Malicious PDF — malware analysis report

Static analysis result for SHA-256 93ca5d6561465976…

MALICIOUS

PDF

103.8 KB Created: 2021-01-15 10:58:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: e77b25a5cbb490c335c0fc5a27fa4a4f SHA-1: e95acb6034e36bb27dd15e5dd1ab7b872d85c757 SHA-256: 93ca5d656146597654ad3344d2977efe8aa900f6e5d14a6970829e68f69fd94c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links pointing to external websites, with one heuristic specifically identifying it as a link farm on disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/123?utm_term=eastern+timber+wolf+habitat PDF link annotation
    • https://site-1175017.mozfiles.com/files/1175017/1665428451.pdfIn PDF document text
    • https://site-1175951.mozfiles.com/files/1175951/fibagezugox.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410431/normal_600027040616f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475397/normal_5fd70fbd25761.pdfIn PDF document text
    • https://toripifisesu.weebly.com/uploads/1/3/4/3/134367164/3494314.pdfIn PDF document text
    • https://levevuwakute.weebly.com/uploads/1/3/4/9/134904524/ribesirowipazewupir.pdfIn PDF document text
    • https://site-1176145.mozfiles.com/files/1176145/free_music_apps_for_android_offline.pdfIn PDF document text
    • https://site-1204337.mozfiles.com/files/1204337/banometezovewixekuvi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384145/normal_5ff473f74b0c8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449779/normal_5ff236c429f0f.pdfIn PDF document text
    • https://site-1195137.mozfiles.com/files/1195137/chatous_video_not_working.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426422/normal_5faae7e18cec4.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/lonozote/abbyy_eformfiller_free.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_off00015834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15834 5196 bytes
SHA-256: 79550abf2fa8eeff7f48abf13448e49537772a25c1a94650e9f1836f6d972509
font_01_sfnt_off000169c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169C7 12252 bytes
SHA-256: 8457921c7e0d44368d5cc6b5e40264f620eb15bbf9abd7c33cd977ae938db4c3

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