Malicious PDF — malware analysis report

Static analysis result for SHA-256 17fe6051f5c64333…

MALICIOUS

PDF

76.6 KB Created: 2021-03-06 03:16:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: aa59cf37eddef341cfbde9dd8f99c288 SHA-1: a52a3e509c5371fb8ae1ac229bed9ce025dc943f SHA-256: 17fe6051f5c6433336d1cd800348967c2e5e32bbf46f31cafdca683c2e712cbb
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 0.9996

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://jottigo.ru/strik?utm_term=cronica+de+una+muerte+anunciada+novela+completa+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4466675/normal_600a90b140c63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369332/normal_602512e70ffc1.pdfIn PDF document text
    • https://pegepigav.weebly.com/uploads/1/3/4/4/134481067/gazelurokumelu.pdfIn PDF document text
    • https://fugesozuxi.weebly.com/uploads/1/3/0/7/130739141/bewunala.pdfIn PDF document text
    • https://zebatezovas.weebly.com/uploads/1/3/4/6/134618099/949121.pdfIn PDF document text
    • https://gewasulupav.weebly.com/uploads/1/3/0/7/130740056/5f7b7b0642.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453907/normal_6014918401b99.pdfIn PDF document text
    • https://tivepikilusu.weebly.com/uploads/1/3/4/7/134759048/fimepagokeduxuw_dimogizewa_tajewa.pdfIn PDF document text
    • http://gamukanemafutu.mywebcommunity.org/how_does_migration_and_cultural_diffusion_work_together.pdfIn PDF document text
    • http://veruvipavopa.getenjoyment.net/wexusewipibamaxiv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482405/normal_5fee451dd07c8.pdfIn PDF document text
    • https://molefagis.weebly.com/uploads/1/3/5/3/135311004/zelomemaji_vigolevipiwalim_midezu.pdfIn PDF document text
    • https://dobopekajami.weebly.com/uploads/1/3/4/3/134314215/pimawivukedoxuwinub.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/68c4f3e7-62cf-4367-816a-986b59713773/how_to_program_directv_universal_remote_codes.pdfIn PDF document text
    • http://peledopa.myartsonline.com/digitech_vocalist_live_fx_power_supply.pdfIn PDF document text
    • http://sujunutab.atwebpages.com/15701481695.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46fa0d9f-0635-4889-a3a2-e6fee62d9781/toro_personal_pace_mower_drive_cable.pdfIn PDF document text
    • http://perexuwofogefo.onlinewebshop.net/zesozabonebimibe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a6ebfb1-38ae-4aa0-9776-5de779c519e8/brown_vs_board_of_education_and_the_civil_rights_movement_klarman.pdfIn PDF document text
    • https://77483064-5892-4b52-b419-66e751946b77.filesusr.com/ugd/ef7b09_23ebe0998bd8426890d812f73b220683.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a83c9d7-c98d-4ad1-b214-ec95fa1f1c89/types_of_seminars.pdfIn PDF document text
    • https://1a447ccf-a6a5-490c-ad31-399ae8169532.filesusr.com/ugd/cf5184_5a1784d1dd114dd99a1c254202bb9e5c.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD9 5088 bytes
SHA-256: af2d9caab9abf7947dea605a39d70f4e300d69d9d86624325700436d746f7f75
font_01_sfnt_off0000fd14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD14 11768 bytes
SHA-256: c8c3741674a9b8637c9bd65301711afdb42f51cda524fda7e58ccb95b9ea2c23