Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec0c8f424fcb4ed4…

MALICIOUS

PDF

76.1 KB Created: 2021-03-08 17:42:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 233e457651f0a05e03f3eae1cc0ed0f4 SHA-1: 94564e24a930a0530877645706c36f4bc5c0977a SHA-256: ec0c8f424fcb4ed4ea8c7a450ad37215dbee45157232bd8a0a4df5944d9242ef
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 0.9996

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://maypoin.ru/strik?utm_term=how+to+describe+a+sunny+day PDF link annotation
    • https://genunilime.weebly.com/uploads/1/3/4/3/134344847/6105873.pdfIn PDF document text
    • http://rerikadarax.iblogger.org/how_to_order_a_new_child_support_card_online.pdfIn PDF document text
    • http://bibeponuvizozu.iblogger.org/94619319655.pdfIn PDF document text
    • http://bojukekaj.66ghz.com/mirituzofojexifu.pdfIn PDF document text
    • https://subilitukufune.weebly.com/uploads/1/3/4/6/134629352/ridifinibul_perumoriderova_gogojebep.pdfIn PDF document text
    • https://rojanudase.weebly.com/uploads/1/3/0/9/130969060/1376962.pdfIn PDF document text
    • https://zokolukesowi.weebly.com/uploads/1/3/0/7/130776120/zagividepekuzul-tasovebejabaper.pdfIn PDF document text
    • http://vanebitedituki.22web.org/beforum.pdfIn PDF document text
    • http://wogizejelalod.iblogger.org/add_subtract_multiply_decimals_worksheet.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/1f86871d-af15-49cf-a70b-dcdc552e0398/zaxusugomotojusesije.pdfIn PDF document text
    • http://gamofoxil.epizy.com/activar_busqueda_por_voz_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95cebc91-395e-4731-8b84-4b3c2a048261/dunkin_donuts_caramel_latte_nutrition_facts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1da22a94-cd74-49b8-9b6c-2745ac5f95d7/27200394145.pdfIn PDF document text
    • https://041aa876-b65b-432c-96c0-58c8b295a4e4.filesusr.com/ugd/90d19e_3e4ef38bd67d43d9aafa3674cc335c48.pdf?index=trueIn PDF document text
    • https://a694a867-b0fa-45cd-b082-7f9abf80b1a7.filesusr.com/ugd/430cb2_dd416b088e1b46a2b9be1bf562bc1745.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba3b29db-cd00-4446-bf15-b7d032f30e9a/wofiperanu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97489386-ee55-43ec-a43b-0e2f0a06253a/how_to_change_schlage_door_knob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56e124b1-35af-469a-8860-55ecef1d84ea/92868604926.pdfIn PDF document text
    • https://b354d503-40d1-4c97-84b4-bc0b16c12f35.filesusr.com/ugd/8c7d07_c7b03c2c7b064ff7a4594705c7bde586.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/91107fbf-dcd1-48c6-a969-f3df10b12751/fifth_grade_math_worksheets_with_answer_key.pdfIn PDF document text
    • http://kapugekemasili.rf.gd/anthropometric_measurements_definition.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_off0000edad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAD 5196 bytes
SHA-256: e9268579c7486450bdf627ae3340f9e582202e134737106fed208b3d6568698a
font_01_sfnt_off0000ff79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF79 10588 bytes
SHA-256: e33e2ae7a87fba80f49f952c80cba7d6a93b214df8143921def7a287b15a1315