Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9d88ea107667337…

MALICIOUS

PDF

70.6 KB Created: 2020-11-13 15:56:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: c7b59a97ba0e7e8e214700020bb43b1c SHA-1: db6b776806ca283ce7929753e004f2bf7efb30dc SHA-256: d9d88ea10766733745ffb479423d91f44d20d2a2600f971e372eb3550843fcaf
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 0.9997

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://traffset.ru/strik?utm_term=propresenter+6+gr%25C3%25A1tis PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367273/normal_5f8916988fbea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454691/normal_5fade6fa4f4ec.pdfIn PDF document text
    • https://bawebixitowugar.weebly.com/uploads/1/3/4/3/134336924/pedenadoxelamip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405186/normal_5fab882660667.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369916/normal_5f8af4a378fd0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392453/normal_5f8f5b0a3a91a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428035/normal_5f9e0b22137b6.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/gifiz/electrical_cable_insulation_types.pdfIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/43160670329.pdfIn PDF document text
    • https://s3.amazonaws.com/sefipa/41192919195.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/surajutufifipisebak.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/invention_guide_dark_cloud_2.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/discussion_forum_website_templates_free.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_off0000d80d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80D 5136 bytes
SHA-256: 74dfc9041203f62dbf3140d3b58f3fb572692c1aff92d0dbf67c0f91b1363690
font_01_sfnt_off0000e994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE994 10252 bytes
SHA-256: d6501a4f6551f1a48df62328d237579c6fe431a02886cde95735e591dc0b7036

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