Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d3b90701b6099ba…

MALICIOUS

PDF

78.4 KB Created: 2021-05-30 02:12:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 11780079c3a5574ef61b144091886e46 SHA-1: 1fc3bab62a5f9bf79f1cb91b35e7777d4873aaf5 SHA-256: 6d3b90701b6099ba7854bc12b917e7e572cc3d81bb1bc8e52bc3ed83ab61e849
226 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic suggests the document instructs users to copy and paste content into a command-line interface, a common tactic for executing malicious commands. The presence of numerous external links, some pointing to potentially disposable hosting, further supports a phishing or malware distribution scheme. The primary URL identified is likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://druttle.ru/strik?utm_term=download+stop+motion+studio+pro+apk+gratis PDF link annotation
    • https://gopilabuvimira.weebly.com/uploads/1/3/1/4/131453416/5065e154f7b4f4.pdfIn PDF document text
    • https://finirawex.weebly.com/uploads/1/3/2/7/132741073/933692.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369762/normal_6007c70a83a72.pdfIn PDF document text
    • https://maloxozalujov.weebly.com/uploads/1/3/4/6/134624338/9224577.pdfIn PDF document text
    • https://mizevazorabij.weebly.com/uploads/1/3/5/3/135347525/bigapezezaso_musinug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379032/normal_6018a98bafc6c.pdfIn PDF document text
    • https://siralukamowifi.weebly.com/uploads/1/3/1/4/131407299/9577755.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502439/normal_6047e5509694a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495551/normal_60331a3066c44.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/a3ae22a4-a1eb-4a08-933a-94c2d972f6ae/motorola_surfboard_sb6141_docsis_3.0_cable_modem_firmware_update.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6eb45f61-7b85-4de6-a7e0-583b8faf513d/digital_marketing_course_in_delhi_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e58ec724-f1d1-4d25-817a-9be0e3eea00c/mpk_mini_editor_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1867eb3b-45ca-4d38-b55b-04b200c2438d/lopuvoviguzedabiruxij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dd79e71-4194-48e5-b701-f3aa114fbe41/why_was_god_silent_during_the_intertestamental_period.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5763e78e-7874-409b-b46d-d2ff91fc8416/68514043877.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fafd0b85-6339-4a1d-ad2b-f958057b246b/whirlpool_duet_front_load_washer_maintenance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b55688d9-732f-4482-bbaa-c7ec8c5304f6/how_to_clean_tefal_optigrill.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3eaa8a41-11a3-4556-9e94-eb6171c3cefd/ford_mustang_gt350.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/085162d5-45d9-40f6-b795-9545b2c77a07/delta_monitor_shower_handle_no_set_screw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fae22804-e009-4d90-977a-51c638d6ce6b/kitchenaid_artisan_5-quart_stand_mixer_accessories.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c3f3610-361e-4578-98a5-f41216407c22/72563763220.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42d5bc62-7e38-48d4-8d2e-84255ee5e1a7/how_to_multiply_and_divide_in_excel_formula.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a45ea38e-e9be-46b8-94fc-d825ad024be0/39029129114.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23aa5a81-1dab-4d70-8f7e-7c113d24e954/5596818767.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_off0000f3b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B8 5436 bytes
SHA-256: e83a6efd98ae9261bddfae53af602c89f8a1502332dd593e37dd35cbc3b4bf18
font_01_sfnt_off0001063c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063C 10948 bytes
SHA-256: 3d79463dcef08486d33f3419912efe73dc1663cc0ec88c867a0c9741d3f2c8f1

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