Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c9bd0d1eb7bc235…

MALICIOUS

PDF

96.3 KB Created: 2021-01-08 05:15:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: eef2356665811ddb0a619307ba6edd68 SHA-1: 6e4f340d53412db1850e64df417801cda67cb911 SHA-256: 3c9bd0d1eb7bc235d2be68f3871fc4097a7ebb3682eeeed9cda0edbd1ed2eaa9
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect the user to a malicious site, potentially for credential harvesting or further payload download.

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://traffine.ru/123?utm_term=netflix+case+study+2018 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481509/normal_5faef5357502a.pdfIn PDF document text
    • https://losuwasujiro.weebly.com/uploads/1/3/1/6/131637226/4538379.pdfIn PDF document text
    • https://lopuxewununoj.weebly.com/uploads/1/3/4/7/134748711/506b1d8c2b5.pdfIn PDF document text
    • https://mizunemaki.weebly.com/uploads/1/3/4/8/134850414/9f32ecca5c3ecc.pdfIn PDF document text
    • https://kewusubeve.weebly.com/uploads/1/3/4/5/134515363/fafebevow_veweparavorif.pdfIn PDF document text
    • https://gumelajijepepa.weebly.com/uploads/1/3/4/6/134639918/6220007.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423699/normal_5fa190dba23b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453747/normal_5fa5ae7769cc3.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/lukepepe/solving_proportions_maze_a_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/goviwigax/84846401209.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2e4e427-84e7-464b-962c-5a2f76e47c55/important_figures_in_the_trojan_war.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebc38c88-f480-4e2b-bfc0-6f077a04ffd1/mofubilifanapexuner.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_off00013956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13956 5580 bytes
SHA-256: ab3d802e887b14e042d89da04400663083a9c6a1aba10a95b03f6f3cf87b89c7
font_01_sfnt_off00014c87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C87 11660 bytes
SHA-256: 162a65a641e10ff33dfed2e397aa9b94d65e89433957c8d47f6e626903981de2

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