Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f7539648f48b83b…

MALICIOUS

PDF

60.8 KB Created: 2020-11-18 05:59:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 01fff6cda40d7360e93f183182c894b0 SHA-1: 937eadc9828e5d7b0767fd9f9b38aa4ddfea5a44 SHA-256: 3f7539648f48b83b4647b5cbe3043c3cb58614a9d31020b72213f19e0710f5ec
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/strik?utm_term=descargar+castlevania+aria+of+sorrow+espa%25C3%25B1ol+gba+rom In PDF document text
    • https://cdn-cms.f-static.net/uploads/4466146/normal_5fa3e8a3929ef.pdfIn PDF document text
    • https://jikevumuvovidu.weebly.com/uploads/1/3/4/3/134324483/vemeno-zemobos-zoruw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365536/normal_5f8c741b7772d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380674/normal_5f9bb81fd9465.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/3b066a5b-a8b2-4997-9e82-4068bb56ac47/sefizefubara.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/34773402467.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9bdb2f1-c9a1-4ff3-ad49-c6d71857235a/22438986022.pdfIn PDF document text
    • https://s3.amazonaws.com/jofunozuzof/travelling_allowance_form_for_central_government_employees.pdfIn PDF document text
    • https://s3.amazonaws.com/godewumazek/hungry_shark_world_hacked_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/54363547441.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/2067268901.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000acd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACD8 5836 bytes
SHA-256: 24e3ea9f38c6281592052443aa77ac9af270ae694cdaac0f28d8e8fc24b9c6f8
font_01_sfnt_off0000c080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC080 10364 bytes
SHA-256: d543fe718b996eac5177392f99d9b5f2df532e961956c1b22a7e41df10359b8c

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