Malicious PDF — malware analysis report

Static analysis result for SHA-256 76251991cbcb6e9b…

MALICIOUS

PDF

73.7 KB Created: 2020-12-15 05:13:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 61eb274e3997c802cc1afbd225b13809 SHA-1: 948f69ff1303bdfe0bee405e1a023d3228e05f12 SHA-256: 76251991cbcb6e9b659001a2d02f8a7f70935cee7e8eb979d9fa38e3ae93a40f
126 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 external links, many of which point to disposable domains or are used in a link farm configuration. This suggests a malicious intent to manipulate search engine results or redirect users to potentially harmful websites. The ML classifier strongly indicated maliciousness, and the structure aligns with SEO spam or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://trafftec.ru/aws?utm_term=platform+film+full+hd+video+mein PDF link annotation
    • https://dizogesutupini.weebly.com/uploads/1/3/4/6/134631076/fosadokewiw.pdfIn PDF document text
    • https://xekixudag.weebly.com/uploads/1/3/4/3/134336078/19f7e640dc1c.pdfIn PDF document text
    • https://tabogivazosepa.weebly.com/uploads/1/3/1/8/131871767/2882558.pdfIn PDF document text
    • https://luwutike.weebly.com/uploads/1/3/4/5/134518400/67850f6f.pdfIn PDF document text
    • https://meporolokiso.weebly.com/uploads/1/3/2/6/132681401/zavigika-dorisi-benisoponepuda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450638/normal_5fb9510a0fdf3.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/lanaladu/sawipekaz.pdfIn PDF document text
    • https://s3.amazonaws.com/wovitiku/dukevasewebegom.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc534cbe9fc3622d53e1cbf/t/5fd646d0df2f0204c2329051/1607878354088/9th_judicial_circuit_court_forms.pdfIn PDF document text
    • https://s3.amazonaws.com/kozibowisenatu/38313196983.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_off0000e3a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A9 5032 bytes
SHA-256: f470a0e907fe758da10f4a9f9017d15a259a57a0e602fa0c260d1f8d37e97bb6
font_01_sfnt_off0000f4a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A4 11112 bytes
SHA-256: ad80b2099eca6cd20ae771c5462b6f1981494de56cdac43059384f7065e913d6

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