Malicious PDF — malware analysis report

Static analysis result for SHA-256 dce9ab19d3afca97…

MALICIOUS

PDF

36.4 KB Created: 2020-11-07 14:19:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 09fc4337e80efeea2ef5ef465e3fb237 SHA-1: ca913ca7d8122c2e4e3892ecadac8384bad9f3cf SHA-256: dce9ab19d3afca972911463afe6dcb3d2d3f655911609e1902d5e28e4edc422b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many pointing to disposable hosting services like Weebly, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links suggests it's designed to redirect users to potentially harmful content or further stages of an attack. No scripts were extracted, but the structure and link farm heuristic are strong indicators of malicious intent.

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://trafftec.ru/123?keyword=foto+de+la+bandera+de+california PDF link annotation
    • https://wofenexezut.weebly.com/uploads/1/3/4/3/134310974/bufovixamamokupon.pdfIn PDF document text
    • https://takimibovejexi.weebly.com/uploads/1/3/4/5/134512521/lixomalusogi-jarix-suxupirupapuvaz.pdfIn PDF document text
    • https://gugewixurot.weebly.com/uploads/1/3/4/3/134393699/lupoketo-wuwibag-geguvolelodu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384295/normal_5f93941167f66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380867/normal_5fa5eb715d09f.pdfIn PDF document text
    • https://wilitixovin.weebly.com/uploads/1/3/4/3/134351513/domepuwemoxoxa_bapitozag_jepimedibeta_poxidawuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394082/normal_5fa0fe672a3a1.pdfIn PDF document text
    • https://finiluxexolije.weebly.com/uploads/1/3/1/8/131856594/7041568.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458413/normal_5fa62aae533aa.pdfIn PDF document text
    • https://kusebedanosude.weebly.com/uploads/1/3/1/1/131163667/wexuzerav-bazipexi.pdfIn PDF document text
    • https://jalewigevat.weebly.com/uploads/1/3/2/6/132681207/jokulipakaberadufo.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/70b86a22-56db-4fe9-9421-b39927460e05/supreme_commander_2_revamp_mod.pdfIn PDF document text
    • https://niwafok.files.wordpress.com/2020/11/polar_moment_of_inertia_formula_i_beam.pdfIn PDF document text
    • https://givolajokofe.files.wordpress.com/2020/11/japatewajaliwififu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bad99b7-4b16-4896-adc4-d97bd8a5b735/69136270254.pdfIn PDF document text
    • https://rudasevubut.files.wordpress.com/2020/11/49935091045.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_off00005020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5020 4932 bytes
SHA-256: d17012a8b704797a53ca0dfeb0286e004e1ffd7f34b3f0d11f7094d2a8586d60
font_01_sfnt_off000060f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60F8 10404 bytes
SHA-256: 84b091d2b14ba7db40a8a674fa18fb8ab1ec6358d672cb53e19969ddf70191f2

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