Malicious PDF — malware analysis report

Static analysis result for SHA-256 13a00b7d24511960…

MALICIOUS

PDF

72.9 KB Created: 2021-02-16 05:37:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 23814aa9dbc7134e3a4828971912c219 SHA-1: 7dc0e6f37a94fc0064457c4d6f92575f415231d7 SHA-256: 13a00b7d2451196064781763ab11c7ac6aa9a7e5c1465e8307a741decf874641
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The presence of external URIs and the structure suggest an attempt to redirect users to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/strik?utm_term=aprendiendo+ingles+desde+cero+gratis PDF link annotation
    • http://tudetiva.iblogger.org/zelivuperu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449769/normal_5ffc2bad18505.pdfIn PDF document text
    • https://norofuzalugegok.weebly.com/uploads/1/3/4/8/134882219/xomanukef.pdfIn PDF document text
    • https://dasatupulike.weebly.com/uploads/1/3/4/1/134131314/7c04742c4.pdfIn PDF document text
    • http://jotewelife.iblogger.org/malakixozenisejeja.pdfIn PDF document text
    • https://kabudinikibe.weebly.com/uploads/1/3/4/7/134716255/1338735.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492275/normal_5ff2ab8a6bc22.pdfIn PDF document text
    • http://nizozipup.22web.org/gmail_email_as_attachment.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/timeziso/tobemifudak.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/kulavipebupavuziruxos.pdfIn PDF document text
    • http://bonizeza.epizy.com/chargers_uniform_schedule_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/kavugusepe/fopuwekukurenagunufaxug.pdfIn PDF document text
    • http://gudoxigamodire.rf.gd/jajadex.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_off0000def2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF2 5232 bytes
SHA-256: 3a7998e5c467c6c0faf47d5d89444f181a8da752e120771737c0bb9ac78dcc09
font_01_sfnt_off0000f0d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D0 11236 bytes
SHA-256: aa9be7fc853e22c319790a026ad3105b244b97061b09437e8980031d1d3947c6

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