54deada0ccfdabbe1d876c6
font_01_sfnt_off000109bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BC 11476 bytes
SHA-256: 3ddd79a48f3eaeaa20b82ca37731c9fc9249d50c2cdc8db57a1e0ff0fd88db97