Malicious PDF — malware analysis report

Static analysis result for SHA-256 23ba033002127daa…

MALICIOUS

PDF

87.7 KB Created: 2021-02-22 11:06:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a1dfa1dfbe084d384b9ba8bf4c92d220 SHA-1: 01f5c4f1f06923b88222cbd9e249e4414761b807 SHA-256: 23ba033002127daa95fd3e49433acd6c54b0571b5e09a81b8449f7ac8e3157bc
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://seumenha.ru/123?utm_term=change+is+gonna+come+lyrics+meaning PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380682/normal_60331ca356d3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393193/normal_602115ab23b99.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418368/normal_5fcda63a54c51.pdfIn PDF document text
    • https://pimujupaz.weebly.com/uploads/1/3/4/4/134440235/wokitox.pdfIn PDF document text
    • https://cdn.sqhk.co/posiraki/eVjjhjg/the_trip_to_greece_review.pdfIn PDF document text
    • https://wepidunobon.weebly.com/uploads/1/3/1/4/131452842/f94bdc5a2e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420939/normal_602e0f36e0bc5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461748/normal_5fe55b4961038.pdfIn PDF document text
    • https://cdn.sqhk.co/tudusiki/hfMcWAn/89738790866.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461516/normal_600b4b863c554.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423188/normal_5fc8f0ff18d8f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443326/normal_6005f4ea12a12.pdfIn PDF document text
    • https://luwinititik.weebly.com/uploads/1/3/4/5/134587042/wuzofutapuzubexol.pdfIn PDF document text
    • https://gomafaned.weebly.com/uploads/1/3/5/2/135296522/9463148.pdfIn PDF document text
    • https://cdn.sqhk.co/gadujotev/ijiguCV/voziroxonidejevar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379483/normal_6031f9c5bfb73.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476285/normal_6006ba557fbcc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388048/normal_6017b38bee152.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503214/normal_60219e565c733.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000116d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D6 5220 bytes
SHA-256: ccc4d3a13191c111ffcf9f8a141289811143c5e81eec5d2c8e4daaf518655a50
font_01_sfnt_off00012875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12875 11840 bytes
SHA-256: 48679901ead8eb66e8042fb4c97e91fce0b81c48a94696c9c0f30713809d4167

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