Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8dce2f66a7505b2…

MALICIOUS

PDF

82.9 KB Created: 2021-03-06 10:23:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 68ea70d661298e8a2b97b82da13b24ba SHA-1: 362398c27a643e7752e02887473e925726637b9f SHA-256: e8dce2f66a7505b27315463c5374d2cffff7809c6b1a88503f5ab3a73044fc10
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 5

  • 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 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://pelibifir.ru/aws?utm_term=how+does+gdp+affect+the+standard+of+living+in+turkey PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4393189/normal_5fec0f9bd0845.pdfIn PDF document text
    • http://xozonline.ru/follow_up_patient_reported_outcomes3ok4d.pdfIn PDF document text
    • https://cdn.sqhk.co/woledibiroju/0ogdngj/pilomatrixoma_ultrasound_images.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415742/normal_601601cf1b37c.pdfIn PDF document text
    • http://naturka.space/bevedi6tlyc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377704/normal_600777d6d2b8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456685/normal_601d6a3c3a2d0.pdfIn PDF document text
    • https://cdn.sqhk.co/sowodopevew/bPq8e66/javatugulozuxukumonu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403533/normal_5fe4de0088448.pdfIn PDF document text
    • http://perfectiona.online/61595060036z7olw.pdfIn PDF document text
    • http://clipshd.design/kenoziwofuzuwuvumedumakuv7gg9o.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493195/normal_603acc0c89507.pdfIn PDF document text
    • http://mastera-saydinga.ru/noxuditidurimegunomuvofuccyfa.pdfIn PDF document text
    • https://cdn.sqhk.co/junulevi/gkKjdgc/sims_mobile_apk_unlimited.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/penefelomiju/29032278966.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/apostila_para_aula_de_violo_em.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_off000105c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C5 5696 bytes
SHA-256: abe5b1862aeda344151ac40c11b01e368266696ea573edcc20b7d76f0d3df402
font_01_sfnt_off00011940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11940 11084 bytes
SHA-256: c4fe7c22c9d2fa172e502a9a6d42c09ebe04c5a08d0814944404149502a6165c