Malicious PDF — malware analysis report

Static analysis result for SHA-256 0102fcc866ce722a…

MALICIOUS

PDF

73.6 KB Created: 2021-01-06 08:56:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 6fea76a9e5fc11b7d2c78e23bd70699d SHA-1: 832d20666a48cc77edf8a010679761e2a52489fc SHA-256: 0102fcc866ce722a48a7bb9e74e3ef0030020ef35b0c60c3a6b97c217a3ff626
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://trafficel.ru/123?utm_term=adaptive+autosar+logo PDF link annotation
    • https://xeruterone.weebly.com/uploads/1/3/2/6/132680908/kabuletolexu_lonotemuwuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387711/normal_5f95a25362675.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393034/normal_5fb52d173a4d3.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/rejiner/excel_frequency_table_template.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/xadunusu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0e7db2c-ebb0-4144-9cff-b414950a4bb0/sotasegiwop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d21d8fc4-b507-4a8a-ae86-0aa1d1daaa62/mafakezem.pdfIn PDF document text
    • https://s3.amazonaws.com/bofake/code_collaborator_review_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc8e6466-e762-4a44-8343-d630fafb524e/62947867800.pdfIn PDF document text
    • https://s3.amazonaws.com/vinejivunitego/english_reading_exercises_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/390353dd-8591-4a87-af50-d6ee9d1ff2e1/blackstone_pizza_recipe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c30c30b-3ccc-4116-b520-9a5596712bb2/500_calorie_diet_plan_meals.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/681d6b9e-3b33-46d2-9546-c35641e3eecb/finakiwajavonojerudes.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_off0000e352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE352 5176 bytes
SHA-256: b0a34472291ad84fc0246786d9e53af90ec4852d0dc5157804f656230a4a4f73
font_01_sfnt_off0000f506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF506 10788 bytes
SHA-256: c5d42ad6debf52d5c29b8800a1e541046e9ad95370e5ec9eb1bf250dc09135f9

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