Malicious PDF — malware analysis report

Static analysis result for SHA-256 0956462e8f32532a…

MALICIOUS

PDF

70.4 KB Created: 2021-03-20 20:43:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 9b5427967db7f7d02b4921eac75c6403 SHA-1: b2edeffc99bd659ec00e414f0f5ef2c27d8a8d28 SHA-256: 0956462e8f32532a88763156e5e3e1a01d5a6052538051d30eddcf384d2334c1
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable domains, which is characteristic of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO manipulation or to distribute further malware. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful content.

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 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://resalured.ru/strik?utm_term=marketing+an+introduction+13th+edition+pdf+reddit PDF link annotation
    • https://tinubuwetoka.weebly.com/uploads/1/3/5/3/135325034/kelemupuxaw.pdfIn PDF document text
    • https://cdn.sqhk.co/kupujape/iehfksQ/dragon_ball_z_mod_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380692/normal_6054493966844.pdfIn PDF document text
    • https://cdn.sqhk.co/gixixutiji/hihibia/tripadvisor_best_travel_guide_book_for_barcelona.pdfIn PDF document text
    • https://fewefemuge.weebly.com/uploads/1/3/4/3/134372507/b44a9d3aa87.pdfIn PDF document text
    • https://cdn.sqhk.co/takodabu/ijmhija/nickelodeon_basketball_stars_crazy_games.pdfIn PDF document text
    • https://wudajelenap.weebly.com/uploads/1/3/4/4/134470879/8481af0a.pdfIn PDF document text
    • https://cdn.sqhk.co/bikulatitaxe/dgcdoji/baseball_card_collection_for_sale.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428054/normal_6023d3175e426.pdfIn PDF document text
    • https://sivisobimiji.weebly.com/uploads/1/3/4/7/134754783/belupane.pdfIn PDF document text
    • https://ponozivodu.weebly.com/uploads/1/3/0/7/130775347/9313420.pdfIn PDF document text
    • https://cdn.sqhk.co/wixefawoz/gbjfXii/raid_shadow_legends_pc_and_mobile_same_account.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://98771922-91e4-4673-aa0d-7794f4435593.filesusr.com/ugd/b6aaa0_429818dc26f4450992b7e30156e54409.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3115fddc-f872-414d-9757-3a7d2508fc0d/what_does_it_mean_when_fedex_says_package_not_due_for_delivery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/687a94b8-0857-44d9-b1d8-8dee50eb6d7c/nemajumusovazajidobe.pdfIn PDF document text
    • https://083189c9-8220-4687-a375-57be19a37228.filesusr.com/ugd/909b15_e3b2e260dfb24785b5f8d9959b5da90c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/09f92cc3-439e-4b30-a454-6f92dc2ae683/beats_3_solo_wireless_price.pdfIn PDF document text
    • https://77a80da1-97a3-4b40-ba11-54c6d232eb66.filesusr.com/ugd/39a0fd_774afa497531452fbb2239bb5d6a0edf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e44ab9c-28e4-47c2-a956-0f65e22db773/who_makes_mtd_mower_engines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d44f47e-12da-4d49-910a-673ef26cc77d/woduvesoginujapedugiwowas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33091998-4b4a-444d-9165-a6578607409f/best_business_analytics_colleges_in_usa.pdfIn PDF document text
    • https://20128683-61eb-4207-b985-d468b1a81fea.filesusr.com/ugd/0049ca_f1dd9faef02c4d41a0f83dfa59a31615.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A5 5492 bytes
SHA-256: 3be87d4c71da8125097288a6ae022454badde23b2edf01356a557b6eb6398af8
font_01_sfnt_off0000e96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96A 10112 bytes
SHA-256: 21d4466ef1482a0c2b908cce0732a0cbb08e0686c6056ebf03b14fda081b97db