Malicious PDF — malware analysis report

Static analysis result for SHA-256 126a40e635dcd1ac…

MALICIOUS

PDF

78.8 KB Created: 2021-03-23 22:01:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: e3ec2a71a74758f09c0a5ac51e674804 SHA-1: fa0ee680f5e95d339ce5a40dd6df967d9d22c910 SHA-256: 126a40e635dcd1ace713b28b645a73335468dc7044eff4d8729f8c3ce642baed
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document contains heuristics indicating it is a link farm and a browser installation lure, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. The presence of external URIs, including one pointing to 'vilenefex.ru', further supports the malicious intent, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?utm_term=uc+browser+for+pc+terbaru+2018 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368481/normal_5fdc1b254ee9c.pdfIn PDF document text
    • https://cdn.sqhk.co/wofikubid/jjdyjdc/31633041787.pdfIn PDF document text
    • http://xuzobinemipivor.mygamesonline.org/what_is_a_rain_crow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366029/normal_604b03693ec7c.pdfIn PDF document text
    • http://napufokotipo.getenjoyment.net/aitsl_professional_standards_for_teachers.pdfIn PDF document text
    • http://zexitekaxob.mypressonline.com/35510403074.pdfIn PDF document text
    • https://cdn.sqhk.co/mikevoponage/caCggjc/center_of_gravity_chemistry_definition.pdfIn PDF document text
    • https://cdn.sqhk.co/nifijagik/higgHja/variance_of_uniform_distribution_proof.pdfIn PDF document text
    • https://cdn.sqhk.co/nexifatogex/NjhLpOv/7756518823.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476590/normal_601484d920ef6.pdfIn PDF document text
    • https://cdn.sqhk.co/tibakekavero/tZiheha/silver_dollar_city_new_map.pdfIn PDF document text
    • https://cdn.sqhk.co/teketerep/b6ghBbn/wemiveporobuwuwa.pdfIn PDF document text
    • https://cdn.sqhk.co/tuwetebep/ia2b5gh/luvomufa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/voxazedisula/zunagovilinetavewuned.pdfIn PDF document text
    • http://muxolisakij.epizy.com/burnaware_free_bg.pdfIn PDF document text
    • http://fazafowunop.epizy.com/katamuxo.pdfIn PDF document text
    • https://s3.amazonaws.com/xelimewat/vocabulary_workshop_level_d_unit_4-6_review_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/pulavokaxe/noxolavelaxebufefaxupiz.pdfIn PDF document text
    • http://wotisonuli.epizy.com/crazy_frog_theme_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/game_of_thrones_season_8_episode_1_download_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/anti_lock_braking_system_seminar_report.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_off0000f62e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62E 5720 bytes
SHA-256: 01c261ec160a5d99a568ee77f4432b52d46490739b603d3654a1031495c5873e
font_01_sfnt_off000109ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CE 10636 bytes
SHA-256: b892fc29fc96e28c08fff83eee0ce3b12581fc5f91f572a025f96ffeb34d4215

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