Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cd5a90d51d89b44…

MALICIOUS

PDF

75.5 KB Created: 2021-03-05 17:26:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a6419847e539c9c6908ad675630e4be2 SHA-1: d4d97a94137037c2aa9626d660e1159c8bf48172 SHA-256: 4cd5a90d51d89b448f9cfd4950f99030ad25ee2f1c2d37ed0cb62c4aabc19a06
104 Risk Score

Malware Insights

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

The file is a PDF document flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an external URI pointing to a suspicious domain, suggesting it may be used to redirect users to a malicious site or download further payloads. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://botokaw.ru/strik?utm_term=what+size+chain+does+a+stihl+ms170+use PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4426675/normal_5ff215b8843d9.pdfIn PDF document text
    • https://cdn.sqhk.co/terisuzuji/hijygfk/radio_italia_anni_60_canale_tv_puglia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392452/normal_60240ff7aaed5.pdfIn PDF document text
    • https://cdn.sqhk.co/rinugezig/f8RmaP9/x-_rite_colorchecker_passport_software.pdfIn PDF document text
    • https://cdn.sqhk.co/nujusowidom/jgT2jeT/mavalinisutalesex.pdfIn PDF document text
    • https://cdn.sqhk.co/gediwuwanol/iHghion/gusutowamugamuvosomi.pdfIn PDF document text
    • https://cdn.sqhk.co/nazamesuwute/eghqx6I/40875827656.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401712/normal_5ffa865344b9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465543/normal_6032c55203125.pdfIn PDF document text
    • https://cdn.sqhk.co/kepilujofeje/hiSfij6/snapping_turtle_animal_crossing_price.pdfIn PDF document text
    • https://cdn.sqhk.co/ravunovibuxi/fiiiia2/the_wolfman_book.pdfIn PDF document text
    • https://cdn.sqhk.co/jefapukawore/jiJLIhd/connect_smart_life_to_apple_home.pdfIn PDF document text
    • https://cdn.sqhk.co/budotedo/ghgg8y1/motor_vehicle_inspection_station_mays_landing.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/27b873a6-a6ed-4135-8304-d5beb025685d/can_you_use_a_cpap_machine_without_a_humidifier.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ca543e4-71d5-40f7-a8c0-be78ec3ae07d/how_to_reboot_an_old_kindle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d67be0a-6022-4f8a-ab3f-32ece7e6858d/doxise.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6031822c-bf59-4531-99ea-8d34c4a76dce/50803865414.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6e24836-1988-407d-9a63-0c483ccf8bfe/watch_big_little_lies_season_2_free_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2b8f0ec-4f49-4dc9-8126-5a2f3b75fd03/wuvoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a1e625b-7c18-453b-a24d-ab6d977815c8/garmin_vivofit_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2a31d47-940d-4a9c-956b-4a8209cd1ea2/25984874143.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f52c1665-fc1d-4549-81b6-976ccecbbf54/gatokiba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82a5f7dc-46d4-48f3-aa49-09208356adcd/harbor_breeze_mazon_ceiling_fan_bulb_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a1b80c4-466a-4ce1-a262-ade346ff78c7/pemurifuganodiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/531a3d5b-2890-4c32-ac06-2b300d7de1a8/how_to_do_cover_page_for_research_paper_mla_format.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_off0000e851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE851 5420 bytes
SHA-256: a29a2d8836981f4b96f13d91b0f1c9b9d21d8549cb9d20cd80ae3acbcfdee7e3
font_01_sfnt_off0000fab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB5 11036 bytes
SHA-256: 53dd002f3b57da979a5f6dc1a96efc4959a8e557d297d70a03b15de0fb8a4e19