Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf636b19b4592ac0…

MALICIOUS

PDF

46.5 KB Created: 2020-11-08 17:25:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b0bdfc858655634fdf4fcd439eeda79f SHA-1: d8203b19528f93b7ba9210acd9b74fe57d230249 SHA-256: cf636b19b4592ac0f1b9a85b77c27db8260028edacec1e1e5e361984becc7b04
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://trafffi.ru/123?keyword=naruto+shippuden+episode+143+english+dubbed PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366047/normal_5f8e32e02fc6d.pdfIn PDF document text
    • https://zegojipoxe.weebly.com/uploads/1/3/1/0/131069766/9249183.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366347/normal_5f8a15553d5d2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://fefitaw.files.wordpress.com/2020/11/64939725781.pdfIn PDF document text
    • https://wotenopofe.files.wordpress.com/2020/11/budixaw.pdfIn PDF document text
    • https://zenomanotape.files.wordpress.com/2020/11/peter_weiss_the_investigation.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/daily_paragraph_editing_grade_7.pdfIn PDF document text
    • https://mefutaveve.files.wordpress.com/2020/11/vedaf.pdfIn PDF document text
    • https://podawigiwoko.files.wordpress.com/2020/11/operaciones_con_numeros_enteros_1_eso.pdfIn PDF document text
    • https://vadazigifexe.files.wordpress.com/2020/11/gopiv.pdfIn PDF document text
    • https://s3.amazonaws.com/tobojelusiwi/adjustable_dress_form_large.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/92732170915.pdfIn PDF document text
    • https://wiligudunu.files.wordpress.com/2020/11/nelson_textbook_answers_grade_7.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/algorithms_4th_edition_4th_edition_by_robert_sedgewick.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006bdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BDD 5516 bytes
SHA-256: 8f874e919a674e626ddf2935dcd67e2b5492e2f3f13b01083e138865f2d554fc
font_01_sfnt_off00007e99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E99 9288 bytes
SHA-256: 791a971d6cd7ff95e2cebb9a25bde6c060385a2a16755d4306a5c1fe5fd85221
font_02_sfnt_off00009e65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9E65 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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