Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7b4bcdf007d4a7d…

MALICIOUS

PDF

44.8 KB Created: 2020-11-08 04:59:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-15
MD5: 856480445266dc6e60c0c15b4eff679a SHA-1: d5d4eb38e2c138b4061afb55cb9247e10f71f651 SHA-256: e7b4bcdf007d4a7d9f2536123992230cef6d4ba864eee884397605eaf4ce5915
186 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://rumeravovavupol.weebly.com/uploads/1/3/4/6/134619367/617a37c54.pdf.
  • 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/wb?keyword=the%20sims%204%20herbalism%20guide PDF link annotation
    • https://rumeravovavupol.weebly.com/uploads/1/3/4/6/134619367/617a37c54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379374/normal_5f8d575432fee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417818/normal_5fa22d3f3a984.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374024/normal_5f98a872b1e5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393761/normal_5f97cc9de147d.pdfIn PDF document text
    • https://zadumeredevasax.weebly.com/uploads/1/3/1/4/131453870/3a70010dce6.pdfIn PDF document text
    • https://xuzutewoduka.weebly.com/uploads/1/3/4/3/134364923/pusev_kovujepip.pdfIn PDF document text
    • https://nipufijupetobug.weebly.com/uploads/1/3/1/4/131482996/wozazaratobabav.pdfIn PDF document text
    • https://dumunevebule.weebly.com/uploads/1/3/0/8/130874169/pufejogalinane-nefitobivux-rufokosabufuxe-nugopasozegezet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413363/normal_5f9c8c09eb22f.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/20a45b64-d322-4d32-b74e-af36c891a953/70369721481.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4564618-044d-4b17-a4fc-8d048cdd4eb4/11788688648.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/wiwotirevip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fcce431-cfb0-4ac6-a5d6-370af0da1280/ponixitudigeroxugatuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03292fbf-4c98-4de7-ab69-b7ad6f81c9c6/vobavabikanenerupikodadun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2538d94a-c6db-49ca-bb6e-48e677af9ab9/curso_de_guitarra_kiko_loureiro.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_off000071d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71D4 5416 bytes
SHA-256: 9b299d1b4de970c583412d1906c3a1fee2772c2dbd727d2f1feb3acbe0e77aaf
font_01_sfnt_off0000840b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x840B 10060 bytes
SHA-256: 5775f671e65a9ba6f25663977fb114ad1917a2bdafadfdb51ac0179434729b72

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