Malicious PDF — malware analysis report

Static analysis result for SHA-256 57bc89b8eb764b2a…

MALICIOUS

PDF

83.4 KB Created: 2021-03-20 00:40:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9f189c1a26da93d2ceca5b7aeb86ada7 SHA-1: 5942dc882bb70449f1336c512804217749eefaeb SHA-256: 57bc89b8eb764b2a4111db608ff3c60a3f7d9903c92031de1b194809b75bb53a
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a LOLBin command-execution lure. 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 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://jacksth.ru/wix?keyword=projectile+motion+word+problems+worksheet PDF link annotation
    • https://sezavifibeka.weebly.com/uploads/1/3/4/4/134463458/kunivi.pdfIn PDF document text
    • http://blue-tick-central.com/for_cause_and_comradeshrpkc.pdfIn PDF document text
    • http://pedumerik.sportsontheweb.net/integral_of_sinxcosx2.pdfIn PDF document text
    • http://foyou.store/915571539398j71.pdfIn PDF document text
    • http://bejisosubonito.sportsontheweb.net/16096168333.pdfIn PDF document text
    • http://bestpriceforukraine.xyz/android_developer_options_mock_location_apphy7ai.pdfIn PDF document text
    • https://cdn.sqhk.co/fegojujor/BkBidps/zeriv.pdfIn PDF document text
    • http://xedeporib.medianewsonline.com/dawalabevalituxenurizaves.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/Coljfza/20686375296.pdfIn PDF document text
    • http://tufodudem.mypressonline.com/88641468994.pdfIn PDF document text
    • http://mybiol.site/microsoft_windows_powershell_download_for_server_2008_32_bit096aq.pdfIn PDF document text
    • http://masalev.ru/learn_korean_alphabete07qr.pdfIn PDF document text
    • https://dusibijerike.weebly.com/uploads/1/3/2/6/132695870/wariparigax-lunimesubutuv.pdfIn PDF document text
    • https://cdn.sqhk.co/fikalibumi/uiejgjf/aurangzeb_full_movie_2013_free.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/uhaPgjX/fire_alarm_testing_report_format.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/6d1458ba-374b-4b8c-ae7e-3a1343ea1614/fanefiwikufidomi.pdfIn PDF document text
    • http://lesewewavofum.epizy.com/wacom_cintiq_pro_24_manual.pdfIn PDF document text
    • http://wereguvepowu.epizy.com/affinity_chromatography_methods_and_protocols.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ff590df-4326-4832-b56e-6bff92c479bb/what_does_endorsements_mean_on_your_drivers_license_south_africa.pdfIn PDF document text
    • http://nabafutig.myartsonline.com/modelos_de_inventarios_probabilisticos_y_deterministicos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3e2b0f9-9aad-4242-bbed-772b803464e5/how_to_do_speed_workouts_running.pdfIn macro / runtime command snippet
    • https://uploads.strikinglycdn.com/files/983db191-d8a7-4330-9c6e-4d202904a9fc/how_to_use_a_vicks_vaporizer.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_off000105ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FF 5476 bytes
SHA-256: 560434bb170868205dc31bbf47c2d706ba89d861bebca7c9717a46169f8be925
font_01_sfnt_off00011880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11880 11476 bytes
SHA-256: b7fe5900135c7878202e6f32b3d6043ef8ab22e5ac479d401ee7cc3782d1003e