Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8b22c806e285bd9…

MALICIOUS

PDF

65.0 KB Created: 2020-11-17 15:52:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 8e62e3f288cb68d3be61fed083bb32f6 SHA-1: 52e5137ddc3e5b85111e5a5f30cc415502c87159 SHA-256: c8b22c806e285bd90f9485795e4a70d5d32274e4ece13a4c9fa73fb8d5ff3fad
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting services, and one critical link to a known malicious redirector. This indicates the document's primary purpose is to act as a link farm, likely to distribute malware or conduct phishing attacks by directing users to malicious sites. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://ggtraff.ru/strik?utm_term=electronics+and+communication+book+p In PDF document text
    • https://fagisidide.weebly.com/uploads/1/3/2/6/132682833/gisikorukox-losubunavovide-kagilorixevuw-fuwewi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412900/normal_5fa3852915db0.pdfIn PDF document text
    • https://gazesomudari.weebly.com/uploads/1/3/1/0/131070071/jifozit.pdfIn PDF document text
    • https://movidotibapokab.weebly.com/uploads/1/3/4/2/134265591/9349732.pdfIn PDF document text
    • https://wirukibit.weebly.com/uploads/1/3/0/9/130969322/6738325.pdfIn PDF document text
    • https://gejatovuri.weebly.com/uploads/1/3/1/4/131406669/7470081.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/4b81b229-a101-44a8-9808-e423acb7a375/vosagabunedemulozajusiko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88c3e9d0-9417-44a3-b70e-75c2d32cdbb2/exodus_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/445a8faa-8f3a-4244-a418-f5b42709f20b/peputanaruremafuganex.pdfIn PDF document text
    • https://s3.amazonaws.com/jexijer/72779075273.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_off0000c285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC285 5380 bytes
SHA-256: 5c4e836a897668c42f6ee32231d95314a39a058bb4f7708074bf54b6ff3f6b0d
font_01_sfnt_off0000d4b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B7 10276 bytes
SHA-256: ed22f8e5d0ecf45b107de979c05a3b2c1c5727b0cfb98d9f1444e7ea1014d52a

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