Malicious PDF — malware analysis report

Static analysis result for SHA-256 401c72f2eb50f184…

MALICIOUS

PDF

74.6 KB Created: 2021-04-14 23:27:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c0c43771dde51f6dc2a352bbeca68ef7 SHA-1: 755c3795d90f17d0e0f3159369fe41b359f0e7c7 SHA-256: 401c72f2eb50f184e671c8f70aab415083c6815d23d77fe1cb1a4e467e45614a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large farm of external links, many hosted on disposable domains, suggesting a phishing or redirection scheme. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/strik?utm_term=ge+profile+microwave+handle+peeling PDF link annotation
    • https://jabenawonidibe.weebly.com/uploads/1/3/5/3/135385032/jatire.pdfIn PDF document text
    • http://fukerijinexin.mygamesonline.org/tarsal_bones_anatomy.pdfIn PDF document text
    • https://vixezijimike.weebly.com/uploads/1/3/5/9/135993975/xaxodunut.pdfIn PDF document text
    • https://jutewalezozapon.weebly.com/uploads/1/3/4/0/134016751/2929083.pdfIn PDF document text
    • http://ridovise.sportsontheweb.net/does_princeton_review_improve_sat_scores.pdfIn PDF document text
    • https://cdn.sqhk.co/rovujesox/chc7qgj/shopdisney_masks_review.pdfIn PDF document text
    • https://viwosexoteb.weebly.com/uploads/1/3/4/6/134631328/fapevikuka.pdfIn PDF document text
    • http://retamos.mygamesonline.org/pdf_alternator_manual.pdfIn PDF document text
    • http://rulajamizap.getenjoyment.net/auditing_and_assurance_services_an_integrated_approach_14th_edition.pdfIn PDF document text
    • https://gawozigojuvapa.weebly.com/uploads/1/3/4/8/134896601/5954753.pdfIn PDF document text
    • https://cdn.sqhk.co/numokafas/iBgcOfk/34410421567.pdfIn PDF document text
    • http://tavegumata.sportsontheweb.net/libro_verde_ganoderma_lucidum.pdfIn PDF document text
    • http://wegoluxetas.scienceontheweb.net/john_grisham_books_in_order_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://933527c5-e005-4225-a3aa-05fee46c7696.filesusr.com/ugd/b51dd5_50ebec337c594d0595778f6a95ec2052.pdf?index=trueIn PDF document text
    • https://a3cd4400-5fdc-4e6a-bda8-88556a2d4d1f.filesusr.com/ugd/2f7489_0bfa3f862b5f45d296f13d64f557c284.pdf?index=trueIn PDF document text
    • http://luvepel.myartsonline.com/26073113672.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_off0000e59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59C 5576 bytes
SHA-256: 361d2e8741693bbac5ed9f658a9863f5dcad1fa8fcf90bff550912912e4ae15b
font_01_sfnt_off0000f881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF881 10792 bytes
SHA-256: a148da186f64a90bda677e6386e4249510ce0ad3737ffccff3fbbfc0187d458e

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