Malicious PDF — malware analysis report

Static analysis result for SHA-256 4693f36c71aec0c3…

MALICIOUS

PDF

81.7 KB Created: 2021-02-16 23:05:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4bd49f2a0de4e013aa81e6fecc4b75dd SHA-1: 037ab0d1ae555f585d61307955ec6831c24904d3 SHA-256: 4693f36c71aec0c338969740c71d69b8b8ec9dab3ec4dce6f878ec92f6b18f42
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded content, though heavily obfuscated, likely serves to redirect users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://baarspo.ru/strik?utm_term=rosario+de+las+l%25C3%25A1grimas+de+mar%25C3%25ADa+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485823/normal_600aa04ab603f.pdfIn PDF document text
    • https://cdn.sqhk.co/susononuz/hjhcjad/91836170036.pdfIn PDF document text
    • https://lolifibek.weebly.com/uploads/1/3/4/6/134634661/2563336.pdfIn PDF document text
    • https://tudaluvakagovax.weebly.com/uploads/1/3/4/6/134614365/tajuwisiwa.pdfIn PDF document text
    • https://cdn.sqhk.co/xonudutixova/Ujgjcjh/legal_administrative_assistant_jobs_near_me.pdfIn PDF document text
    • http://getsol.xyz/excursion_report_examplekerlm.pdfIn PDF document text
    • http://mazers.fun/increase_in_blood_pressure_in_pregnancy_guidelineszim8x.pdfIn PDF document text
    • https://faxomozux.weebly.com/uploads/1/3/0/7/130775398/5e98d5d39a7.pdfIn PDF document text
    • https://cdn.sqhk.co/kinemefuwa/iidTqgd/hell_s_kitchen_match_and_design_cheats.pdfIn PDF document text
    • https://mujolimu.weebly.com/uploads/1/3/4/8/134868529/gemamenukefuga.pdfIn PDF document text
    • https://demuxovepeb.weebly.com/uploads/1/3/4/3/134311881/jufuko_fuvem.pdfIn PDF document text
    • http://geleostone.online/pdf_ausfllen_erstellenodt56.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ff3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3D 5656 bytes
SHA-256: 541ce0df04a8c9a662cb0dcebc2b70e76ca4c8921ac41ebfe22cc67436d5a0a7
font_01_sfnt_off000111d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D9 11768 bytes
SHA-256: e0ad4cbdb5e7d28cc53028f2d34a2954e213130bdc65dab972daa1f92894f940

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