Malicious PDF — malware analysis report

Static analysis result for SHA-256 eda50daad8d249d5…

MALICIOUS

PDF

76.0 KB Created: 2021-04-12 13:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 170ba3d217611e76584e4780072281bd SHA-1: 7ace9fd0cf29d373470f3ebc3e4c10920bd3217d SHA-256: eda50daad8d249d5509634e1a2d0d680bafdf55e66b833c4c5215f21b56dd958
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, including one pointing to 'nipisod.ru', which is flagged as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to a malicious site.

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://nipisod.ru/strik?utm_term=loto+6%252F49+din+16+feb+2020
    • https://cdn.sqhk.co/nixagigad/jfibhir/94903470508.pdf
    • https://sapuvitajesi.weebly.com/uploads/1/3/0/7/130776539/5583261.pdf
    • https://cdn.sqhk.co/bikuloxisage/Wjifidh/why_is_my_hopper_app_not_working.pdf
    • https://cdn.sqhk.co/badiwugaleko/ehfjhjj/wedifolasa.pdf
    • https://cdn-cms.f-static.net/uploads/4475196/normal_60695e130ad2b.pdf
    • https://static.s123-cdn-static.com/uploads/4464541/normal_5fe51b743fd59.pdf
    • https://cdn.sqhk.co/sategexarom/HjgZhjx/vovasidobuzarawores.pdf
    • http://nakanilo.club/infamous_iron_man_funko_pop_release_dated0y6x.pdf
    • https://cdn-cms.f-static.net/uploads/4471948/normal_603b872b81b6a.pdf
    • https://womogidukiwu.weebly.com/uploads/1/3/4/8/134873304/893f9f9.pdf
    • https://cdn.sqhk.co/kosadara/bjiRLii/vufevunijijuxab.pdf
    • https://devudupaf.weebly.com/uploads/1/3/4/8/134880603/fiwobadizenoru_gudejopuvotef_mezajetivula_rusagirupafo.pdf
    • https://rofujerejikuf.weebly.com/uploads/1/3/5/3/135388349/kexiruzeketuxemu.pdf
    • http://detonic-official.website/english_reading_practice_passagesl2ax0.pdf
    • http://damvglaz2.xyz/ejemplo_de_minuta_srl_peruana8ueul.pdf
    • https://cdn-cms.f-static.net/uploads/4485152/normal_60634b787cca6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d1897088-ef6e-4b60-8303-910b4b551fc1.filesusr.com/ugd/4cfbbd_ef778b4c83c74d5380f8011f0dfb3069.pdf?index=true
    • https://53ebb62d-ddaf-432f-8dc3-1f4746653467.filesusr.com/ugd/bbd3cf_be473366c249488aa31d80828774b027.pdf?index=true
    • https://74bb8966-1fc2-43cb-a641-24c20f380d28.filesusr.com/ugd/84c7b5_414a8d18c3904286954cdc2416b56e8f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a5c7f40f-ac91-49a8-9cdd-1cfeec7f94f1/taekwondo_classes_for_adults_near_me.pdf
    • https://uploads.strikinglycdn.com/files/5b26e967-48b2-4f58-9726-db86f5662b44/read_appsettings.json_c_.net_core.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_off0000ec8e.bin
f19e5ae639bd5ff4862671d1d138ff1e63882602efdea04d4cf424369447a011		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8E 5228 bytes
font_01_sfnt_off0000fe85.bin
f8916d20e8207ddcbd8bd74637e7a029d255215457c1def3e043d1125e263e3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE85 10776 bytes

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