Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca0b8314e82993ac…

MALICIOUS

PDF

82.3 KB Created: 2021-03-10 08:47:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2ef8d82ea4f2a630d7333ed1d0390287 SHA-1: 3b3a4a99caa4979b80075e1d379c71015e665435 SHA-256: ca0b8314e82993ace8cfe78033cc4196566c6813a75dfa5f51e417ea529b9091
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/wix?keyword=turn+right+at+machu+picchu+free+pdf PDF link annotation
    • https://cdn.sqhk.co/dabebasavus/Sji4CQV/chess_tactics_and_strategy.pdfIn PDF document text
    • https://zuvimetuna.weebly.com/uploads/1/3/5/3/135304981/lotiwozuxosan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449205/normal_602c2ecf9e2c4.pdfIn PDF document text
    • https://cdn.sqhk.co/welosezu/q9gcfjh/27085876217.pdfIn PDF document text
    • https://cdn.sqhk.co/mobixipotex/M8dhajh/70188006643.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401972/normal_5ff40c9dd90a1.pdfIn PDF document text
    • https://muvebodexiju.weebly.com/uploads/1/3/5/3/135311879/gelukatilowaderes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480383/normal_6002f2e1ae9e2.pdfIn PDF document text
    • https://cdn.sqhk.co/wezufunin/iciaojs/world_conqueror_2_medals.pdfIn PDF document text
    • https://cdn.sqhk.co/velabolo/Mgcv4jg/35748226187.pdfIn PDF document text
    • https://nexawukuvinu.weebly.com/uploads/1/3/4/5/134578226/8682ba32704.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://bobitemobo.epizy.com/cerita_rakyat_adalah.pdfIn PDF document text
    • https://s3.amazonaws.com/fusopoxipo/building_inspection_report_template_free_nz.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/xobez.pdfIn PDF document text
    • https://5a6df620-610b-4d6f-8f1b-71e936bb70bc.filesusr.com/ugd/1f5cef_e55f795d16c944ab881112d177b48b92.pdf?index=trueIn PDF document text
    • http://delozaroj.epizy.com/weredalomosa.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/46354262721.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/gafinuwejajixur.pdfIn PDF document text
    • https://551f0ad2-75d1-4009-b90b-2f3e3e20230b.filesusr.com/ugd/c2bf0a_db9b185fdaad429aa6b287b255d83ae2.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74A 5080 bytes
SHA-256: 08bb3fe62b7673c9935b4f8c79f489a767f021531e1562da1c7fcaf2894774c0
font_01_sfnt_off0001085a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085A 11144 bytes
SHA-256: 1efbbdc45710eceab63860b36e8b5d2e4c696a655998921b9b3cd3c2c8b92dee
font_02_sfnt_off00012dd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD1 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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