Malicious PDF — malware analysis report

Static analysis result for SHA-256 59fdda18f495e913…

MALICIOUS

PDF

67.3 KB Created: 2020-11-18 19:09:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 2479f6d79f93c81e26df34a230a61a8b SHA-1: d1cf1ffa408b7c72cf1d594f0034bc05c642bbf0 SHA-256: 59fdda18f495e9132d6e00d02dae357d741184dd6a2e802c9bc0d30ac78c8dec
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 0.9998

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
  • 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://traffine.ru/strik?utm_term=kumihimo+disk+template+diy PDF link annotation
    • https://xoforovujedopod.weebly.com/uploads/1/3/4/5/134587448/jovugipegojol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450428/normal_5fa456236665f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369514/normal_5f8e62d7616dd.pdfIn PDF document text
    • https://firedisivimi.weebly.com/uploads/1/3/0/9/130969818/rexukaxusebo.pdfIn PDF document text
    • https://misopiwulasi.weebly.com/uploads/1/3/1/8/131856666/maretajoson_sepini_mowewu_kurawumep.pdfIn PDF document text
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/85f5a0.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/065192b7-3029-4aa8-86d9-82341a00ddee/minecraft_1.6.4_mods.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3095ab1f-e101-46d1-af78-f531280fa317/batusidokuzilevu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f97295da-d423-4a03-a9e8-64216870bfe2/17153500486.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7818733-5dc3-4695-acb7-b6b23cc0a139/bolipex.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/course_1_chapter_11_statistical_measures_answer_key_page_159.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/gozabenovude.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/062c5dcb-15f0-407c-aeb3-8836e00132db/68599564073.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/best_campfire_songs_country.pdfIn PDF document text
    • https://s3.amazonaws.com/vawoginele/hyo_jin_lee_sjsu.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_off0000cafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFC 5236 bytes
SHA-256: 6299c4ca0206d3ed63866f0b8a1619d43dd8b51177ca036335aef0e0113c3657
font_01_sfnt_off0000dcb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB0 10448 bytes
SHA-256: 36fdf5e3dd4ee56f6977d027b9d21e8474ddb259d9b133723419b653e1e1ed98

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