Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2bbc65d85126484…

MALICIOUS

PDF

100.9 KB Created: 2021-04-21 04:39:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c1a47f37d8027cea6a7ead5357fd0f1b SHA-1: 1192d092220bf242aebcb544626c1b112b82dde6 SHA-256: d2bbc65d85126484e27cfb11188a3d592fd901c1a78fe5b1ec25c103e37a98b8
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 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/strik?utm_term=how+many+lost+books+are+mentioned+in+the+bible+kjv PDF link annotation
    • http://znasila.ru/formulas_de_los_volumenes_de_los_cuerpos_geometricoszpbzq.pdfIn PDF document text
    • https://towuzisutodugo.weebly.com/uploads/1/3/0/9/130969847/titowemiz.pdfIn PDF document text
    • http://kasaxeko.mypressonline.com/29807387891.pdfIn PDF document text
    • https://luragelekow.weebly.com/uploads/1/3/4/3/134377287/fewax_xixiwepadoda_xadat.pdfIn PDF document text
    • http://lnstagaram-verifiedbadges-from.com/pencil_sketch_drawing_lessonsizhop.pdfIn PDF document text
    • http://rafupofamurawaf.mygamesonline.org/68120661734.pdfIn PDF document text
    • http://finipupote.mywebcommunity.org/advanced_search_engine_optimization.pdfIn PDF document text
    • http://good-production20.site/sekajezazapijozapivokovyo97o.pdfIn PDF document text
    • http://winoorama.website/10739692173wef0e.pdfIn PDF document text
    • http://epaytds.xyz/android_pay_and_apple_pay9kqrc.pdfIn PDF document text
    • https://fenotitejov.weebly.com/uploads/1/3/5/3/135316040/e81298b3.pdfIn PDF document text
    • http://pakizimavom.scienceontheweb.net/ditegosofim.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/07c8f5cf-7500-49b0-a0c5-6912feecc05f/who_played_the_part_of_voldemort_in_harry_potter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc81344a-80f7-4d8a-bfbd-1f65e3015543/jadinelosibireve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8242806-ac6a-4a77-b249-80cbc2af69e9/70302981308.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd01932f-17bb-46dc-bda4-e207e8ff436a/92742637872.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e3bfd70-f10e-4204-b75e-2f55eaaaa3ff/51633845059.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a09905a-e4e5-47fc-a7ab-12493d957e42/original_boy_scout_handbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f7619a5-01dc-480c-8554-518035dd099b/what_is_indo_islamic_architecture.pdfIn PDF document text
    • http://zerowegujij.onlinewebshop.net/63829102615.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_off00014303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14303 5560 bytes
SHA-256: 6885094ac190e4e755a482476d8a98720ca75255ec68613ae8877b279260ea12
font_01_sfnt_off000155d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155D6 14712 bytes
SHA-256: e40660561ca1d8dcfebb1c084d7b10eb075de5e41c051a6ddb29e8adbdfa7bac