Malicious PDF — malware analysis report

Static analysis result for SHA-256 071eb21ff4a9273f…

MALICIOUS

PDF

78.5 KB Created: 2021-03-11 02:05:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: eff870f06a6ea0a447cadba6ac9fd3ac SHA-1: bfc4d86921c144826973400977885fe189d6d4b1 SHA-256: 071eb21ff4a9273ffdcf4d0119e627f13f0497fe3fff33f5f6a4bd9f927252db
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The primary URL, 'https://golowaki.ru/wix?keyword=twitch+tv+common+sense+media', appears to be a lure for search engine traffic. The document's structure and numerous external links are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://golowaki.ru/wix?keyword=twitch+tv+common+sense+media PDF link annotation
    • https://cdn.sqhk.co/wufevinek/IEBhgii/upsc_new_calendar_2020_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369495/normal_604944f26c889.pdfIn PDF document text
    • https://cdn.sqhk.co/buwaxaxodi/ehfzhgS/38921834642.pdfIn PDF document text
    • https://cdn.sqhk.co/vonirosidejo/jczYLjd/swot_analysis_sample.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489263/normal_5fe2c4cebed1b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381751/normal_5fc91add81612.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388063/normal_5fec6d33e5f90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426424/normal_601edb12dc5ca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365551/normal_5fc9dc284802d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366346/normal_6048d894a7d4c.pdfIn PDF document text
    • https://cdn.sqhk.co/zoribakim/jfhiCn7/67740337382.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470961/normal_6029d9d408cb3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379384/normal_6011e846972c2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bf68d742-fb98-404a-ab47-1dcf24f7df52.filesusr.com/ugd/83e7fd_c693e43bd4444f15b40523c73b752a7e.pdf?index=trueIn PDF document text
    • https://1416a32c-f91c-4ec3-9c10-bfdf610c7df7.filesusr.com/ugd/76de1a_c8fd883ac7a242f48da263c7263971b6.pdf?index=trueIn PDF document text
    • https://9e1e9198-0fe7-4103-8084-fdcc6befb8d5.filesusr.com/ugd/2f7815_d9b008e8089741ac83f66805bff46333.pdf?index=trueIn PDF document text
    • https://76f5a3e5-08d8-4581-9975-6c1b933a1845.filesusr.com/ugd/dbbd16_e065c3cad6af4ab0aae0e79c0a86817c.pdf?index=trueIn PDF document text
    • http://toxefokofa.epizy.com/amebiasis_hepatica.pdfIn PDF document text
    • https://27f1a270-5048-4778-87f0-574dfe85248a.filesusr.com/ugd/b7306e_cc3d09d9429d47ed9e9bba2da2b3acbf.pdf?index=trueIn PDF document text
    • http://dowupozor.epizy.com/beginner_pilates_reformer_classes_near_me.pdfIn PDF document text
    • https://f4f3dfe2-16bd-43cb-a294-7a39e49d2dbf.filesusr.com/ugd/cac9e4_27cb0d80cd9a40f9ac9fe4736e5ba675.pdf?index=trueIn PDF document text
    • https://d25e5d79-f3dc-43ab-8538-58f2f4730235.filesusr.com/ugd/898300_42b674a09da94589966c53b689769b08.pdf?index=trueIn PDF document text
    • https://2080fafa-2491-4ac3-8118-a138f33bff34.filesusr.com/ugd/822ecd_2fc553629be24f8ba87d45e9a32b7ae1.pdf?index=trueIn PDF document text
    • https://8964868a-aef6-4da0-9a9b-29de7c28e0c5.filesusr.com/ugd/b910ae_9e902d69ba734e5faa336585a04b297e.pdf?index=trueIn PDF document text
    • https://13fad4bf-7224-44b3-802b-16842e97d241.filesusr.com/ugd/b14664_6f7193c08ce74d03804848cd0d74f762.pdf?index=trueIn 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_off0000f7de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DE 5152 bytes
SHA-256: f1c63ebc1f16326f3e6508fa6d091ad07feaa78dde2a9839106c703934f7d590
font_01_sfnt_off00010959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10959 10240 bytes
SHA-256: 8ca7fef9cb28f6694bc1180fe71c88cff708a02097918c8a6cf7343942476107