Malicious PDF — malware analysis report

Static analysis result for SHA-256 c63a148cc6260a80…

MALICIOUS

PDF

77.8 KB Created: 2020-11-25 07:45:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 1a7c8252b7381cc544daae56c0e7e9e2 SHA-1: 9a7795369daab3a3f75d5dd0f92fda723141284b SHA-256: c63a148cc6260a80f3ebed91cc4023b3b60df6f086b414f41ceadb6883a83e87
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The document contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or redirection scheme. The presence of 'utm_term=girl+scouts+of+greater+los+angeles' in one of the URLs indicates a lure to attract victims. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs strongly suggest it is designed to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffe.ru/123?utm_term=girl+scouts+of+greater+los+angeles PDF link annotation
    • https://tonurokekar.weebly.com/uploads/1/3/4/4/134456200/6cb68e4c681.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385410/normal_5f925e91a673a.pdfIn PDF document text
    • https://loroxiboziniluz.weebly.com/uploads/1/3/4/4/134402159/vudadadotojada_bodapimigu_rotumimunaw_rivifuga.pdfIn PDF document text
    • https://besogedawifajop.weebly.com/uploads/1/3/4/2/134234635/vexutavotepodavibaw.pdfIn PDF document text
    • https://mufedagejex.weebly.com/uploads/1/3/4/7/134726032/3d21f99.pdfIn PDF document text
    • https://dojumavuj.weebly.com/uploads/1/3/3/9/133997280/fafox-lurazirobap-tutonibojeduk-bikafojafabu.pdfIn PDF document text
    • https://wajajudamivigo.weebly.com/uploads/1/3/4/3/134359543/6856862.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/eae23f57-f405-4433-9e24-389429fac7b1/5098771681.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc349fee-361b-44e8-ae26-5e0993155b34/fumuferapowagidaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09808cbd-c6eb-4c48-a6cd-540cc271e52d/palibugotadesej.pdfIn PDF document text
    • https://s3.amazonaws.com/mozirolinitaje/railcraft_manual_rolling_machine.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_off0000f485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF485 5080 bytes
SHA-256: e2eeedd5d5583f358a04c988156c95e958ec98af6b5f63817a7a9986b910bd5d
font_01_sfnt_off000105e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E3 11052 bytes
SHA-256: b159de812cd7619443a1452839101124fb2dc5271db0f5b21d1c23186e3de039

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