Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fe914e2e99be7d5…

MALICIOUS

PDF

87.0 KB Created: 2021-05-08 13:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 7b5aab73c11a8e8dfbed6162ac26c73e SHA-1: ecb306bf748d78bbaad670880d005a2f6e537bc9 SHA-256: 4fe914e2e99be7d5d700db0b58392ce02436d023cf60827f51350d65daee486f
186 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the PDF structure strongly suggest an attempt to trick users into visiting malicious sites, potentially leading to further compromise.

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://zajinet.ru/strik?utm_term=how+big+is+a+football+field+in+meters PDF link annotation
    • https://cdn.sqhk.co/limizolaxa/c3ihijg/you_freeze_pumpkin_pie_filling.pdfIn PDF document text
    • https://cdn.sqhk.co/foseziwate/jc8heDJ/assembly_line_worker_job_description.pdfIn PDF document text
    • http://dotixomovi.sportsontheweb.net/65800006436.pdfIn PDF document text
    • https://cdn.sqhk.co/kawabewiwof/bWQgKYM/limoxodagubuvigose.pdfIn PDF document text
    • http://wojisub.mypressonline.com/lg_tablet_stuck_on_verizon_screen.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/8d1b0144-9211-40c7-a3cd-6407dbc839a7/used_car_safety_inspection_checklist.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1773fbb8-4656-4f0f-9f78-f4df1a23e70e/nofagajedekaraginagunejo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fbea69c-fc0d-447f-a98f-024a5f14388b/70-411_dumps_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e0f44b8-8c43-4a8f-90b1-7eafbb816819/best_whittling_starter_kit.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/8_manualidades_faciles_para_halloween.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49f4a6d2-7ac6-456d-987f-dbf97d8ce74b/zejedokamudofedoziluset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e115b3f-2ae6-4e03-9500-e335bc108f50/19853174478.pdfIn PDF document text
    • https://43a2ba88-5de9-465b-b95f-6a4d82f2d06e.filesusr.com/ugd/dcbeda_f35e6685ad0846cba47e973e351e8867.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6ae6560-90a2-4198-b8d7-51802600ae05/fatajoxoxu.pdfIn PDF document text
    • https://ad858f6a-7bbb-416d-9365-e04d7986ed9b.filesusr.com/ugd/3c9ac1_95415c7d8c494449a4de1c21ecdac2c9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdd4f68c-3a79-4747-867b-062d75680cba/tanoni.pdfIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/wijezawi.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/tokexex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edf8112d-4a97-43ff-a525-5ee9a8afce0e/xosijid.pdfIn PDF document text
    • https://00eaa6b3-f026-4720-b00f-fafb40066352.filesusr.com/ugd/d498be_a6d600ce33bf40a1973e0d34eb5352d7.pdf?index=trueIn PDF document text
    • https://d62ff7d9-aefc-4ab8-8cdf-af38868aea16.filesusr.com/ugd/54b9a1_b68e37b04bfd466bbca9a05aaaeff8ca.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/298e13aa-1eeb-453b-8e5c-55a3b5d3aedc/neoliberalism_and_the_end_of_liberal_democracy_wendy_brown_summary.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_off000115e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E2 5420 bytes
SHA-256: 912fc8a225729a70ab7407ecaa7287ad21fefc970a6791171378723c3cf92c83
font_01_sfnt_off00012851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12851 11208 bytes
SHA-256: 0f21ceebe4e6d5be5a9f66c2b8260dd563467878dc1ae66b226545f47d777ee5