Malicious PDF — malware analysis report

Static analysis result for SHA-256 95a57b5bf523e224…

MALICIOUS

PDF

87.1 KB Created: 2020-11-25 14:24:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: d2d7691a08737638059e7be2691f8f86 SHA-1: 31857f1e302aaf89696e267e945b710816cf815a SHA-256: 95a57b5bf523e224810292487543bebc0958bf94395df52929babca9e603623b
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external PDF files, indicating a link farm designed for SEO manipulation. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these linked resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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/strik?utm_term=swtor+dps+rankings+5.9 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368759/normal_5fb2ddefb78a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366989/normal_5f8c40718381f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374860/normal_5f8aec5f2f933.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366637/normal_5f929e12f018f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371514/normal_5f98510898a06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408875/normal_5fa3554ec9306.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455185/normal_5fa306cdbe1e5.pdfIn PDF document text
    • https://dituxunejew.weebly.com/uploads/1/3/4/3/134324597/tulek_vozegevoxuvixiz_pozekiriwitu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370071/normal_5f8af23b43438.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445882/normal_5fa42682ac682.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/b8e21fc9-d8f0-47b5-865a-5ac14c3c5a20/vulawejepogamaku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f1af645-f2f7-455e-b5c0-48d3fbe268cf/mizobapofiramefofopab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/871ca10a-6bf9-4626-85fc-0d17d3558c3e/98168212404.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Related samples 4

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

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB21 5336 bytes
SHA-256: dff0eacb7e76357e9af8cca077674925030c0b21a4e3294557f6a2130980c6cc
font_01_sfnt_off00010d55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D55 5756 bytes
SHA-256: b3061afed70d05ba344a5ac409eb4024750f3cf1ed734e31f2e436bddd761f4f
font_02_sfnt_off00011bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBF 10836 bytes
SHA-256: 2baef3747052a2a20695f9cf0a39697dbaa17d4368afa3b00f956e723bd20648
font_03_sfnt_off000140d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140D2 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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