Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f212241e8d3e255…

MALICIOUS

PDF

74.4 KB Created: 2021-01-17 14:29:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: c9a2210caacab3e2ebe079ecfad84fd0 SHA-1: 976a397597467dbcd3acf377727552190bf362a8 SHA-256: 1f212241e8d3e255294bd39bba10f7f7eda18c17642e16e67da57bcafb6b41e0
164 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 pointing to S3 buckets, which is characteristic of SEO link farming or content distribution networks for malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/aws?utm_term=verb+to+be+practice+worksheets+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449014/normal_5faa03baa2a62.pdfIn PDF document text
    • https://site-1171695.mozfiles.com/files/1171695/rush_limbaugh_podcast_youtube_september_25_2020.pdfIn PDF document text
    • https://site-1177663.mozfiles.com/files/1177663/siwoladefiwes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366324/normal_5f87715db4954.pdfIn PDF document text
    • https://bemetezebore.weebly.com/uploads/1/3/4/8/134882820/0218868d694b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413867/normal_5f9a8fc210ad3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368489/normal_5fc5fa8ce30e9.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/xabalaru/digestive_system_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/47414475298.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/23184611316.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/forms_of_energy_worksheet_grade_5.pdfIn PDF document text
    • https://s3.amazonaws.com/makumapikeze/kojedikoxifetakomufed.pdfIn PDF document text
    • https://s3.amazonaws.com/tinivukedeta/rcm_music_bhojpuri_video_2019_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/tupofelasujewas/38155656558.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/christmas_images_jesus.pdfIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/milestone_chalkboard_template.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_off0000e1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B2 5472 bytes
SHA-256: 264fff93551c54822ca20784397dc4d04f97cfd9605bd2ba8e154f778bc45f78
font_01_sfnt_off0000f45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45B 11520 bytes
SHA-256: 5f8cdeb04c6744454ec231f24cc91401eea40634efe63e6f38ad5455a4e1e3e3

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