Malicious PDF — malware analysis report

Static analysis result for SHA-256 620b5be7418be113…

MALICIOUS

PDF

72.5 KB Created: 2020-12-23 12:01:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: d5505d98139fd238f69c87f97e2cf8df SHA-1: 8523c36033ac201a375b3197c005675c37770d9f SHA-256: 620b5be7418be113b02147e32c3f9e16c4bfd8a118b5eea7572305eba6f074c1
244 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and point to other PDFs, indicating a link farm designed to manipulate search engine results or distribute malicious content. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting the ultimate goal is to lead users to a malicious site. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely for phishing or malware delivery.

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://traffking.ru/strik?utm_term=chocolate+cake+recipe+without+eggs+or+milk In PDF document text
    • https://datevapo.weebly.com/uploads/1/3/4/3/134338939/8628112.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444636/normal_5fc3f2ebdd2f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407997/normal_5f9596aeabb85.pdfIn PDF document text
    • https://vakozumemarob.weebly.com/uploads/1/3/1/0/131070483/kideraxote_rujubitu.pdfIn PDF document text
    • https://zukodefikarux.weebly.com/uploads/1/3/4/4/134498552/7162223.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471475/normal_5fa5ebc886424.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380699/normal_5f8c12bd33332.pdfIn PDF document text
    • https://debuvubuni.weebly.com/uploads/1/3/4/8/134846467/1910508.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496165/normal_5fd33a70b866a.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/rilexazejuzovep/36736627050.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99a64626-8bf6-4ff5-9693-c3fe8c11f65d/beets_bears_battlestar_galactica_shirt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc73f32c-85a8-4146-8fae-6cccf8a6b0c7/80025839035.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_off0000dc01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC01 5408 bytes
SHA-256: 05b38917eeaf11d250d13f808045f8fab10ccd407eaf0521cd5661947c3d4622
font_01_sfnt_off0000ee4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4F 11260 bytes
SHA-256: e559ca4bf6923d3f0cf3818a3975606d0ac54f8644c1c264b04fa9d006e70d98

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