Malicious PDF — malware analysis report

Static analysis result for SHA-256 5813f0c350475650…

MALICIOUS

PDF

104.9 KB Created: 2021-03-12 13:00:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: cf8a8ff56207581807a6760b5cb81162 SHA-1: bbbedbaf0957cad2356eac1dcc61d35b039ce5d4 SHA-256: 5813f0c35047565087f9968c4c4dbd5e7fe1677045c42df4f271065b8f90c9b9
126 Risk Score

Malware Insights

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

The PDF contains embedded URLs pointing to suspicious domains, including one that is part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially malicious content, likely a phishing page or a download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

Heuristics 5

  • 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 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://xezojetit.ru/award?keyword=chain+rule+derivative+pdf PDF link annotation
    • http://makudejolas.iblogger.org/subuwikabavopajulat.pdfIn PDF document text
    • https://cdn.sqhk.co/xodakebebit/5ibCkje/42273556349.pdfIn PDF document text
    • https://kodanefonilulev.weebly.com/uploads/1/3/4/7/134702772/tenazipuz.pdfIn PDF document text
    • https://girusidopot.weebly.com/uploads/1/3/0/7/130738876/paxezidovaxidube.pdfIn PDF document text
    • https://nojezedefefowas.weebly.com/uploads/1/3/4/7/134762002/b0ae409.pdfIn PDF document text
    • http://poposiruta.mywebcommunity.org/40334292975.pdfIn PDF document text
    • http://vefefex.iblogger.org/perfil_de_los_5_lenguajes_del_amor_test.pdfIn PDF document text
    • http://pewekelexu.mygamesonline.org/cozi_tv_schedule_tonight.pdfIn PDF document text
    • https://cdn.sqhk.co/lapefuxolu/WjeoOjS/26406825782.pdfIn PDF document text
    • https://sokuvotaboraj.weebly.com/uploads/1/3/0/7/130776263/gazetewokopi_tataxonilokowut.pdfIn PDF document text
    • http://toworugesolur.getenjoyment.net/best_cfop_algorithms.pdfIn PDF document text
    • https://cdn.sqhk.co/poronujefino/chl1jSn/brothers_a_tale_of_two_sons_missable_achievements.pdfIn PDF document text
    • https://nanupubixo.weebly.com/uploads/1/3/0/9/130969545/vawesat-bisowuv-xazikoxopanigu-zufilolef.pdfIn PDF document text
    • https://cdn.sqhk.co/nugubirudif/dgcEbpO/70723844858.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/aefcca6a-8a3c-4aa2-a5df-44debfdb393a/tuputiwidexesadafumimetu.pdfIn PDF document text
    • https://492f55f4-3442-4b37-b17e-39d9f2f0ae8a.filesusr.com/ugd/7dfe85_792fa48adee841b8bcadc2c12db35e73.pdf?index=trueIn PDF document text
    • http://xuvafojufiwel.epizy.com/systems_engineering_and_analysis_5th_edition_solutions_manual.pdfIn PDF document text
    • http://meletediso.rf.gd/muredewowedabuw.pdfIn PDF document text
    • http://biwosagamivi.myartsonline.com/42683476065.pdfIn PDF document text
    • http://fekerudosepu.rf.gd/bollywood_hd_movies_300mb_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f5bfeb6-ccc6-4af3-b0f3-7ab3101f9a43/what_properties_does_table_salt_have.pdfIn PDF document text
    • https://6e229dea-1f83-4be8-8cd3-388eabd4f5e3.filesusr.com/ugd/1cfe37_54b871b164ba4f1c92d7ea7ad25aa0d0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/907253da-3442-48ee-873f-24d23a2d5ca9/luxigutedof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c77bff90-1807-480e-81f1-cc4db98af6f1/23761347402.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb8b6f69-4baf-4b23-b1a9-8f1cdf5ae2bc/90114675484.pdfIn PDF document text
    • http://zisukuvi.atwebpages.com/bertolt_brecht_das_leben_des_galilei.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
    • 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_off00013afa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AFA 4916 bytes
SHA-256: d03ca3d8aecafe91ff42a97a0ceb6dfb64ae7c9afc8689b3ee4ce1ac6b4f84fb
font_01_sfnt_off00014bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BB3 16600 bytes
SHA-256: f0d806df726e296b317003286ea17a71cead1795529867e984a2356fc1e5f484
font_02_sfnt_off00017fe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FE0 16288 bytes
SHA-256: 6317c7a7beb00fe130258ecd608f18e51e672d849c61ea40a9f04ea17ecb3703