Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba99f12e7cd40ec9…

MALICIOUS

PDF

40.5 KB Created: 2020-11-08 01:19:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 42c08827e37821b37b56d1ac9d0f9074 SHA-1: 23827365d8d164a7f4d8d580a745c370150f85f8 SHA-256: ba99f12e7cd40ec992f8fc3307337bc6affa951e052b57825d2d0fdb3ddc2a6c
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://traffking.ru/123?keyword=alex+clarke+death PDF link annotation
    • https://nulixedupalaz.weebly.com/uploads/1/3/0/7/130739510/a2ad95138b21b.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/sixukejomiwewanage.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368770/normal_5f8ab2a78aac3.pdfIn PDF document text
    • https://zafojepomekosax.weebly.com/uploads/1/3/4/3/134352399/pagerigojap_kotuduwokev_wasixamufuzez_meziwotujataz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365546/normal_5f8da93c81d51.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/mikukinib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375352/normal_5f8a9ba8b8235.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422909/normal_5f98ad7ed8d68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388048/normal_5f98da2142fae.pdfIn PDF document text
    • https://vodiwisilob.weebly.com/uploads/1/3/2/6/132681054/0c7c961960e5.pdfIn PDF document text
    • https://gegakavawedo.weebly.com/uploads/1/3/4/2/134265750/5320126.pdfIn PDF document text
    • https://pazolumaf.weebly.com/uploads/1/3/4/3/134356568/c993d251fd3.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/wonoti/maths_book_class_10_in_english.pdfIn PDF document text
    • https://sidulemova.files.wordpress.com/2020/11/tojakabozemoxujinalagave.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/73964307420.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_off00005f8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F8A 4972 bytes
SHA-256: d17ef65508883a64c289ec70cf8cdb81be12d89bc720d1e878d8b522c963d1f9
font_01_sfnt_off00007071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7071 10884 bytes
SHA-256: 934d0bb2bb5a4fd56cf8b9103499d788a278065f89b0ab18293ef1d063cb5b02

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