Malicious PDF — malware analysis report

Static analysis result for SHA-256 3baa3cd16bfa2c14…

MALICIOUS

PDF

89.3 KB Created: 2021-05-07 23:42:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: ff151b39ae8c2ca7cb71437b9e571ad7 SHA-1: 98e193c0f0a4efa29c74d60be93954ca614134e0 SHA-256: 3baa3cd16bfa2c142c799eb8f86489ded4e92b9f67e258b7cbf792c075113ae1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and extensive link farm suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/strik?utm_term=dish+wally+wi-fi+usb+adapter PDF link annotation
    • https://fofapisobav.weebly.com/uploads/1/3/4/7/134712410/ef5e6.pdfIn PDF document text
    • https://tatazopizen.weebly.com/uploads/1/3/1/1/131163492/bakomom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470221/normal_60206197c8ef7.pdfIn PDF document text
    • https://lixavoje.weebly.com/uploads/1/3/0/9/130969842/7692528.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368989/normal_604f038d17dbd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369331/normal_602a04b9dc3b3.pdfIn PDF document text
    • https://nofuxufemi.weebly.com/uploads/1/3/2/6/132681390/4534995.pdfIn PDF document text
    • http://vudifabofugejij.medianewsonline.com/45139262763.pdfIn PDF document text
    • http://galufixagomedo.getenjoyment.net/soil_biota.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418166/normal_6019ba9168980.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444852/normal_603ea04fd5c19.pdfIn PDF document text
    • https://sibuvavaxo.weebly.com/uploads/1/3/2/6/132681946/bejonewed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474734/normal_600ce523b4c1e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445735/normal_5ff13efd30b49.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484376/normal_5fdf1f9a3ce89.pdfIn PDF document text
    • https://levarimabogi.weebly.com/uploads/1/3/5/3/135328943/tufaxonivu_valejoburijuk.pdfIn PDF document text
    • http://virivuluk.getenjoyment.net/drinking_alcoholic_beverages.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386094/normal_6018df51aa28f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456166/normal_5ff4fd8496432.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://safedoguno.onlinewebshop.net/cardiopathies_congnitales_non_cyanognes.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_off00011c32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C32 5496 bytes
SHA-256: 25b6a0b83c2ec44ea381a2914d5ecc35b72e38accc0b7da578388f3efbcfc3dd
font_01_sfnt_off00012f00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F00 12048 bytes
SHA-256: 21e25367d8aa4671941ac0ade49a52cbee33e360e19b7380f949145ff4b6a90d

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