Malicious PDF — malware analysis report

Static analysis result for SHA-256 4933f1136fca526a…

MALICIOUS

PDF

76.6 KB Created: 2021-03-20 15:17:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 6f7c3a44a2e581c78e6e5ddf09af9dc1 SHA-1: 550a2bbbcf285b058357c90f718ce28cd94bd4c7 SHA-256: 4933f1136fca526a10a4d235fa27b6baa1800d8de1e562af96a8129d4e8a5421
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of multiple external URIs, including one on a disposable host with UTM parameters, suggests a phishing or redirection scheme. The 'SE_URGENCY_LURE' heuristic further supports the phishing pretext, aiming to prompt immediate user action.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://nipisod.ru/aws?utm_term=worst+star+wars+books+reddit PDF link annotation
    • https://cdn.sqhk.co/benanejufa/UKgjCeH/pico_superhero_car.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501482/normal_6021aef396aca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489607/normal_6032b026030a3.pdfIn PDF document text
    • https://cdn.sqhk.co/befozaxulot/hhjL5iT/91638729269.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413573/normal_5feb201f63c31.pdfIn PDF document text
    • http://diriluma.22web.org/mebodar.pdfIn PDF document text
    • https://cdn.sqhk.co/kibutonap/jaggU5C/44996054721.pdfIn PDF document text
    • http://nupifijaw.getenjoyment.net/ruet_admission_circular_2020_20.pdfIn PDF document text
    • https://cdn.sqhk.co/sabumijobude/ajjy8ns/2p_nes_emulator_pro_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/xakelafu/Fhfhewx/three_top_up_rewards.pdfIn PDF document text
    • http://rokuboxajiga.medianewsonline.com/analytical_methods_for_lawyers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380859/normal_604d3fff7ae37.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bodazovire.epizy.com/petsafe_electric_fence_dog_collar.pdfIn PDF document text
    • http://laniferes.epizy.com/burakomimidemenewanuwepa.pdfIn PDF document text
    • http://tebalakafepikob.rf.gd/wajid_baghdadi_new_song.pdfIn PDF document text
    • http://zemorirasipiw.epizy.com/jane_eyre_oxford_bookworms.pdfIn PDF document text
    • http://fevosajiwe.rf.gd/wopejowo.pdfIn PDF document text
    • http://givemuzod.epizy.com/thymeleaf_format_date.pdfIn PDF document text
    • https://ddc7b23b-31e5-4b5c-aaad-d3b7cef26861.filesusr.com/ugd/e506b8_40798769aec040d980b68f2c47a8991a.pdf?index=trueIn PDF document text
    • https://327bbe42-9aa5-4ca0-80e5-6c9857058a26.filesusr.com/ugd/2b870b_e790f7512a354964800f696dba7184be.pdf?index=trueIn PDF document text
    • http://nudagimanefej.atwebpages.com/university_scholarship_application_letter_sample.pdfIn PDF document text
    • http://faxumev.epizy.com/tobidodidujufemu.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_off0000eead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAD 5096 bytes
SHA-256: 33bda1cb3f12a89fdc3fa2e55a6945474f1a6358b07582a22eea196c5bc28664
font_01_sfnt_off00010029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10029 10864 bytes
SHA-256: c9d21ebeb9f786fb7aec62e57eb1a043d841bfb7f1cca2183a27359b23a8032a

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