Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cc47ca9656f27e9…

MALICIOUS

PDF

38.1 KB Created: 2020-11-08 12:28:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 42775db5876fdc71c504c79a9e2fc6a1 SHA-1: 95d4c002046caa0b03564d3906663820f67f7311 SHA-256: 6cc47ca9656f27e9668b6aea6ab0bf4ec50864dca77c3ffb4f0a07200a99514e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, identified as a link farm. The ML classifier strongly indicates maliciousness. The primary purpose appears to be SEO manipulation or directing users to potentially harmful content hosted on various disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://traffset.ru/123?keyword=free+au+and+aw+worksheets PDF link annotation
    • https://gedejapel.weebly.com/uploads/1/3/4/3/134314995/1360357.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454679/normal_5fa082c95ff59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450639/normal_5f9ec2ca54188.pdfIn PDF document text
    • https://jirukikemika.weebly.com/uploads/1/3/4/3/134310088/mupojitazego-xeweguk-lusemuxegapuso-feragomozu.pdfIn PDF document text
    • https://nobinetezo.weebly.com/uploads/1/3/0/9/130969761/6b3d598.pdfIn PDF document text
    • https://pisanofinupu.weebly.com/uploads/1/3/1/4/131437881/7694483.pdfIn PDF document text
    • https://rimuzomidaz.weebly.com/uploads/1/3/4/3/134353295/nedabisedazipok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413705/normal_5f9713cda3184.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365619/normal_5f8b98e78b4be.pdfIn PDF document text
    • https://watuboxe.weebly.com/uploads/1/3/4/5/134588214/1750878.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380384/normal_5f910f71ab95f.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/0271139d-06aa-4ddb-9933-48efbbfd7620/tevufugu.pdfIn PDF document text
    • https://rogiwojugafi.files.wordpress.com/2020/11/bekuv.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_off00005679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5679 4992 bytes
SHA-256: fd93ce778b362dcd6613e549b00e1783567e49db729fafcec7ce0b0cf9cd0019
font_01_sfnt_off00006782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6782 10804 bytes
SHA-256: 1458d9b9eecbce40159e7647c7e25aeee943c6bcc0f25ca71aba009aa7bd1876

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