Malicious PDF — malware analysis report

Static analysis result for SHA-256 eefebf42fdce35e8…

MALICIOUS

PDF

77.5 KB Created: 2020-11-18 09:32:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a12775fa47f244801f1c9fb311cbe5e7 SHA-1: 28e05e8e12d690caa15e592d4b0451ad5c8bc0e4 SHA-256: eefebf42fdce35e89a7129ac0eda8695e3e63f6111d77e5e3698f69c385c1e73
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 0.9998

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://traffking.ru/strik?utm_term=toastmasters+youth+leadership+program+pdf PDF link annotation
    • https://jonukejunuxesa.weebly.com/uploads/1/3/1/4/131409236/13d71d437be.pdfIn PDF document text
    • https://suzuxagutif.weebly.com/uploads/1/3/4/3/134352905/gowiwaji.pdfIn PDF document text
    • https://voduzivet.weebly.com/uploads/1/3/1/6/131607522/wokufapab.pdfIn PDF document text
    • https://pimelotug.weebly.com/uploads/1/3/4/5/134576353/a2a815b22a3465.pdfIn PDF document text
    • https://jarapitoxedomel.weebly.com/uploads/1/3/1/4/131437170/jimipegiwovug.pdfIn PDF document text
    • https://woxukobu.weebly.com/uploads/1/3/4/3/134392577/venuk.pdfIn PDF document text
    • https://pesajupamobe.weebly.com/uploads/1/3/1/6/131607203/vonefamap_jemov_zajijazif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/suximawo/air_transport_essay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06d5b46c-9003-4c8e-93d4-9d34894161cd/lesarexovosixos.pdfIn PDF document text
    • https://s3.amazonaws.com/xutomoxu/rixavuzopofof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50fc747e-1ae9-4d75-beb2-5e655e4d1c60/5820282604.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_off0000f1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AF 5504 bytes
SHA-256: 117eff9f2c48ef24064b6cd0946278109175d8c759a7fabd60345da6afdf5e13
font_01_sfnt_off00010449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10449 10712 bytes
SHA-256: 3c1dddafd125b4bc28fbc30fbd3e34e3c669b9aa7f981466ef52b711aa07610f

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