Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6638dc8a6ef7d6b…

MALICIOUS

PDF

77.1 KB Created: 2021-05-16 18:12:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 784e97a96f24fb0959a57d94b8b531b3 SHA-1: 211d031b45e85236c6e9ca451da836a4b11f0186 SHA-256: c6638dc8a6ef7d6b51964dfa22719b50c843bf8d431c0989dac7c7e7508297c6
126 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including ML and ClamAV, as malicious and phishing-related. It contains numerous embedded URLs, with a primary suspicious URL pointing to a domain associated with phishing campaigns. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://vilenefex.ru/strik?utm_term=when+should+you+take+the+fe+exam PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451039/normal_602c16782faee.pdfIn PDF document text
    • http://vobarijijagurar.22web.org/ejemplos_de_como_hacer_una_minuta_de_trabajo.pdfIn PDF document text
    • http://xamurewezoviw.iblogger.org/aisin_09g_transmission_fluid_change.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425483/normal_60419758352b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365636/normal_6026d21cd22f5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://muxovunibo.epizy.com/88806764726.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/708f63bc-4cee-4374-97b4-dce92001899c/40682816330.pdfIn PDF document text
    • http://wuwedilejom.myartsonline.com/personal_branding.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adb730e4-ac47-4801-937b-a58c956f4972/lenovo_thinkpad_t420_graphics_driver_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/005e6dcd-d482-4f24-9823-6245e18ea42e/how_to_turn_on_my_webcam_on_my_lenovo_laptop_windows_10.pdfIn PDF document text
    • http://sazasewugekupej.onlinewebshop.net/85690069600.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c0824de-0bfd-4446-ac65-616af405378e/46779654864.pdfIn PDF document text
    • http://wekikoki.rf.gd/dusuvenipudu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c0e1ce2-0ed7-4fb7-bada-0bf7e0e438a8/dd_3.5_ship_stats.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fedc7742-9da7-42a7-b86f-7e17414017de/word_choice_exercises_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d67205e-20bd-4691-895d-c369a967842d/what_does_pst_mean_on_xfinity_cable_box.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd8f4499-7b0f-435d-94ce-b29474d4ef1f/twilight_breaking_dawn_part_3_release_date.pdfIn PDF document text
    • http://rawowixit.epizy.com/fejobomufumabofenapi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfb76e17-7356-4d51-ab51-f0a026a76eef/fisemonowelev.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_off0000eec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC8 5300 bytes
SHA-256: f0482a1d08aa6d67e2a4fd2cbede2e783aa5571ddf98b8a9712d498807e171e2
font_01_sfnt_off000100c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C2 11368 bytes
SHA-256: d4e3f0677ab022b191d91af4fd699db13fe2402415a355c01ea5af25d3357c0c

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