Malicious PDF — malware analysis report

Static analysis result for SHA-256 a473b6072d54f1ff…

MALICIOUS

PDF

76.9 KB Created: 2021-06-01 00:11:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a3eb4000e63539615366b7396f7261f9 SHA-1: 545031386bd267dc1a0ceb31ae4981898f6eba7c SHA-256: a473b6072d54f1ffc41c065aa9550879a357ab66029dcccdb3af9e990338fd76
226 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users. The presence of a 'Password-protected archive handoff' heuristic indicates that the document may be a lure to obtain credentials or to trick users into downloading a password-protected malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://leonvi.ru/123?utm_term=adobe+acrobat+8+professional+software PDF link annotation
    • https://navowilupaxit.weebly.com/uploads/1/3/1/3/131381067/regujavavu.pdfIn PDF document text
    • https://dofuzubakav.weebly.com/uploads/1/3/1/6/131606612/577182.pdfIn PDF document text
    • https://wotipivas.weebly.com/uploads/1/3/1/4/131482993/zidorasevuduwez.pdfIn PDF document text
    • https://xeromikivato.weebly.com/uploads/1/3/2/6/132695960/4180319.pdfIn PDF document text
    • https://luzenage.weebly.com/uploads/1/3/4/3/134317967/693a238.pdfIn PDF document text
    • https://zuxibonidape.weebly.com/uploads/1/3/4/8/134889984/fubaronofuwar.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/3a5f235e-ca0f-496e-a151-d2102da1519f/the_hunger_games_2012_full_movie_free_download_in_tamil.pdfIn PDF document text
    • http://didaneguk.pbworks.com/w/file/fetch/144428304/descargar_five_nights_at_freddys_3_full_apk.pdfIn PDF document text
    • http://mudowomuxexo.pbworks.com/f/af_sosyal_bilimlerde_aratrma_yntemleri_ders_notlar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07bee88b-c84d-4c49-87c2-ca961930e34c/zuxarufiroxamoxokodiveni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17aae1e5-ed37-4d0a-aaef-4b121e295143/el_arte_de_amar_pelcula_polaca.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c27ef20c-e779-48ab-b974-03dd1afca661/vomixezojun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad0d0583-e9f9-4529-91ce-73f8d816af0d/glenfield_model_60_scope_base.pdfIn PDF document text
    • http://gulisapil.pbworks.com/f/tekken_5_psp_romsmania_usa.pdfIn PDF document text
    • http://nagomax.pbworks.com/w/file/fetch/144425220/98045214747.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e53bbb0-f4f0-403e-ac9c-9e84f4af5a8c/how_to_pair_a_plantronics_5200.pdfIn PDF document text
    • http://togusan.pbworks.com/f/cathodic_protection_system.pdfIn PDF document text
    • http://funinupun.pbworks.com/w/file/fetch/144425319/92382146525.pdfIn PDF document text
    • http://xuruzinijub.pbworks.com/w/file/fetch/144428244/sotixajesuwunogep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39b3c167-dd04-4795-b62d-9567d8b68168/luzonurane.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_off0000e8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DA 5564 bytes
SHA-256: e6bbe10e56fc398c188002696f29751363acfbef9209377c790fc27d8f6d56f4
font_01_sfnt_off0000fbe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE5 12636 bytes
SHA-256: f2c01052f513f1b007ee431291c724a830befc6e65571e9f3e5fb2a196d1818a