Malicious PDF — malware analysis report

Static analysis result for SHA-256 feac61809ec10f0d…

MALICIOUS

PDF

39.2 KB Created: 2020-11-06 15:55:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 7de5c1011f9e30b34f80066ba20f4c43 SHA-1: d8c98c54d19ee403f40a8ea9bb12f10c0e2d7919 SHA-256: feac61809ec10f0deb371df2051205696ce5100b24e2f14380a016896aae1d7d
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://trafficel.ru/strik?keyword=mechanical+energy+problems+worksheet PDF link annotation
    • https://tunimesepet.weebly.com/uploads/1/3/1/4/131455680/4357605.pdfIn PDF document text
    • https://zukamukenipebo.weebly.com/uploads/1/3/1/3/131380388/2f3d6019b1.pdfIn PDF document text
    • https://rafuwufavirose.weebly.com/uploads/1/3/4/3/134334278/xibiwi.pdfIn PDF document text
    • https://pefopurez.weebly.com/uploads/1/3/4/3/134375846/bajanowugubo.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/ba7d78d5-6db2-4c10-a30d-d3670526621a/kegabovaluv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8daee425-b5ac-445b-b506-322f7c70444b/44441376193.pdfIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/480i_vs_240p.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fd9c6f1-20e8-4a44-9452-7e4f017f7bc4/80413497471.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/368f0162-0e7f-41ea-b4b9-bbdfb0733f05/count_ugolino_dante_s_inferno.pdfIn PDF document text
    • https://fimalul.files.wordpress.com/2020/11/xenikefeg.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/resolowiwiroxarakuw.pdfIn PDF document text
    • https://jopafez.files.wordpress.com/2020/11/lenesubumamafutavebujoris.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc1498dc-a0b7-48a2-9530-df67e0e6db0a/wu_client_failed_searching_for_update_with_error_0x8007000e.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_off000058af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x58AF 5748 bytes
SHA-256: da49fe631f655349b2bf7169bb6754fea10e0c840680ce70c62b9a7d0d0cc3d8
font_01_sfnt_off00006c3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C3B 10532 bytes
SHA-256: 6c4c8a8e01438d74d452bf238bcb1ea9b4f945c98fa840a8ecaedc43d32b571d

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