Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecc03e9ca753de18…

MALICIOUS

PDF

79.5 KB Created: 2020-12-21 03:19:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: c265b782b2943be0ae809ca3ecd0b676 SHA-1: b5e5a0d3240bb68d5839b64fdb6db1b087dfb86e SHA-256: ecc03e9ca753de1823f2e8f9a1395b7cc13486f58f6c569622336a24b92c2d93
214 Risk Score

Malware Insights

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

The PDF contains multiple links to external websites, including a known malicious redirector and a link farm, suggesting an attempt to direct users to malicious content. The ClamAV detection and ML classifier further support its malicious nature. The document body, though heavily obfuscated, appears to be a lure related to academic material.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/123?utm_term=understanding+earth+8th+edition+pdf In PDF document text
    • https://talapilodegopez.weebly.com/uploads/1/3/0/9/130969507/9944730.pdfIn PDF document text
    • https://mojipolizu.weebly.com/uploads/1/3/4/3/134318612/lumaxubixuxub.pdfIn PDF document text
    • https://fejomuzuzozasas.weebly.com/uploads/1/3/4/7/134748710/789511.pdfIn PDF document text
    • https://xofokoraziv.weebly.com/uploads/1/3/4/7/134748977/4cbf026b8b67109.pdfIn PDF document text
    • https://jiwuzutobaduf.weebly.com/uploads/1/3/4/8/134889186/4112714.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/solazobezijupetasazuxulu.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/biographical_sketch_template_for_students.pdfIn PDF document text
    • https://s3.amazonaws.com/tosego/boot_camp_assistant_for_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/industria_alimentaria_tecnologias_emergentes.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd3fbc0060721f2ab9701e/1606238141326/gipupuvilizetunaven.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_off0000ea9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9D 5456 bytes
SHA-256: a7c0e566a87962c488831bbc34b3bda23a197c562d3202637be2c2103f61925b
font_01_sfnt_off0000fd23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD23 2664 bytes
SHA-256: e0ebb5efa9e64d119452cf3936d43c33b78e9d28f006e686d2dfc391e09a1b01
font_02_sfnt_off0001086f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086F 12452 bytes
SHA-256: 0db79aff75010d6202989dc47386c2d917421e83611b9647e08abce2f564eef1

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