Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceb8bfbc4d66b8b3…

MALICIOUS

PDF

75.9 KB Created: 2021-03-24 04:57:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 4117ebc5c6f0702dba803252a214ba2f SHA-1: f5ff1a5900f72189998be6b42d0bcc5a5160162c SHA-256: ceb8bfbc4d66b8b32e6716f0a5d34a09612f45935ce950c1a789898dc97412c7
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, exhibiting characteristics of a link farm. It contains numerous external URIs pointing to disposable hosting domains, suggesting an attempt to manipulate search engine results or distribute further malicious content. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, likely contributes to the malicious functionality by facilitating redirection or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://ponafet.ru/strik?utm_term=how+long+for+baby+to+get+in+deep+sleep PDF link annotation
    • https://fajimidisuwa.weebly.com/uploads/1/3/1/6/131606183/776cc70.pdfIn PDF document text
    • https://gudosotavuna.weebly.com/uploads/1/3/4/7/134722070/7767774.pdfIn PDF document text
    • http://xariketixagat.mypressonline.com/mujorefedazama.pdfIn PDF document text
    • https://jenejipita.weebly.com/uploads/1/3/4/4/134473981/votopexobuzeg_fegirozodaj_ranibiga.pdfIn PDF document text
    • https://cdn.sqhk.co/vizodejo/Wgi9prG/88644774577.pdfIn PDF document text
    • http://nenonazuf.scienceontheweb.net/vuvasotisajuwemi.pdfIn PDF document text
    • http://lakujalinifibo.mypressonline.com/frases_hechas_en_ingles_para_redacciones.pdfIn PDF document text
    • http://nafigunagofadab.getenjoyment.net/10090976921.pdfIn PDF document text
    • https://cdn.sqhk.co/puwukuwos/apfggig/dragon_raja_all_hidden_recipes.pdfIn PDF document text
    • https://bazodezivif.weebly.com/uploads/1/3/6/0/136088162/selatubexuxavi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bapexuzajo.epizy.com/cyborg_foundation_informacion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8deb228f-03ee-4092-b919-ec5476609db7/sebutkan_47_proses_project_management_dalam_bahasa_inggris.pdfIn PDF document text
    • http://winigoset.rf.gd/bifatalodiwubi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8acc86a-ed0b-496b-8744-595737b32bc0/educational_psychology_phd_programs_in_usa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66de506c-3d50-41c5-ad92-b2e887e32d15/how_much_should_i_charge_for_designing_a_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1feb297b-d4f0-422f-a7c4-145810d9c2de/jitterbug_perfume_quotes_erleichda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/246052f3-1d42-412f-b429-64ee92fd0443/most_uncommon_last_names_in_australia.pdfIn PDF document text
    • http://lurilufe.epizy.com/kitchenaid_artisan_burr_coffee_grinder_cream.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_off0000ea51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA51 5504 bytes
SHA-256: 059d9b2aa3e18452dd26fe520feef529fa11461e76bbef1916aa05cca0270874
font_01_sfnt_off0000fd2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2D 10344 bytes
SHA-256: 916c40dec478837691d70be10eb2f917acb9c4d85d03837cc43922053b0446ae

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