Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4098fc444470db2…

MALICIOUS

PDF

159.8 KB Created: 2021-04-03 20:16:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 53a3a7bad91530310881b39aece42e3f SHA-1: 7d47f30024d90f9780d9db2568c2688c28f77fb6 SHA-256: d4098fc444470db2f944d9eef68751cb756c4bacc8a30192f16763d105d79995
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains numerous external URIs, including one pointing to zajinet.ru, suggesting it's designed to redirect users to malicious sites. The document body, though heavily corrupted, contains references to 'worksheet' and 'wkhtmltopdf', reinforcing the lure of educational or utility content to mask malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/wix?keyword=inconvenient+truth+worksheet
    • http://presentinsta.online/weider_8630_manual_espaol8l7jt.pdf
    • https://cdn-cms.f-static.net/uploads/4448124/normal_6039e7807dfab.pdf
    • https://cdn-cms.f-static.net/uploads/4481424/normal_604654cd023a0.pdf
    • http://fodefon.getenjoyment.net/sulolito.pdf
    • http://fijubigatusurov.scienceontheweb.net/job_interview_vocabulary_words.pdf
    • https://cdn-cms.f-static.net/uploads/4417408/normal_602154962265a.pdf
    • http://antonioit.fun/10695545358te0kj.pdf
    • http://giwitap.getenjoyment.net/85631472372.pdf
    • http://gomesuzos.mypressonline.com/najodofugimek.pdf
    • http://gudelew.mywebcommunity.org/ferid.pdf
    • http://prognoz-football.club/374270821980brth.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://buvafejeles.rf.gd/vivid_verbs_worksheet_3rd_grade.pdf
    • https://s3.amazonaws.com/legapatatezisa/33876038457.pdf
    • https://0e75ab8e-f6a1-4360-bef2-1d94e06fde4e.filesusr.com/ugd/c0518c_9aeaae3a496d493f928fd1540cd22507.pdf?index=true
    • https://s3.amazonaws.com/wemazun/36512828105.pdf
    • https://30c74dc1-c3f2-4e71-8253-1ec84f3b94e1.filesusr.com/ugd/b8c6fa_75f37cf3c3f346f8a9d67421c55f2f42.pdf?index=true
    • http://kadelidiror.epizy.com/johnsons_reconstruction_plan_strengths.pdf
    • https://5634f520-c25d-421d-ab67-3d94505d13cb.filesusr.com/ugd/1b85ab_1cb54b68aa8246a283ae1180b49ceeb2.pdf?index=true
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_d92f2646fcf940d084ac8ec82223936c.pdf?index=true
    • http://bikikifuxax.epizy.com/bohemian_rhapsody_classical_guitar_notes.pdf
    • http://kijepelekub.rf.gd/cholestatic_jaundice_guideline.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_off00023bf2.bin
bf3efec5ee63b146512f6234ef1e4f51972c89b41eb43b5b6c58ca1a3a7a499a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x23BF2 4796 bytes
font_01_sfnt_off00024c58.bin
4832ce5dd36b64f7ceab823df300d00a0156713ff2948832e8bbe6a804353d78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x24C58 11132 bytes

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