Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ad66893f1fc55c9…

MALICIOUS

PDF

79.3 KB Created: 2021-03-16 10:05:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 7ad3e770c0fcfa20b9041953c0017a62 SHA-1: 0dced52015c9e16dddc5999c48662f669c61495f SHA-256: 5ad66893f1fc55c944dd065a31345cb835a0555f8bcd98f806091b042cd3573b
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a significant portion pointing to disposable hosting and exhibiting link farm characteristics. One prominent URL, 'https://vilenefex.ru/wix?keyword=startopia+tools+guide', is directly associated with a heuristic firing indicating an external URI. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/wix?keyword=startopia+tools+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388282/normal_6028f33b0d82c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451575/normal_5fec55c6747b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382631/normal_5fd26fc137d22.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368496/normal_5fc8b37326ff7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465719/normal_603ea9bb99fee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502439/normal_601ced55ca00f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403128/normal_5fd6854fae826.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420438/normal_6007a454e45c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425217/normal_604b758a81d9d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pisik/chandni_chowk_full_hd_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c6667ac-2ede-41e0-9488-33933ba8d3a6/what_does_way_of_life_mean.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/uc_browser_app_for_android_mobile.pdfIn PDF document text
    • http://peruzaropaxox.epizy.com/swann_smart_security_system_2k_series_1080p_6_camera.pdfIn PDF document text
    • http://xoxobesoxiti.epizy.com/36088104320.pdfIn PDF document text
    • https://s3.amazonaws.com/netinuwa/74547899847.pdfIn PDF document text
    • http://xarozitapakegur.epizy.com/mozofe.pdfIn PDF document text
    • http://wajufuful.rf.gd/how_much_is_rhonda_byrne_worth.pdfIn PDF document text
    • http://gorefoverotiw.epizy.com/br_worksheets_studyladder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f785a94c-d3e8-4e2e-b955-9e3a80c4f2db/rita_mulcahy_pmp_exam_prep_9th.pdfIn PDF document text
    • http://vapovalexuma.epizy.com/color_codes_for_html_and_css.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_off0000f897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF897 5228 bytes
SHA-256: 0c2fee0a4483c5436425f948ca1b02a225a4e5852e887496ed0d91f90f392a23
font_01_sfnt_off00010a66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A66 11080 bytes
SHA-256: f52f8a3dcd795602534975ae95887c762edf5c712c0244526962db64d207ec68

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