Malicious PDF — malware analysis report

Static analysis result for SHA-256 b40526f4b57cb02f…

MALICIOUS

PDF

84.6 KB Created: 2021-03-18 07:18:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 558dabe645bbb3f1d985772ccc9b03a0 SHA-1: 44f8b47ef5f3b9f06560c4fd20c2ecd686e83e06 SHA-256: b40526f4b57cb02fcdff4f9c97495145282517c495a0c16fa68b6dd1f6945a28
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, with a significant portion pointing to disposable hosting and potentially malicious domains, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the structure and embedded links are indicative of a malicious PDF designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://resalured.ru/award?keyword=naming+alkenes+pdf PDF link annotation
    • http://bupro.asia/funokuvilekonafup1els.pdfIn PDF document text
    • http://maykistore.ru/what_is_power_circle_diagramtw4yn.pdfIn PDF document text
    • http://pestore.pro/20865365498g3prm.pdfIn PDF document text
    • http://voicebftyi.com/are_wirehaired_pointers_good_pets1j48r.pdfIn PDF document text
    • http://help-feedback-amzn8.xyz/kujixozakotekorepigazimolrih8n.pdfIn PDF document text
    • http://circleshtang.xyz/guitar_chords_basic_for_beginnersbijh9.pdfIn PDF document text
    • http://vengriya.space/hierarchical_clustering_numerical_exampless82g.pdfIn PDF document text
    • http://lessonsonline.site/670510349055vwsv.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://beruleruz.rf.gd/breath_of_fire_6_english_version_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7aa43843-1c2d-4a50-a23b-a7b1e07433a8/subok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9da5929-24be-48bc-bc37-196d2b3e1d15/what_are_the_3_compartments_in_a_washing_machine_drawer_bosch.pdfIn PDF document text
    • http://xepumobokuv.rf.gd/gotex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b46c7167-c464-4ef1-9202-e0ae0bc61799/why_wont_my_apple_tv_remote_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9873fdde-c263-48a0-9f46-72d797c0b740/how_many_polar_bears_have_died_due_to_climate_change.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9dd9294-2e42-4dd7-a4d0-f6d24a8b10e2/duwezuref.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66385d2d-4b85-49d3-9428-612a397c4dd2/2001_kawasaki_vulcan_1500_nomad_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9aa962f5-0833-4c53-8862-4181f3059fab/kenmore_ultra_wash_dishwasher_filter_location.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/678295da-7333-4b7c-9793-bf206bce8b75/22730419169.pdfIn PDF document text
    • http://wiwazisumi.rf.gd/gatukibopupobukalijogap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93dbed68-3ca3-43ba-9138-6d8b5058da7e/how_to_remove_dyson_v6_animal_battery.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB9 4896 bytes
SHA-256: 7117d62e43bbe6d1fc1fa75ecd915e7b3e226bf97f36b32a2020593b6d92b061
font_01_sfnt_off00011045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11045 11440 bytes
SHA-256: 5e413bbc515eadafd5ee17f1155087ed3b35d9963717bdc1757a811d5c4d2ac6
font_02_sfnt_off0001371f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1371F 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378