Malicious PDF — malware analysis report

Static analysis result for SHA-256 24cf20f41360829c…

MALICIOUS

PDF

79.3 KB Created: 2020-11-13 04:16:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 4d1848b771b134337078264dca023505 SHA-1: bbf4303bec6e2de60de2fd361dab5f77835a7474 SHA-256: 24cf20f41360829c213feb375efe419d36450352b82e1f8d9f64a713ea98b514
186 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 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?utm_term=virtue+and+vice+fear+and+loathing+in PDF link annotation
    • https://pidadilux.weebly.com/uploads/1/3/4/6/134666204/bazarerin-surilugajexu-jusibut-jopaxig.pdfIn PDF document text
    • https://xotuwajugi.weebly.com/uploads/1/3/4/3/134349857/mejelifonid-fovokula-jutuviv-weximetur.pdfIn PDF document text
    • https://likiroji.weebly.com/uploads/1/3/4/5/134526819/115d684fbe4e.pdfIn PDF document text
    • https://murikupa.weebly.com/uploads/1/3/4/4/134481598/rezirab.pdfIn PDF document text
    • https://mitixofixomu.weebly.com/uploads/1/3/4/3/134333727/3315224.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393204/normal_5f8e6a2091143.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408323/normal_5f9a5eadeb325.pdfIn PDF document text
    • https://pamuvomamutafa.weebly.com/uploads/1/3/4/3/134305197/ea929.pdfIn PDF document text
    • https://jijalasigode.weebly.com/uploads/1/3/4/3/134344414/rupulirizadapub.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/dfd76823-bc95-4ac9-8942-9db6cbfeb376/xoxenebopidovolaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/238135e6-310b-417b-8c21-291be00c6d4d/vowetijewamoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b27f7e2e-6181-4546-b51c-16cb94c8aa32/lisabeluzu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d480f455-1a48-4900-a644-cda679da3dfd/bezuwep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fd03651-80f3-4e85-972a-951f9f16b71a/sufes.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4F 6456 bytes
SHA-256: fbf724b59b1faf71c8f7cf46a52450f2423fc5aa1c4b64a3c0bc820bc83ab669
font_01_sfnt_off0000e36d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36D 5128 bytes
SHA-256: 5c70ae36a0d8e153d60b675717efe0ef1e9550c69a68cfcd2202a7fbf5f3d1a3
font_02_sfnt_off0000f4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EB 10444 bytes
SHA-256: 41215730911ed907f0abfdbe6e940ff5e8b8f3775a01c1304ba8d87d0237b0f0
font_03_sfnt_off000118f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F8 16104 bytes
SHA-256: a2ae3ae010fc9d233b854917841a89f72dd7fdf4cd45890bb076eddb464b4872

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