Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e543b5884f0d720…

MALICIOUS

PDF

82.0 KB Created: 2020-11-20 05:20:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 5fd64e8901db23f223c034aaec9888df SHA-1: 9cae6cab2a26ece33afe894e17b50a42f7f38b89 SHA-256: 8e543b5884f0d72019dff7c9f8a26d638b1828f56d1a406e519a5d6a3b2c9e67
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a redirector and a link farm. It contains numerous embedded URLs pointing to external PDF files, many hosted on disposable domains or potentially malicious infrastructure. The primary function appears to be directing users to these external resources, likely for SEO manipulation or to serve as a distribution point for further malicious content.

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://gettraff.ru/123?utm_term=tv+guide+bakersfield+ca In PDF document text
    • https://tenikekiso.weebly.com/uploads/1/3/0/7/130775729/jorotideminen.pdfIn PDF document text
    • https://lokixesope.weebly.com/uploads/1/3/1/6/131607163/logifiwakikabopef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451932/normal_5fa4845c129fb.pdfIn PDF document text
    • https://kunobutos.weebly.com/uploads/1/3/4/2/134234797/bixuwifoxuweka.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/kopiwu_gotatumeturi_bovejixegas_vivikow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393637/normal_5f9e57fc54f93.pdfIn PDF document text
    • https://buximinolid.weebly.com/uploads/1/3/1/3/131381316/7682712.pdfIn PDF document text
    • https://letitunonagafi.weebly.com/uploads/1/3/4/4/134494227/namari.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/bubisifapagefe/85319375980.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b5f3292-e9f9-463b-a69b-61589a5f945a/kuxufusisete.pdfIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/92679178679.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa69de23-3310-451e-b095-ea18f36c6e73/suxanugab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a95f11db-d507-4054-aac8-6e48c7e9f4bf/32284794487.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/zezimovex.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_off000100de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DE 5400 bytes
SHA-256: 22c51154c027c97616a7b4712bfa2019e2c419660a7df62e86e9d3b39b6aca17
font_01_sfnt_off00011359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11359 12104 bytes
SHA-256: 7affa427a9a20b980ae9c6cf72aabf5a65c299043f7d9c82f1e04ab3abde30db

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