Malicious PDF — malware analysis report

Static analysis result for SHA-256 21d443ee799443f1…

MALICIOUS

PDF

78.2 KB Created: 2021-03-22 10:25:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: f8c52263b0980a1b82712476915335b3 SHA-1: b10ab353db77c462f9737a79331025498ecff480 SHA-256: 21d443ee799443f1026edc2faaccc455d70016253a0ce065a7513cd34aabcc5e
186 Risk Score

Malware Insights

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

This PDF document functions as a link farm, containing numerous external URLs that lead to other PDF files. The primary purpose appears to be directing users to potentially malicious content or phishing sites, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://seumenha.ru/award?keyword=the+haunting+of+hill+house+book+pdf PDF link annotation
    • https://xevibobi.weebly.com/uploads/1/3/4/6/134683071/kebekam.pdfIn PDF document text
    • https://cdn.sqhk.co/wekaradukuve/hxNhfgh/warezovutib.pdfIn PDF document text
    • http://kimisorunutom.medianewsonline.com/cable_tray.pdfIn PDF document text
    • https://gawenowufiwozup.weebly.com/uploads/1/3/1/3/131383543/9846589.pdfIn PDF document text
    • http://sowoxapexemex.sportsontheweb.net/infrared_absorption_spectroscopy.pdfIn PDF document text
    • https://vadiduriku.weebly.com/uploads/1/3/4/4/134445950/d6611e7fbcecf07.pdfIn PDF document text
    • https://cdn.sqhk.co/tovipovo/jcx6jeB/29_april_asteroid_2020_live_location.pdfIn PDF document text
    • https://cdn.sqhk.co/nokikijun/8nJ2xib/pirates_of_caribbean_2017.pdfIn PDF document text
    • http://itsamorem.com/dicionrio_de_rimas8934x.pdfIn PDF document text
    • http://tufodudem.mypressonline.com/devojirelezes.pdfIn PDF document text
    • http://harmony-market.ru/xofitugojutu881v7.pdfIn PDF document text
    • http://tatemegedes.sportsontheweb.net/zevuwigolit.pdfIn PDF document text
    • https://cdn.sqhk.co/xakatikakizi/0jf01id/snapped_killer_couples_season_6_episode_3.pdfIn PDF document text
    • http://profapp.pro/how_much_do_google_certifications_cost9dsdi.pdfIn PDF document text
    • http://vertitribe.store/domuxegbxpi.pdfIn PDF document text
    • http://7gusevshop.website/713794345255zscx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://ed36ca5d-e6e9-4caf-8bbb-3a8af5cfee16.filesusr.com/ugd/971556_e50bac01d20340ffae1cdecf8629af66.pdf?index=trueIn PDF document text
    • https://538d8494-0c7d-401a-b890-0485f6bc7bca.filesusr.com/ugd/29c71c_5e9e30e52e6949d094ef889dbc7348ff.pdf?index=trueIn PDF document text
    • https://d1ee23ee-9ccf-45b0-80ef-1e1ff1f657c4.filesusr.com/ugd/9ef0c3_04452bb9e3f347138ffab6e8c557770c.pdf?index=trueIn PDF document text
    • http://kepagewav.atwebpages.com/gonidabukeriredom.pdfIn PDF document text
    • https://972af30b-04c2-4618-b911-83ba0b7fef9e.filesusr.com/ugd/84a5c6_24b058e2b8734e5e91ec5ff7c6910b57.pdf?index=trueIn PDF document text
    • https://855e1e5b-0daf-4dce-aa73-dfad2bfec5df.filesusr.com/ugd/ced2dc_583fd84b5c364520b45d1dee5caea57e.pdf?index=trueIn PDF document text
    • https://907864b8-ab38-4b43-b195-7646ee37c451.filesusr.com/ugd/c4b402_24a13488660e44d8bebb2f4e2ddca2cd.pdf?index=trueIn PDF document text
    • https://d6504552-49b0-4b7d-b1ff-94f9e1082b83.filesusr.com/ugd/1f0558_39ba069853ed4c718ef2b222f4c11678.pdf?index=trueIn 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_off0000e610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE610 5240 bytes
SHA-256: 2b61cd546fb468d7b09a782ff1cc98e4d09d97a29a50d1c30a8e7299ff6616b5
font_01_sfnt_off0000f7de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DE 10928 bytes
SHA-256: 4d125d5cb24c7f1c4f608a0abd804961fa49a361ce9cc91fb6d1a856b40d5a74
font_02_sfnt_off00011ccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCB 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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