Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9cbb8e24589def1…

MALICIOUS

PDF

99.7 KB Created: 2021-04-12 06:43:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 84948ad058c80a23db566d1279438971 SHA-1: 74211a119f3b9829b7019221374cf4c2071e9bb4 SHA-256: e9cbb8e24589def111c0b0c9c70ca4daa2ad43f9a07e2f2fc76e9897fbec35ab
186 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 0.9997

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=nueva+ley+de+ausentismo+laboral+en+puerto+rico PDF link annotation
    • https://vukedezesul.weebly.com/uploads/1/3/0/7/130776134/kexawuwa.pdfIn PDF document text
    • https://revegeworosopo.weebly.com/uploads/1/3/1/6/131637057/pefiwi.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/c6fcb5b5-1237-4d9b-a542-d2e1c1f43974/ejemplos_de_diagramas_de_flujo_en_programacion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/149a9989-dcde-4c4c-bd1e-e3e901611565/mimomukilufelevejen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63f8af83-83a7-4602-845b-56f680d6e377/64087122532.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e221effe-2f5c-4ea8-be86-05f604f9ad70/wetep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77c5360a-19f1-44d2-91c3-069a0ce6a857/10182472905.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bdf28db-2712-41aa-98ab-f20651522b82/how_to_use_ge_basic_timer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcee5106-5dd7-4129-933f-0ffd1c55f9c4/technical_support_interview_questions_and_answers_for_freshers_in_tech_mahindra.pdfIn PDF document text
    • https://2e4d99de-9d37-4ce2-abd5-0bbccafdbe51.filesusr.com/ugd/33a2e4_1c8532649be1431d812430ba0b162b91.pdf?index=trueIn PDF document text
    • http://bawesokiri.epizy.com/bulthaup_b2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efcd4208-b30c-4597-8f9a-4c1a912b97fe/bitifiwisap.pdfIn PDF document text
    • http://joposib.rf.gd/ashtanga_yoga_sequence.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e09be1eb-b099-4dc1-a80f-49b8e047eadf/95957295001.pdfIn PDF document text
    • https://a7ed8af5-5e4a-4eaf-98d7-51655494ca15.filesusr.com/ugd/b5c45a_c2d88b57fd904bc48529b93b723c95a7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/aeb38653-026b-44d6-aa0d-5be0bd848839/jewidelowitum.pdfIn PDF document text
    • https://ad9e3d1f-bb22-46ca-892e-b6aa3325a756.filesusr.com/ugd/837d34_50e3b2c9a7164d17bbe10e2e7ff5ccbe.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ab3b45b-1b49-4514-91c2-0ee028fe42e7/does_the_unofficial_harry_potter_cookbook_have_butterbeer.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_off00014487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14487 5488 bytes
SHA-256: 56535283574f2cf117cdace24aa48da6b911f19e746d344fdb4d8aff1d5106ce
font_01_sfnt_off00015725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15725 12764 bytes
SHA-256: df75b8f6cfcc1f9d69c50156233c2387174d7bf7982a3b32f63f3145d12229fc

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