Malicious PDF — malware analysis report

Static analysis result for SHA-256 78b97adbb3ba0af8…

MALICIOUS

PDF

92.8 KB Created: 2020-12-24 02:26:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 3d73d66fcab6e26bdb5a92635cf1f9fe SHA-1: e794bc8dad973754b36191dc5c2692aa3325bb26 SHA-256: 78b97adbb3ba0af87d7311995e424b3047380c7523c0b553bee3840b6f55cd7e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many of which appear to be part of an SEO link farm. The document body, though heavily obfuscated, suggests a lure related to dog breeds. The primary malicious activity observed is the redirection to potentially harmful external websites, likely for SEO manipulation or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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://trafffi.ru/strik?utm_term=razas+de+perros+pequenos+para+ninos+alergicos PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459319/normal_5fbed61730b03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402478/normal_5fb9129d5ccf0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386091/normal_5fe10c0b13881.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416494/normal_5fd6ccb4e105f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487663/normal_5fcb531bb8360.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485579/normal_5fb96d468bca1.pdfIn PDF document text
    • https://gezeteweni.weebly.com/uploads/1/3/4/0/134040803/xekopixal-xoxowuvef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413113/normal_5fdd302615734.pdfIn PDF document text
    • https://bilewazivabo.weebly.com/uploads/1/3/2/8/132816117/fudiv_nirexunetu.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/jolon_koxuzozudanik_makilitinami.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/482f93ff-aa55-4b5f-9f03-8e5586bc1a6d/tapipesexerezizevev.pdfIn PDF document text
    • https://s3.amazonaws.com/sowirutelevolur/google_docs_api_create_document_from_template.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_off00012c19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C19 5424 bytes
SHA-256: 9096bd011b5b50094bccacd95b645b3619cf81a7e12ed8efd56eb289f64e06de
font_01_sfnt_off00013ea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EA0 11656 bytes
SHA-256: 56b994f889c45d8e3aa953c8b8d41bd4fd14c61fe24390f666e44e9c04d15bbc