Malicious PDF — malware analysis report

Static analysis result for SHA-256 eba4866547c8f8ce…

MALICIOUS

PDF

77.3 KB Created: 2021-06-09 13:52:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3d62f2fb6953028eec1709e18665de15 SHA-1: 1ea081abca232992441e7a1261e9849bb7d04be4 SHA-256: eba4866547c8f8cef5f93b90877677ab94bfe73992be22ed24c71d49287e4e1d
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://ponafet.ru/123?utm_term=worksheet+2.+6+the+chain+rule PDF link annotation
    • https://pipalilivo.weebly.com/uploads/1/3/4/3/134310902/mulaposabaze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368760/normal_605b710784610.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445731/normal_60bdcb54219ef.pdfIn PDF document text
    • https://lajibomigijiku.weebly.com/uploads/1/3/4/5/134587714/4971320.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454303/normal_5ff5fafe6c241.pdfIn PDF document text
    • https://bivamotitujodo.weebly.com/uploads/1/3/4/7/134712473/6bddc003300.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480753/normal_5feb1b9944c13.pdfIn PDF document text
    • https://fekanefitogi.weebly.com/uploads/1/3/4/3/134340372/repimoto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455657/normal_6049ba7b9c266.pdfIn PDF document text
    • https://zalorapowil.weebly.com/uploads/1/3/1/8/131871687/91bd2260.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421207/normal_604cb0ffcca4e.pdfIn PDF document text
    • https://gabejudunutulan.weebly.com/uploads/1/3/4/8/134887900/9410a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488810/normal_5fdc128478ccd.pdfIn PDF document text
    • https://xonuvalax.weebly.com/uploads/1/3/1/4/131437330/polodomemozipo-zesimejipi-pinaju.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce003aef-3226-4ef5-83e5-802ca4e4e3a8/la_otra_historia_de_estados_unidos_howard_zinn_resumen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdc8dd54-f8ac-4352-a7e6-ea15fe1bcd2a/aviation_weather_forecast_charts.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_off0000f241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF241 5284 bytes
SHA-256: ff08c12d8cb167ab9b4250002696209d94e6af5e8e0a96d76d96e43abf21861d
font_01_sfnt_off00010449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10449 10680 bytes
SHA-256: 1607b63a623333e0f6dd580d26fd5b533c373f522e34fdd282de3c84e6e3eb42

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