Malicious PDF — malware analysis report

Static analysis result for SHA-256 05611235fd519ab4…

MALICIOUS

PDF

76.8 KB Created: 2021-01-08 18:00:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 04d715d2f423e65b9eed8418267f5b4d SHA-1: d425d0efc7e5dabc8685a044fd0659a8c9a04b09 SHA-256: 05611235fd519ab41da9c7a89103c0f879d579618e51eb2fd54b58ced27f4119
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, specifically identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. It also functions as a link farm, directing users to numerous external PDF documents, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://ggtraff.ru/aws?utm_term=uttarakhand+open+university+online+form In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370064/normal_5f88d0b675700.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372980/normal_5fa95001bc4f8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457014/normal_5ff298994ae39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371543/normal_5f9d8f2c47336.pdfIn PDF document text
    • https://kisetujetu.weebly.com/uploads/1/3/2/8/132814277/nitusuraw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426407/normal_5fc1b964cc0a2.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/tiluwisulepam/ap_us_history_review_packet.pdfIn PDF document text
    • https://s3.amazonaws.com/vasofirida/kubunomadopi.pdfIn PDF document text
    • https://s3.amazonaws.com/zalisujezajaje/85363627828.pdfIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/44555439008.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6835be0-ff00-4dfd-8c2c-94c80169ac0a/87374999441.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b5b287c-ae46-46cb-ba81-d3ed59730a01/15137559563.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED48 5500 bytes
SHA-256: 3b0c7f99cfba4f3ba4ebd1915acc7899c613fa0c753bec3a08b67fb46cc99bdd
font_01_sfnt_off0000ffe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE4 11864 bytes
SHA-256: 7db4ece4adba27ef473c77bd6303758bc39e272547d7ecd168848111dd59f3cf

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