Malicious PDF — malware analysis report

Static analysis result for SHA-256 f41e865ebd8fa5cd…

MALICIOUS

PDF

43.1 KB Created: 2020-11-07 03:30:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a409b18ec25df7ff92b73d4c55728aae SHA-1: 4f2c0ef78dff6b6d16a0cebe59bc5c20baa4596c SHA-256: f41e865ebd8fa5cd7ee7210cd571b71f55232bace23fa8e0b5a3363ba3c18d65
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of embedded external links, many hosted on disposable domains, which is characteristic of SEO manipulation or phishing campaigns. The ML classifier strongly indicated maliciousness, and the document body, though heavily obfuscated, contains URLs that align with the link farm heuristic. No scripts were extracted, but the PDF structure itself facilitates the redirection to malicious sites.

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://traffine.ru/123?keyword=unblocked+games+free+games PDF link annotation
    • https://wuvirinofibugiz.weebly.com/uploads/1/3/1/0/131070402/fijuxiwu.pdfIn PDF document text
    • https://nupejaxisolerez.weebly.com/uploads/1/3/4/3/134348845/5636f99.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/tebavu_mofevuz_punoxibera_gijipomole.pdfIn PDF document text
    • https://gopogaxewose.weebly.com/uploads/1/3/4/0/134013169/goduxuvosut-gosavebetezig-zekinokusune.pdfIn PDF document text
    • https://widubemevojapo.weebly.com/uploads/1/3/4/3/134320166/176e6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416789/normal_5fa0f0a42271d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://gefoxuvij.files.wordpress.com/2020/11/mufezajimiwosavo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11aa69b3-8695-4930-8a72-f4a348a81c57/mojejedavod.pdfIn PDF document text
    • https://guzurelezusa.files.wordpress.com/2020/11/69940140599.pdfIn PDF document text
    • https://femawew.files.wordpress.com/2020/11/lebarejezi.pdfIn PDF document text
    • https://raxusurer.files.wordpress.com/2020/11/56959348246.pdfIn PDF document text
    • https://xafatukakafu.files.wordpress.com/2020/11/zeloxofotubada.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_off0000687f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x687F 5536 bytes
SHA-256: b0b017b2772afc868d1726c98af7bbcbaa9fd3286c7b1498e043ff1c970e27c7
font_01_sfnt_off00007b41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B41 10824 bytes
SHA-256: 8936b63487c8d9e608d235a5bf57b84d4ec5f0051f99ede0d0ca06f2b501dd10

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