Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c7043573608968c…

MALICIOUS

PDF

87.6 KB Created: 2021-03-28 19:13:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 960ef871e58cdc70dd497f6c50c589e1 SHA-1: ba66928f17bee7d7d7252eead9e4112f9fbf967b SHA-256: 2c7043573608968cc6579fb4bf04657affde863c934055a5fb6325bc028764fc
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm designed to attract traffic. The primary URL, 'https://zajinet.ru/wix?keyword=death+by+meeting+pdf+free+download', indicates a lure for users searching for specific content, likely to redirect them to malicious sites or download further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://zajinet.ru/wix?keyword=death+by+meeting+pdf+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449417/normal_603a82d1b22b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379363/normal_605560caa7013.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406482/normal_5fe1f764d6e3a.pdfIn PDF document text
    • http://dommasters.site/52464885349e912c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454048/normal_601cc922bc242.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451231/normal_600a576b9c890.pdfIn PDF document text
    • http://menetufebev.22web.org/hey_there_delilah_song_pagalworld.pdfIn PDF document text
    • http://naturfresh.fun/application_of_lean_management_practicesz2yy9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368485/normal_603112c7f25fc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ced6af22-cf5f-4df0-9cd6-2d424634d287.filesusr.com/ugd/3eed2b_fcfa9b3e503c40e3a2bd9e6fd0a4eef0.pdf?index=trueIn PDF document text
    • https://769966b8-4adc-437e-bba8-f198cf6e171b.filesusr.com/ugd/41a0b6_2aa807a236dc41e494c4cee6b1b9d20c.pdf?index=trueIn PDF document text
    • https://dc6b22d1-fd3c-476a-b8f1-b0505981f591.filesusr.com/ugd/ab5adf_b228fdf6712449bea5a5c59e7b4d591e.pdf?index=trueIn PDF document text
    • http://bodudubabafixe.rf.gd/formation_alveolar_bone.pdfIn PDF document text
    • https://a86a6b26-b473-4b55-b9aa-7628a2bff077.filesusr.com/ugd/4f270c_03983103aa0b4b9ba63e6eb1e62eace2.pdf?index=trueIn PDF document text
    • https://9eaa565e-fb97-40b4-b096-d6760803f699.filesusr.com/ugd/55e2c6_5f928750510e40708d68992e8c1e67e7.pdf?index=trueIn PDF document text
    • https://7c8f45b7-e058-4e27-bccd-8ee7dcb26900.filesusr.com/ugd/d5cf39_4fac3e2fa3b14f00a0e9c3524c1c4d98.pdf?index=trueIn PDF document text
    • http://dukutogesedu.epizy.com/how_does_nike_use_lean_production.pdfIn PDF document text
    • http://muzokusadozejog.epizy.com/foleturofujiv.pdfIn PDF document text
    • https://dc383e6d-b7a3-4e67-a88a-227fa542b6c3.filesusr.com/ugd/72b0e7_923d7d031b984236ae90fda65072b962.pdf?index=trueIn PDF document text
    • http://zabukek.rf.gd/befenujopizeraw.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C6 6548 bytes
SHA-256: b27c7a011d1e25a8740c16753f32df49003034e6b6973e84691b1598814ca5e7
font_01_sfnt_off0001191c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1191C 5612 bytes
SHA-256: 08feea31bf93d2f57fa14d2dbb7f16cc45a908f95047b5da379badaf87f7878e
font_02_sfnt_off00012c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C24 10712 bytes
SHA-256: eca3d33fb1cd6971976fe620a464779e0d149112e46ff0a9b9b49e3c2324ddaa