Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e6846765d0a0765…

MALICIOUS

PDF

84.4 KB Created: 2021-04-05 02:10:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 244f11538c6937d2325080514d8d2648 SHA-1: b0a7e98b77e26a4d304123781d4e29e6ea48539a SHA-256: 4e6846765d0a0765012938a81a5f08c50de4ab4d42a376e405f90324a3166a5f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The presence of a PDF_SEO_LINK_FARM heuristic firing and the ML_NYX_PDF_MALICIOUS score strongly indicate malicious intent. While no scripts were directly extracted, the structure and URL distribution are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jumiwimov.ru/123?utm_term=chiari+2+malformation+prognosis PDF link annotation
    • http://zijixiteluwek.scienceontheweb.net/list_of_mass_moment_of_inertia.pdfIn PDF document text
    • http://zovitidagawas.sportsontheweb.net/kemanonenemixok.pdfIn PDF document text
    • http://xitodefigatefuj.medianewsonline.com/arihant_banking_awareness_book.pdfIn PDF document text
    • http://kegetisa.mygamesonline.org/1000_words_english_to_arabic.pdfIn PDF document text
    • http://vefatata.22web.org/ejercicios_de_enlaces_ionicos_y_covalentes_resueltos.pdfIn PDF document text
    • https://vigekajabaka.weebly.com/uploads/1/3/4/7/134708837/sefilo-ritezunitiji-xajokobole-jiwisosodujule.pdfIn PDF document text
    • http://fesofiwig.22web.org/79198252121.pdfIn PDF document text
    • http://tezijexipilimo.getenjoyment.net/comparing_absolute_value_worksheets.pdfIn PDF document text
    • http://retapadu.medianewsonline.com/contabilidad_de_costos_peru.pdfIn PDF document text
    • http://lowabunuzoxa.getenjoyment.net/mitebi.pdfIn PDF document text
    • http://fudoviwil.mywebcommunity.org/xekokeniwavevigaxizuv.pdfIn PDF document text
    • http://munasimowijuxi.getenjoyment.net/oxford_picture_dictionary_second_edition.pdfIn PDF document text
    • https://mapevitesofik.weebly.com/uploads/1/3/1/6/131606073/1945571.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9b08d158-0e0f-4203-9b31-e1272d977b1c.filesusr.com/ugd/086daf_7c968e66f32746c3bcb77198e2bcebff.pdf?index=trueIn PDF document text
    • https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_b8110810b44e4aa185ea24dca6f265c0.pdf?index=trueIn PDF document text
    • http://tevefetilojas.atwebpages.com/puwoxile.pdfIn PDF document text
    • http://kozogasivufi.myartsonline.com/18404075142.pdfIn PDF document text
    • https://ec8c99fd-5413-4e38-b6a0-2ccbba71fc6f.filesusr.com/ugd/de02f3_cce96dbdeea8414796c8133fbfb47a82.pdf?index=trueIn PDF document text
    • https://b2bd4247-5771-4f9a-9f3f-b46500bff287.filesusr.com/ugd/f41bfe_a949fb60ea7045469493278eccc10e57.pdf?index=trueIn PDF document text
    • http://xenezipulugiji.atwebpages.com/ruzavabejibipolofupos.pdfIn PDF document text
    • http://karifopiti.epizy.com/98389234177.pdfIn PDF document text
    • https://77bc4ea4-de20-41c0-a463-a5315db628d9.filesusr.com/ugd/2c69e3_1257ff1343554e88a184b7e629b71998.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f63a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63A 5352 bytes
SHA-256: e1a129282d307816d9edd012587aca25ec46ad4638aa0d2b8ba1b0f41bc834fc
font_01_sfnt_off00010845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10845 11672 bytes
SHA-256: b1c4cf268c8dd1be872496ef49d7be99f34edf5ff40cf415f47a0056db87a838
font_02_sfnt_off00012e92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E92 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15