Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca4495967d10dccd…

MALICIOUS

PDF

72.0 KB Created: 2021-04-02 13:39:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d99ff728ccaa87b63af326b9030fad77 SHA-1: 50e9991ac7c311856ab8fa9236f0f06340fc6432 SHA-256: ca4495967d10dccdfa8ce3fc2f432277add76b4868881534e3e872129f2deb97
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 0.9992

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://fokemale.ru/wix?keyword=st+john%2527s+lannon+preschool PDF link annotation
    • http://nufivuzelikonax.getenjoyment.net/definition_of_self_esteem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483081/normal_603e2c260a2e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465707/normal_6056584028f3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459628/normal_6058679dacb37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417212/normal_600fa95ed1adf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457279/normal_5fc86db420de0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370052/normal_60095d5e2cd9f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412568/normal_5fedfee50fbcf.pdfIn PDF document text
    • http://sarupunojupud.sportsontheweb.net/jenuxodasuduvenofufupemot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xunudijumo.myartsonline.com/dart_tutorial_for_flutter.pdfIn PDF document text
    • https://e6676b24-921d-4f57-8fca-beda98688f3c.filesusr.com/ugd/144d27_8905baab24be4b35b58a0afb92f2ae57.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fakuguvil/how_to_change_kenmore_upright_vacuum_cleaner_belt.pdfIn PDF document text
    • https://c72a6d71-2fad-4f5a-8b7a-a7c165485bce.filesusr.com/ugd/a4966f_d49bb1100f254d02aab45ff0fdf350db.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/coleman_mach_rv_air_conditioner_not_cooling.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/sesopa.pdfIn PDF document text
    • https://cf4de027-7369-46c2-bf93-d69cabef2b5e.filesusr.com/ugd/868b90_bc82e5535b684c679ee33386cdf0baf5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vexeliku/puzanigazum.pdfIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/eset_smart_security_premium_12_license_key_2022.pdfIn PDF document text
    • https://65de77fc-0341-4fd2-89b2-cd6b005a91de.filesusr.com/ugd/cf79db_2367a190dbbf4f04a148edd002af6184.pdf?index=trueIn PDF document text
    • https://ce83042b-5faf-46b5-bcbb-9b4d05ec7d33.filesusr.com/ugd/a31856_5c0dcaebbdd3467195910ce44d68c512.pdf?index=trueIn PDF document text
    • https://562a32fb-e9c8-4d8f-ac7e-a760da58c396.filesusr.com/ugd/68ec97_95b621aa03ef4d95b78690896aac8537.pdf?index=trueIn PDF document text
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_d181a97615b14b5183cf8c9a2c4f89e3.pdf?index=trueIn PDF document text
    • https://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_2541e638c93349dfb1e4daf1d42343ec.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_off0000dcd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD6 5232 bytes
SHA-256: b91ca642516a8f13b3292620f0237590d24483a195573d179b03ef0c5ce6c171
font_01_sfnt_off0000eea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA5 10796 bytes
SHA-256: 7377ed067c59452ce58c9044f6534f61576ec5581a3f96f2160a83b18259039a