Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3894eebdcb72c30…

MALICIOUS

PDF

79.5 KB Created: 2021-03-30 17:24:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 7ca983ded198f99f3fada734087ab6e1 SHA-1: 5b213128ee7e17eaaddbd4415942b40d0c65e76e SHA-256: f3894eebdcb72c309ba155564a36ab578fe95144895b6bce9fb36227b5d8504d
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to distribute traffic. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. The presence of a 'SE_DOWNLOAD_BUTTON' heuristic further supports the lure-based attack pattern. Although no scripts were explicitly extracted, the ML classifier and ClamAV detection indicate malicious content, likely leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 7

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://seumenha.ru/strik?utm_term=english+grammar+pdf+class+10+ssc+board PDF link annotation
    • https://beritugemob.weebly.com/uploads/1/3/4/3/134332724/5713462.pdfIn PDF document text
    • https://bejeselujolir.weebly.com/uploads/1/3/1/3/131379719/pewev_tiwiwevenugo_kipanulegixifi_tirifutodure.pdfIn PDF document text
    • https://tosulabemolajeg.weebly.com/uploads/1/3/1/8/131871730/a676704dd.pdfIn PDF document text
    • https://dubibezu.weebly.com/uploads/1/3/1/4/131453247/9b144245b8a1ea0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465393/normal_6027c2793e640.pdfIn PDF document text
    • https://tezijiso.weebly.com/uploads/1/3/4/6/134690371/9095723.pdfIn PDF document text
    • https://xiwupezarevapo.weebly.com/uploads/1/3/2/6/132681984/mugotalevimebarobil.pdfIn PDF document text
    • https://falatunasozenu.weebly.com/uploads/1/3/4/7/134762474/xivot.pdfIn PDF document text
    • https://jesemokomu.weebly.com/uploads/1/3/4/6/134687046/lumetaluregazifolum.pdfIn PDF document text
    • https://xoludifatak.weebly.com/uploads/1/3/4/4/134477652/9828132.pdfIn PDF document text
    • https://xumipapabof.weebly.com/uploads/1/3/4/6/134609146/zerexavim_wuguzazu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490515/normal_602c82983acfb.pdfIn PDF document text
    • https://rajuwirorevub.weebly.com/uploads/1/3/5/3/135306937/5311342.pdfIn PDF document text
    • https://belibezininu.weebly.com/uploads/1/3/4/8/134850089/dafe3.pdfIn PDF document text
    • https://zevebijupaxize.weebly.com/uploads/1/3/4/7/134754497/lagalifuzonefe_biropo_zojow_fozagagaparex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402294/normal_601054c2bb46c.pdfIn PDF document text
    • https://vudulami.weebly.com/uploads/1/3/5/9/135964857/c5349d37a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369522/normal_5feb77cb97102.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/fb0eac63-bdbc-4b52-804e-f6a14b22af37/dungeons_and_dragons_collector_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25dc2625-8aa2-459d-a5ee-6d30f0398690/96854673405.pdfIn PDF document text
    • http://pobakil.epizy.com/dell_precision_m6500_mass_storage_controller_driver_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e9e12be-1cd0-45eb-adea-269f171dec7c/harry_potter_and_the_half-blood_prince_cast.pdfIn PDF document text
    • http://mizixizomafupez.epizy.com/18585981658.pdfIn PDF document text
    • http://jevazebi.epizy.com/83017596689.pdfIn PDF document text
    • http://wiwazisumi.rf.gd/adj_clause.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ae2693c-2605-4fd2-9540-510cb24156aa/nodabigi.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_off0000f65f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65F 5860 bytes
SHA-256: 5f6ab5d27d7aa33fc83c4daa2c3394910d19168430ae2e8fcd88cb244b94de54
font_01_sfnt_off00010a2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2B 10708 bytes
SHA-256: dab4e0871d850ac9ca174fee176ca71a06a465436188a7be68c84cb77d681c9e

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