Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e26f85fc22a2f93…

MALICIOUS

PDF

70.6 KB Created: 2021-04-06 15:40:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 858184e82a002383d67a7a527be679f8 SHA-1: a487d1d3478fb0628aede741e5dc3249cad58786 SHA-256: 3e26f85fc22a2f9376cbd49635a5345afe4a474c8440f800aed46ae908f5d75a
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one identified as a potential phishing lure related to an 'Alpena weather report'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or redirection mechanism. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/123?utm_term=alpena+weather+report
    • https://cdn.sqhk.co/gapobuzijiru/7wgegd8/xedetubaduvizukutow.pdf
    • https://cdn.sqhk.co/vegedusovo/HOhfjhx/lisuwunibidizebenov.pdf
    • https://cdn.sqhk.co/xewasejeve/Hjhjdh4/biomedical_reports_journal_impact_factor.pdf
    • https://cdn.sqhk.co/gaxumisi/hhbrheF/87393902721.pdf
    • https://cdn.sqhk.co/nogorodizet/hjhbuUo/best_free_voice_changing_software_for_windows.pdf
    • https://cdn.sqhk.co/tenotitur/3LNEjjW/10455987937.pdf
    • https://cdn.sqhk.co/zaweniwefi/jdhafhi/25929102109.pdf
    • https://cdn.sqhk.co/zirixegip/hfJQHhg/view_caller_caller_id_spam_blocker.pdf
    • https://cdn.sqhk.co/jesupesiparu/hKFSidX/jeveru.pdf
    • https://cdn.sqhk.co/sexipemajim/javEqhh/1263390144.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_ed3edd0690c045adb4a360e1d1651465.pdf?index=true
    • https://467375c7-a7a6-4806-a9b7-892c2a528f89.filesusr.com/ugd/911174_c8071302d13747c58f92ef4d3e35ef96.pdf?index=true
    • https://uploads.strikinglycdn.com/files/271a127f-97ac-41d6-9b5d-659f143bf5dc/rejexelijuresab.pdf
    • https://uploads.strikinglycdn.com/files/0aec0c2b-d1e9-4d5c-8b57-3db94b104997/dell_vostro_1500_flashing_red_battery_light.pdf
    • https://8772a198-af03-49ef-8724-5feb7546cb8a.filesusr.com/ugd/436f04_e3fbc304f13c4728b0ac4ad9f3a1c0b1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b21b398b-4b50-4412-be3a-a67072d6a5ee/how_to_install_petsafe_basic_in_ground_fence.pdf
    • https://uploads.strikinglycdn.com/files/c185cc6a-a348-4519-8567-f3b1dba51737/2015_mercury_15_hp_4_stroke_specs.pdf
    • https://uploads.strikinglycdn.com/files/6347b690-62ce-465b-8430-b57593cc2b8c/giwusitogi.pdf
    • https://uploads.strikinglycdn.com/files/fda46895-094e-43e8-86ce-f0ea67f2cf72/excel_if_then_else_function_multiple_conditions.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d826.bin
495f45f9fd588ce9018530e7b88c6eb1f4c9c57e705414f18ed0358a384126cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD826 4812 bytes
font_01_sfnt_off0000e88c.bin
ff33b92368a3f8b247cad435f144a44ff003c0aa30663f68dfbe8525555825d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE88C 10648 bytes

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