Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4da2af9cefbf5ee…

MALICIOUS

PDF

84.2 KB Created: 2021-03-27 11:26:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8fbb384d448f583427d091a688eec89b SHA-1: b6e010060b45461a7460a4a8007f42b53e9f5e4e SHA-256: b4da2af9cefbf5ee2b30f0d7b54b8c29b5f8c4677fe5944743d151d9d0999c9e
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several pointing to suspicious domains and one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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/123?utm_term=grammar+for+ielts+collins+audio PDF link annotation
    • http://justamorem.com/tozafas3n3t.pdfIn PDF document text
    • http://ukranews.site/wewizalokepufopexc7qj3.pdfIn PDF document text
    • http://xesapuwax.mywebcommunity.org/zonusuvot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465133/normal_603ab54059ef0.pdfIn PDF document text
    • http://lovemecompletely.com/7023937587duhmf.pdfIn PDF document text
    • http://lajodibibodi.getenjoyment.net/69753378337.pdfIn PDF document text
    • http://arm-watch1.club/galil_parts_for_saleeu29u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388163/normal_602a749a972b6.pdfIn PDF document text
    • http://kawafopi.mygamesonline.org/63038598731.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504788/normal_605872ada1c76.pdfIn PDF document text
    • http://nowukusox.mypressonline.com/common_core_math_standards_kindergarten_massachusetts.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418385/normal_604b795dbea4f.pdfIn PDF document text
    • http://instgrmmverifiedbadge.com/undisputed_4_full_movie_in_hindi_dubbed_download_filmyzillahxzje.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/9b9b5e4c-7969-4b2c-9fcd-19a9aba066b4/14839473615.pdfIn PDF document text
    • https://c948e902-2437-43f3-9f1e-7aaad30688a7.filesusr.com/ugd/464a75_676e07f5bfb242478679bbb05e7a2913.pdf?index=trueIn PDF document text
    • https://eee5dff6-7331-416e-acdf-593d0c386862.filesusr.com/ugd/21e9e0_5b4914c70533472ebd16bb8b6003dbce.pdf?index=trueIn PDF document text
    • https://b8436764-02b3-4471-8711-1e8fed235cf0.filesusr.com/ugd/3b3fbb_a4ba6658b32943d48cf542c9d2b21e0c.pdf?index=trueIn PDF document text
    • http://sutexuvidag.myartsonline.com/minn_kota_riptide_terrova_80-lb._i-pilot_trolling_motor_24v.pdfIn PDF document text
    • https://156bb51f-0b62-477f-88ca-8620af00812b.filesusr.com/ugd/e3ff21_b3f686fb77144157a734b4f51bc064ca.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6402034-f8cc-4006-a276-4ceb3355a98f/jirejewiboxemip.pdfIn PDF document text
    • https://99470c7d-c692-4648-a7b8-36ea19db2883.filesusr.com/ugd/ab059d_6409547de9a74c7895303acd9d201e00.pdf?index=trueIn PDF document text
    • https://d668ac4b-7052-46b9-8d0c-7e282d24ced7.filesusr.com/ugd/00fc84_5c8d3e2b331a4f9c9f427bfb6b648867.pdf?index=trueIn PDF document text
    • https://69c5641f-197a-42c1-bef1-daa502c1f1d7.filesusr.com/ugd/948cea_44d3afca75d34ee59a79fa52a0e0f753.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE979 5200 bytes
SHA-256: a7e1d99e17164a9da7c610f378fc7240507ec90467953abcbec7b723e3b93dcf
font_01_sfnt_off0000fb14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB14 22472 bytes
SHA-256: f6a12683f94e65184ae8e86aeb5eba710a2512e4aa752923cb2281c935f27b76
font_02_sfnt_off00012c92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C92 16068 bytes
SHA-256: 5d72d630640305d452d914085fd6c65e0d8125198bed8028c282d44fd0327be8