Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fc39a546dc3c5c3…

MALICIOUS

PDF

73.7 KB Created: 2021-06-05 12:48:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 2ff3ad43f211a5d40fa15926f8eeadb0 SHA-1: e96153758f1bc9f02548f35e359eaee2aa227983 SHA-256: 9fc39a546dc3c5c3bf54dbe05ab7bb19021005ec74f0187b4cec698d124368ad
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 5

  • 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.
  • 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://irlanc.ru/pbw?utm_term=how+to+use+netgear+wifi+extender+ex2700 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413564/normal_5fe468e8ad46c.pdfIn PDF document text
    • https://lepoxaxilil.weebly.com/uploads/1/3/4/4/134498836/bonukodapuvojusevema.pdfIn PDF document text
    • https://gudozegibuxof.weebly.com/uploads/1/3/4/7/134732985/risukudavuv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416500/normal_6002d5f43fa2c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465006/normal_5fe5efc9b1d1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491155/normal_605f39df050ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369173/normal_604dcae92057d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478393/normal_605589850df7e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415745/normal_6005387221a59.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/b2475eed-51d3-45ae-b5cd-26e429d7a637/72349140675.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6f71934-207c-467f-b985-b7c7e235dc55/descargar_civilcad_para_autocad_2020_64_bits__crack_gratis.pdfIn PDF document text
    • http://xuvabufoj.pbworks.com/w/file/fetch/144556227/22415599418.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/530107a8-3898-4a75-b6e0-2182eb2ba8ec/vocabulario_y_pronunciacion_en_ingles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c3773d8-3ca5-4dad-acf0-45239c9b26fa/heart_of_darkness_part_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69f417c0-c023-4fd0-810f-233f070af626/20523205447.pdfIn PDF document text
    • http://wozixokumo.pbworks.com/f/what_kind_of_vet_care_do_guinea_pigs_need.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_off0000e3d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D5 5516 bytes
SHA-256: 27552995846e3f278d93cadf4ad4a04360594379cdb83caf40ff5dd491d4d062
font_01_sfnt_off0000f6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C2 10076 bytes
SHA-256: 6b407e188a27b71f3ab2ecef82b2d3673d6582a41f283ffbec34343ceda57a76

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