Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f88e345a9adf8d9…

MALICIOUS

PDF

70.3 KB Created: 2020-11-20 07:57:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: d267d9edab48d2597dae9b0bc0519ea5 SHA-1: 7dd45dd77421e515f296ec0805cb081b4a27879f SHA-256: 5f88e345a9adf8d95b1ab12822c455b3ad638a8645e858af886a0455a37d8014
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm on disposable hosting, suggesting a phishing or SEO manipulation scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites, likely for credential harvesting or malware distribution.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffe.ru/strik?utm_term=palabras+llanas+con+tilde PDF link annotation
    • https://vupimolafi.weebly.com/uploads/1/3/1/3/131398504/1084261.pdfIn PDF document text
    • https://rixokofumi.weebly.com/uploads/1/3/1/3/131380985/69ee4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368731/normal_5f9e21f7c1dd9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383801/normal_5f9de03f5ab4a.pdfIn PDF document text
    • https://pavowojavujide.weebly.com/uploads/1/3/1/3/131398322/xawamowexijeto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418746/normal_5fa49cb057677.pdfIn PDF document text
    • https://tiposowa.weebly.com/uploads/1/3/1/1/131164246/1e86a6a171d.pdfIn PDF document text
    • https://lawofudoto.weebly.com/uploads/1/3/4/8/134854676/sunomi.pdfIn PDF document text
    • https://gutamunimidujad.weebly.com/uploads/1/3/4/6/134667749/luwexovuvetum.pdfIn PDF document text
    • https://wofenexezut.weebly.com/uploads/1/3/4/3/134310974/32e71f4940c7.pdfIn PDF document text
    • https://vilukenuxe.weebly.com/uploads/1/3/2/8/132814007/dijomebasapav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420238/normal_5fa8446185e3c.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/kekunawi/48728573477.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/thermochemical_equations_calculator.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_off0000d337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD337 5072 bytes
SHA-256: 6748f2478c9dcd2069a6f66f8b5920d2cdcd48a7e96deb785297347167487956
font_01_sfnt_off0000e47a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47A 11820 bytes
SHA-256: 331659264c59242ed20286ff382bc574267572ecc00988aee6bef47e9b2ca758

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