Malicious PDF — malware analysis report

Static analysis result for SHA-256 99ba9de4e564e59c…

MALICIOUS

PDF

89.6 KB Created: 2021-06-02 22:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a69be66707b10ac758f3931027b6951b SHA-1: 8386d49a89bd1c766a1cce2ca5e95a21f696a016 SHA-256: 99ba9de4e564e59c5a4849c34d7e5acdeb4b0cba5f63568d7fe58b07674c2a57
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 0.9993

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://jacksth.ru/123?utm_term=free+event+html5+template PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4465403/normal_5feb9f22cbd08.pdfIn PDF document text
    • https://fepunasavejupab.weebly.com/uploads/1/3/1/3/131381111/gatolitixodo-jetubopojugexa-kibudozojelo-tulup.pdfIn PDF document text
    • https://kaxubivor.weebly.com/uploads/1/3/4/0/134097794/522d49.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477400/normal_5feaff141a91e.pdfIn PDF document text
    • https://febamepu.weebly.com/uploads/1/3/1/0/131070604/9839597.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416299/normal_60699ff722926.pdfIn PDF document text
    • https://xirazaju.weebly.com/uploads/1/3/4/8/134859293/cc35f9afb6.pdfIn PDF document text
    • https://nubesojobe.weebly.com/uploads/1/3/1/3/131398221/zepigonizure-mesevatukisirim-begizujamo.pdfIn PDF document text
    • https://kakizizutubune.weebly.com/uploads/1/3/4/3/134351089/2785417.pdfIn PDF document text
    • https://gatevipamor.weebly.com/uploads/1/3/4/8/134878843/9525919.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369655/normal_5ffa95a42ac21.pdfIn PDF document text
    • https://wujiwugamibi.weebly.com/uploads/1/3/1/3/131398142/3760109.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450747/normal_5ffb288d88df1.pdfIn PDF document text
    • https://xadijonoru.weebly.com/uploads/1/3/3/9/133997446/6464527.pdfIn PDF document text
    • https://nemanuvipiza.weebly.com/uploads/1/3/1/3/131398236/9817822.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/239837bd-548d-402e-a7b6-cc195257e685/what_is_neo_classical_theory_of_management.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a6339e0-1379-4c51-a770-173d667e7d33/41466813910.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6566406c-11fd-45ab-9f90-7469969ec5d0/spm_2014_english_paper_1_sample_answer.pdfIn PDF document text
    • http://fulusivijomu.pbworks.com/w/file/fetch/144437043/42828650781.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fde667f-2d7d-4f0d-a3f5-ddaf1ce8ee0f/55499116341.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69657ecf-b2b6-4bcf-ad02-fb7083aec4c4/10.snf_palme_corafya_soru_bankas_indir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1412a23-6354-44d9-8e7c-2c9c21232b70/garmin_dezl_570_traffic_not_working.pdfIn PDF document text
    • http://ziriwuru.pbworks.com/w/file/fetch/144493014/46211199461.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3ab7247-ec21-44f3-87f9-4c18a7ae1cb3/62624219853.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2081588a-a7af-4663-84a7-9a00f2d3e3e8/wills_eye_emergency_room_reviews.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_off00012040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12040 5020 bytes
SHA-256: 7f2dab5592f8ae8c0026e06b5794973ecb993f0ba85393f49723276bb8bdf738
font_01_sfnt_off00013131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13131 11404 bytes
SHA-256: a1afcdd1335a98e08921c5e049da03a8da512f137107784f4b6df132a18a228a