Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5b272c8dfd200a4…

MALICIOUS

PDF

81.1 KB Created: 2020-11-10 06:40:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 2e2697fb90fed52cc30237a191a8acf7 SHA-1: 90cb8076371b4b48e065edc784e5e52cc98532de SHA-256: f5b272c8dfd200a403ce096a31c85bdb0769e42fedac1b35d0bfa92b78501182
156 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 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.
  • 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://trafficel.ru/strik?keyword=pal+stewie+script PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414678/normal_5f9bbe82d482f.pdfIn PDF document text
    • https://rizadubarezesul.weebly.com/uploads/1/3/4/4/134499036/towerajiva.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/6db84487-fed3-4192-b99c-ef073cabbb69/untold_scandal_2003.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ddb5bbf-6d67-491b-9f3e-f9fdf040fc50/nude_swimming_male.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ab8879b-95a5-4c06-8d7c-ccf72a74a55d/fomugibesemovig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/053aae1c-fe9e-43e5-86d2-80645f7fe353/botigazenetezuxedawaxu.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/innova_3120_manual_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ef943c9-9da7-4714-8de2-7c55f47638a1/cox_tv_guide_for_henderson_nv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6d684fc-a603-4da6-92ea-cedbb6c2a8d4/30337436170.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff7ccf92-d0c1-4f6c-aad8-1dcf1cf442e7/44142013346.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF519 4592 bytes
SHA-256: 2756c79b5351948f1263a27695174ac8953502eac5de047c5a5f11c19a96a15c
font_01_sfnt_off000104cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CC 11084 bytes
SHA-256: c4b15b4ba0dfb0d475654c705beba818b074a36e63a7b1d69af6c54b9ec77498
font_02_sfnt_off00012a43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A43 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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