Malicious PDF — malware analysis report

Static analysis result for SHA-256 81204ebebb9d5793…

MALICIOUS

PDF

36.3 KB Created: 2020-11-06 01:19:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-11
MD5: d9423f258de2d78a14c0bbd50d9f737c SHA-1: 68052350e2afe0bd3c013d2f8030d51b73f145d3 SHA-256: 81204ebebb9d579379a923d3fb5b5f70a565ba29b8e475ebb366846a0d6512d8
126 Risk Score

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://trafficel.ru/aws?keyword=math+1014+virginia+tech PDF link annotation
    • https://pisekubil.weebly.com/uploads/1/3/4/3/134322001/74bfb.pdfIn PDF document text
    • https://ditiwudo.weebly.com/uploads/1/3/1/4/131452947/pekewu-pedufajib-beloduleduzezo.pdfIn PDF document text
    • https://porelananov.weebly.com/uploads/1/3/0/7/130775759/3113240.pdfIn PDF document text
    • https://xaweworamek.weebly.com/uploads/1/3/4/6/134610398/9915295.pdfIn PDF document text
    • https://filafibiwi.weebly.com/uploads/1/3/4/3/134316544/7eae2.pdfIn PDF document text
    • https://rokumetusemep.weebly.com/uploads/1/3/4/3/134382705/844082.pdfIn PDF document text
    • https://dirigesibujov.weebly.com/uploads/1/3/0/9/130969991/9179088.pdfIn PDF document text
    • https://norajinojo.weebly.com/uploads/1/3/4/3/134381333/logoraj.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/pamilezazarejifa.pdfIn PDF document text
    • https://jewadasin.weebly.com/uploads/1/3/4/6/134604584/bojaxodekiboki.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/viromibukoleliw/nezegixipowubunivuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13404619-c8d3-4738-a2f0-fe0ffd80c41f/vosutuzikoziveleturazizik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef4bb058-2f2c-47b9-948f-a5a6c5fa13e1/23660019793.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_off00004e60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E60 5196 bytes
SHA-256: e4bf13e3494f8d55db6253da89f07d36176f5473927c6c6569203294484f26ca
font_01_sfnt_off0000602e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x602E 10756 bytes
SHA-256: f3a5dfcc9db5efa4f11e774a9cf872486cb8f31d5b6d7a59425d074fa6ca6176

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