Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae24ed19abe4f840…

MALICIOUS

PDF

80.2 KB Created: 2021-01-08 07:47:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: eba9ac53ae13da880adfb056731d6179 SHA-1: d8c7f49d384d6b2de8de37f7ed8b96a4e1c51515 SHA-256: ae24ed19abe4f84034395f99bb823eb169b573e05faf46c31c97fc45eb27d0ef
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document is classified as malicious and contains a large number of embedded links, many of which point to disposable hosting services and redirectors. The heuristic firings indicate it is part of a link farm designed to manipulate search engine results or redirect users to malicious content. While no scripts were explicitly extracted, the nature of the links suggests a phishing or SEO-spamming attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://traffmen.ru/123?utm_term=transverse+costal+facet+fracture In PDF document text
    • https://rexizoxulod.weebly.com/uploads/1/3/5/3/135399206/xuraf.pdfIn PDF document text
    • https://dudikojegak.weebly.com/uploads/1/3/1/4/131406444/3588b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418968/normal_5f964b79e5d2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369769/normal_5fe6330a4a8b4.pdfIn PDF document text
    • https://fanawilixu.weebly.com/uploads/1/3/1/4/131408209/9845282.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366973/normal_5f8a60d6ce933.pdfIn PDF document text
    • https://fosijegaden.weebly.com/uploads/1/3/4/8/134868146/2aff9e549ec306.pdfIn PDF document text
    • https://lolijejolo.weebly.com/uploads/1/3/4/4/134442146/lakikikopurawam-sajugivaxepaba-bobozufopoworu.pdfIn PDF document text
    • https://vubumixot.weebly.com/uploads/1/3/4/7/134751696/digam_zatuzeluk_nojenisetitemo_bosegokos.pdfIn PDF document text
    • https://migaxodilex.weebly.com/uploads/1/3/4/8/134852634/5f9e7.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/6b12b097-8e42-42fe-b9e1-a1b08d4e4335/24560925956.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_off0000fd8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8D 4884 bytes
SHA-256: fcac3acd37d3463b6806b708b6dd392653fc5cae387ad39b2dbefbce072ec925
font_01_sfnt_off00010e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3D 10624 bytes
SHA-256: 62ece7a37c7ac02a86af427e5b9ad9b76c86cee70648a33f1263c51ac37cc92e

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