Malicious PDF — malware analysis report

Static analysis result for SHA-256 e56c2807b6b5ef76…

MALICIOUS

PDF

79.6 KB Created: 2021-05-16 03:02:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b618719de54571825868786a760b50c0 SHA-1: ea3a702e60fdaf9144a6689e0aa62ce9a51c0faf SHA-256: e56c2807b6b5ef76e663f85f59674fb5dd4055b1d13b65ead3a366effe1c13ac
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be related to educational worksheets, likely serving as a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://kuzutuzo.ru/strik?utm_term=multiplying+and+dividing+integers+word+problems+worksheet+with+answer+key PDF link annotation
    • https://wosowabo.weebly.com/uploads/1/3/4/3/134340570/4879596.pdfIn PDF document text
    • https://mubazujozij.weebly.com/uploads/1/3/4/7/134705676/7929d542710bfc5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455902/normal_6046299380ffd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470977/normal_60258d63f01c6.pdfIn PDF document text
    • https://giminabev.weebly.com/uploads/1/3/4/6/134601645/5790108.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484097/normal_601fe187e2ea1.pdfIn PDF document text
    • http://kekewawoxugar.sportsontheweb.net/books_download_online.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366377/normal_5ff948d688307.pdfIn PDF document text
    • http://gomuleg.22web.org/free_android_backup_whatsapp_to_pc.pdfIn PDF document text
    • http://metagopu.22web.org/add_png_to_python.pdfIn PDF document text
    • http://wifejopoxakobo.iblogger.org/food_and_beverage_service_images.pdfIn PDF document text
    • http://vobalemujumojak.mywebcommunity.org/nigerian_worship_songs_lyrics.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393485/normal_60325126304e0.pdfIn PDF document text
    • https://tafakonedazi.weebly.com/uploads/1/3/4/8/134896847/zogavegu-zejapi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jujobope.atwebpages.com/column_addition_and_subtraction_worksheets_year_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d88633d-5e51-4781-8582-1493a8bdb3b5/change_management_theory.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e56b2a7-af84-4f1a-a1a3-44f0a2f7b8fa/46807796156.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e1ddddf-39ab-4df3-aafb-c8f6d1e2104f/73679485187.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/512f6b9c-1295-47bd-93fd-cccc807f9551/john_deere_x360_issues.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30f4e0b3-cf89-4210-af74-9fb960d393d8/33165739594.pdfIn PDF document text
    • http://kepofif.onlinewebshop.net/how_to_read_23andme_results.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a46af7d-3973-488e-9fbf-cc23c1fc0a3e/63963568161.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d079ce0-8aea-44b1-9a00-ca6c32f8eb1e/samsung_smt_h3362_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bafcdc2f-16c9-44fd-b683-452783bdd7a2/1103819749.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c47a0a7a-3368-4ef5-88b6-14c5863ca0b4/xusozakojububupape.pdfIn PDF document text
    • http://xewajube.epizy.com/getowetebukiguluwofeku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dccea8e7-df5e-4d2c-b231-43a62ae08575/89774969378.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72D 5836 bytes
SHA-256: 31b6a654b16b68d773bd02018793fc5f8947176734967044aab6106c47b63e47
font_01_sfnt_off0000faf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF7 2536 bytes
SHA-256: f6b1df63fe37622969e2da94fc84033336617f2bb88ed9efb770c575f9b4880d
font_02_sfnt_off000105da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DA 11424 bytes
SHA-256: 3d8567fcd5700b7949073e20bc9d787bbf08abcbbe4447c0622b53d1951b8ba5

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