Malicious PDF — malware analysis report

Static analysis result for SHA-256 82c0d83ac7936a87…

MALICIOUS

PDF

75.7 KB Created: 2021-05-18 16:11:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 9f55234a4a5af0997725af92a04237d1 SHA-1: 4c923785cc3b408bc93ce854080a0880ac0ab4fe SHA-256: 82c0d83ac7936a87ae602464f116cd66b70c7ade6169d695e5dc287145ead093
126 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 of which are hosted on disposable domains, suggesting a link farm or SEO spam operation. The primary URL, 'https://gimoguvi.ru/strik?utm_term=spoken+english+lessons+for+beginners+pdf', is presented as a resource for English lessons, likely as a lure. The ML classifier strongly indicated maliciousness, and the structure points towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://gimoguvi.ru/strik?utm_term=spoken+english+lessons+for+beginners+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368758/normal_600ac92f7c3df.pdfIn PDF document text
    • https://dogulusowugol.weebly.com/uploads/1/3/4/4/134493498/natazex.pdfIn PDF document text
    • http://wetekekazovuzo.22web.org/fikigele.pdfIn PDF document text
    • https://beluxavin.weebly.com/uploads/1/3/4/5/134507718/kexugafes-mululaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489844/normal_605ffab33435d.pdfIn PDF document text
    • http://xapepinozex.22web.org/pijewi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368266/normal_5fda6c874493e.pdfIn PDF document text
    • https://vebeviwikime.weebly.com/uploads/1/3/4/3/134317270/d3a3ac3.pdfIn PDF document text
    • https://dewixazupeteti.weebly.com/uploads/1/3/1/4/131455636/garigirab-fuzibi.pdfIn PDF document text
    • https://fasepilof.weebly.com/uploads/1/3/1/1/131163931/bibewiwebezibu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://famojubosaved.rf.gd/dieta_brat_espanol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c486f4fe-1a28-4429-8753-4d0cb5df0d35/4_pic_1_word_6_letters_level_2240.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dd38411-a00e-45c0-8676-20cb8253d33a/how_to_use_google_maps_on_iphone_while_driving.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab3aff7d-0521-4106-921a-e41f36ef4fb5/maroo_of_the_winter_caves_book.pdfIn PDF document text
    • http://vilipenizubawub.rf.gd/rubexivizowoxusavofipul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e157fcc-2459-4edc-958d-6c77b7cd0782/sifususefus.pdfIn PDF document text
    • http://sanubexudo.rf.gd/fixugifewiramijife.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b03c00ba-8efb-43ac-b36d-b9a715de906d/juvikisojeku.pdfIn PDF document text
    • http://xodijofo.epizy.com/amar_ujala_epaper_deoria.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_off0000e98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98B 5400 bytes
SHA-256: f735d0baaeae8b75e552c4d811ffa282becd8e1ac17244bd2d31f4a567954004
font_01_sfnt_off0000fbe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE3 10816 bytes
SHA-256: 9faf1e911d1b0dc31d389ed03744dd04e8998d1bf731bd9746fe42b557072544

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