Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ee3cf6e635471e2…

MALICIOUS

PDF

76.9 KB Created: 2021-03-20 22:15:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: cd55a34eb66d8ecd5cecc59edfdf32b9 SHA-1: bf8e1073a9da7d8f621a48946ca631c5d680415b SHA-256: 3ee3cf6e635471e2ee9eb6158ea4700e5c35cc3bd216a5cd4b640a16aa19dae6
136 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, and exhibits characteristics of a social engineering attack (ClickFix). The embedded URL, https://jottigo.ru/wix?keyword=kaspersky+trial+reset+manually, suggests a lure related to bypassing software licensing. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, and the SE_CLICKFIX heuristic indicates instructions to the user to execute commands, likely to download and run a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://jottigo.ru/wix?keyword=kaspersky+trial+reset+manually PDF link annotation
    • http://item-mask.top/heart_of_darkness_joseph_conrad_espaol8hg3a.pdfIn PDF document text
    • http://edaruzal.xyz/lg_v20_battery_lifeby729.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/45314990-2172-4b34-9d46-12ff16330d01/what_does_code_do_mean_on_frigidaire_dehumidifier.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/comparing_mitosis_and_meiosis_worksheet_biology_if8765.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/721d9e0c-9bba-4013-866a-21028cdf1b0d/polygon_lesson_for_2nd_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a40ed8eb-260d-478d-8a4e-996fc8b85d8c/why_is_my_led_spotlight_flickering.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2509117-6eaa-40aa-a298-b152ccc43d6a/63767710292.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e38c71b-f47a-40a5-9895-92ba1e77242b/wazobulopexap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8586066-bd6a-4d20-bd5a-ca7b825098ec/swann_alarm_system_review.pdfIn PDF document text
    • https://s3.amazonaws.com/medaliwifufugel/who_is_glass_in_the_100_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb99008e-451c-42f4-bdf0-8971590bea1c/41366462601.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f91d1549-cdc8-403c-9425-fe411bd92f01/john_deere_310_backhoe_hydraulic_fluid_type.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6098e306-af4e-4f71-a460-2ba0171b0dcc/24062329088.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2f8843e-8a6b-41ba-910a-eb70ecfdd6b7/7596169345.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1347f199-a024-4064-b14e-ebbafa8e1281/38248469944.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee05067a-cd0f-47b0-9e66-05bd906e2dfd/bontrager_trip_100_instructions.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_off0000efcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCB 5100 bytes
SHA-256: 38c5abb906e5fa5a7c850a4b3283d8faf85e43818c293d5ce8386a81166de8d8
font_01_sfnt_off0001011c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011C 11080 bytes
SHA-256: d1b1ee51bd728436ed19b2a085194e7f93ebf29355c73bd78dabbed48301b438

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