Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d3077eeda8d00a2…

MALICIOUS

PDF

136.2 KB Created: 2021-03-21 00:56:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 35aea62fbf205a1715f814d901157c8c SHA-1: 579280e0d780bd11f6e6f8357635a1472c9a620f SHA-256: 1d3077eeda8d00a262c392d7878742929b7865c78c300e15f3b66bcad869957e
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://vilenefex.ru/wix?keyword=woodmore+local+schools PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475854/normal_602ebb730684c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413244/normal_602bf1181af85.pdfIn PDF document text
    • https://rapovadok.weebly.com/uploads/1/3/4/7/134705404/pagibexiso-mumoj.pdfIn PDF document text
    • http://wonder-ita.fun/hidden_valley_road_galvin_familyi15vt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451028/normal_5ffbd3f85ea1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408464/normal_5fe83fd272b05.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366364/normal_5ff650a2bd3f1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466143/normal_6001c80baaaa9.pdfIn PDF document text
    • https://nanufuso.weebly.com/uploads/1/3/4/4/134443711/1270254.pdfIn PDF document text
    • http://gufutaca6.xyz/aprendizajes_clave_ingles9lqvl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500674/normal_60550767dc6ce.pdfIn PDF document text
    • https://zadobixif.weebly.com/uploads/1/3/1/4/131437920/10665c4.pdfIn PDF document text
    • https://lefedatit.weebly.com/uploads/1/3/0/7/130776734/9277420.pdfIn PDF document text
    • http://reduslim-siteofficial.site/sony_bravia_tv_remote_app_for_androidemrad.pdfIn PDF document text
    • http://zixudivibudizu.scienceontheweb.net/bowtie_analysis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369768/normal_5fec9016dc518.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378171/normal_6032c543b9f81.pdfIn PDF document text
    • http://dobuwiwitevotir.sportsontheweb.net/a_level_physics_dynamics.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4eb3a9b5-ca6a-4b2a-896e-878abc754f3b.filesusr.com/ugd/f1ab86_8be4a1c468114706aa79d0538e77db8b.pdf?index=trueIn PDF document text
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_67104b9de1a94e8d9b3077605552d3e8.pdf?index=trueIn PDF document text
    • http://mijovutotukedes.onlinewebshop.net/download_conexant_high_definition_audio_driver_windows_7_64_bit.pdfIn PDF document text
    • http://paguxesij.myartsonline.com/benim_hocam_tarih_konu_anlatm_kitab.pdfIn PDF document text
    • https://6c9aa500-f8d9-42a6-b8a4-5b3c562bbfc3.filesusr.com/ugd/543886_c3052bd82d404604a0f572f1a3b4240d.pdf?index=trueIn PDF document text
    • https://0ecef3a8-5193-4df1-8dcb-1b7dd0f2be2a.filesusr.com/ugd/e6092c_0d5093bc7b5043a0a344073898693581.pdf?index=trueIn PDF document text
    • https://39dd5e1d-a581-41ec-a80f-9e19245c660f.filesusr.com/ugd/c2656d_895b9e9540344feb8277440c712cd42d.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10912 68932 bytes
SHA-256: eeba6d17187ce67966b243e1689b916678fd46ceac5643d263554497f330428d
font_01_sfnt_off0001d714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D714 5192 bytes
SHA-256: 371efce9c379fe63e570e82117fa784ceaaf8ceb998882684569fbd2500b07d2
font_02_sfnt_off0001e896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E896 12024 bytes
SHA-256: c5ca761cfe271f1fd536450341878285e5f85df2e9a1ac7a4cd6c67af04634f7