Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a4ccf08eb061cdd…

MALICIOUS

PDF

76.6 KB Created: 2020-12-25 07:55:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 8a744848dee83e11448d181cb74e9a64 SHA-1: dcd4e5cf1340c4b00b135424e4aec61cf7aa771d SHA-256: 6a4ccf08eb061cdd0e0ec6cd0fe1ee2e5fcd307888fb5c0fa71f84cf7e19ba26
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 external PDF files, which is indicative of a link farm. One of these links, 'https://traffking.ru/strik?utm_term=vegas.+com+promo+code+november+2019', is identified as a known malicious redirector. The ClamAV detection and ML classifier further support the malicious nature of this file, suggesting it is used to distribute or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=vegas.+com+promo+code+november+2019 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4380219/normal_5fa5306b887d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379498/normal_5f9c62d34cf6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370737/normal_5f89ea2962ad7.pdfIn PDF document text
    • https://gazelavulokar.weebly.com/uploads/1/3/4/2/134265358/bee586ef9965387.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380223/normal_5f8f060da0598.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410020/normal_5fe52fcae840f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386606/normal_5fc697d4d05b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450516/normal_5faa1d4c2c26c.pdfIn PDF document text
    • https://vuxilimibipemop.weebly.com/uploads/1/3/1/4/131453056/fufirasabareguxil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406820/normal_5f9b953c0faf5.pdfIn PDF document text
    • https://ruritetij.weebly.com/uploads/1/3/4/7/134704214/fd0570.pdfIn PDF document text
    • https://takewinedol.weebly.com/uploads/1/3/4/7/134768260/golelolobajapoko.pdfIn PDF document text
    • https://danevetiwa.weebly.com/uploads/1/3/4/6/134600357/017ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367944/normal_5f8a9a58eaf19.pdfIn PDF document text
    • https://xisegebimir.weebly.com/uploads/1/3/4/3/134340076/ritaxebotale-donuvulijul-fufodowexuvel-ponigisodorerug.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ebd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD7 6040 bytes
SHA-256: 2fae1145fba78dd3fc86032cd1edf2581ad959e5f214e809f708f6ea46fdbfcd
font_01_sfnt_off00010060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10060 10772 bytes
SHA-256: aa275921d25a476a8c4d2c0e4c3b6601a600de9e2a91159839038bca692768af

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