Malicious PDF — malware analysis report

Static analysis result for SHA-256 5121c56c256840d1…

MALICIOUS

PDF

71.2 KB Created: 2021-04-03 19:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 6f15f51cce67a2825c52c82398bd785b SHA-1: 1194094236e6699d9837b80aad5cedd93a843285 SHA-256: 5121c56c256840d1d2bb6cf94d3f67c9ee31d66b94f330f2f99aee7cdcdf5e35
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous embedded URLs, many pointing to disposable domains, suggests a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common techniques for delivering malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://gukiduwonaxinef.getenjoyment.net/atal_pension_yojana_application_form.pdf In PDF document text
    • http://nujijaj.getenjoyment.net/tratamiento_nutricional_para_anorexia_y_bulimia.pdfIn PDF document text
    • http://sigisuzuk.getenjoyment.net/82452464080.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402252/normal_606791097d6da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495399/normal_60481b042da9c.pdfIn PDF document text
    • http://jadogaxarabu.mygamesonline.org/sujokimel.pdfIn PDF document text
    • http://nopotaz.medianewsonline.com/advances_in_behavioral_finance_volume_i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407303/normal_601456e35bade.pdfIn PDF document text
    • http://tozaworewinox.mywebcommunity.org/zetubozelusumafujexedi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369189/normal_5fe21053ac98f.pdfIn PDF document text
    • http://delozofize.scienceontheweb.net/bjt_configurations.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477138/normal_601a706fcbd80.pdfIn PDF document text
    • http://solifixogalek.mypressonline.com/libro_guia_practica_de_auditoria_administrativa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/o_fyKxYoRT8/wb?keyword=paired%20t%20test%20apa%20tablePDF link annotation
    • http://nufiwimuzobo.onlinewebshop.net/rosuri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db5d71ab-6733-4d15-9412-c275c0fb7369/62827883971.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2533de1-5112-4027-bd05-875486d66f20/how_is_maycomb_described.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f18ea3da-2e3d-4231-be0b-fa7c378c6038/edgar_allan_poe_quotes_pit_and_pendulum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ced9f0ae-6568-4f85-a782-a71f50ca0945/44224479506.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1331cb9f-1ca6-46c5-b62d-67f220301299/jaribedevasekaba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5c7ad5c-416d-4872-82bb-e3c62595c59f/jukasudareko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80c7af78-beb6-430c-ac25-1fc3783bd00b/90003643968.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/146da4bf-bc38-40ab-a9d4-4ba9c2c0979a/what_are_the_extra_catholic_books_called.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44096275-c1e5-4478-b708-f0c835b057a1/23766609917.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/329989be-d9ed-4f78-8071-b384de907f5f/39562181446.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_off0000d929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD929 5092 bytes
SHA-256: a9b4ad8608b7c4d44d8dbf32d54c6f945cf991eeb3e46e40fc1b6fa6e374c886
font_01_sfnt_off0000ea7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7C 10448 bytes
SHA-256: e8d5e01bfe6e78292bd46580efc702e69d94180b6c8683e20af6b9391340543c