Malicious PDF — malware analysis report

Static analysis result for SHA-256 7037d280a56bedbb…

MALICIOUS

PDF

38.2 KB Created: 2020-11-06 19:39:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: bf64d30bf1e1440d033b568ada901991 SHA-1: ef57361de36168da2fd4b3d3e433c3d9f05bf9ba SHA-256: 7037d280a56bedbb168e3c028aa57a38f0274094c5f1c5f53f69c75c986b9e73
184 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 an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/aws?keyword=uisd+school+calendar+2018+2019 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4405945/normal_5f9d918b7b711.pdfIn PDF document text
    • https://zewubonorow.weebly.com/uploads/1/3/1/3/131398185/9901598.pdfIn PDF document text
    • https://juzapojoxop.weebly.com/uploads/1/3/4/3/134370352/zinuvip-remod-kividarijit.pdfIn PDF document text
    • https://jugoruzaja.weebly.com/uploads/1/3/1/4/131407370/577277.pdfIn PDF document text
    • https://viwezoluzuwa.weebly.com/uploads/1/3/4/4/134401695/rosutizidugivop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://xixojis.files.wordpress.com/2020/11/komigafamoxovizewef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04f3f070-1e52-4cd8-b3bd-96e0f10dad77/xemakemamedegekipopufo.pdfIn PDF document text
    • https://gabigofu217261868.files.wordpress.com/2020/11/5590065990.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48ce8790-e89b-43b5-91ba-75723926464c/64399431826.pdfIn PDF document text
    • https://vukewakir.files.wordpress.com/2020/11/89304298430.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_off00005775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5775 5696 bytes
SHA-256: e03a7f7925c9b3a669442103e6f6c5ecc2b6cfe06b2f1c48a0c17be24d2ac854
font_01_sfnt_off00006ac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AC8 9852 bytes
SHA-256: 47ab859296a939928a78cfd4102ef9901dd401cd337ebfc1e1fe7c5efa6794fc

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