Malicious PDF — malware analysis report

Static analysis result for SHA-256 346b49f5eb20c256…

MALICIOUS

PDF

68.9 KB Created: 2020-11-24 23:13:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9eec2f571e9bd43f1d324dbb6eff05de SHA-1: 77faa0a1e7b1872863aed739c3dac217a873e7fe SHA-256: 346b49f5eb20c2565caac87d150fb3c5faeb21cb1823b2658f7b3081c28b50a6
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files hosted on services like Weebly and Strikingly. One critical heuristic identified links to known malicious redirector infrastructure, specifically 'https://cctraff.ru/123?utm_term=grand+lodge+of+wisconsin'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=grand+lodge+of+wisconsin
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/lotinumedamup.pdf
    • https://firerokuk.weebly.com/uploads/1/3/1/1/131164187/rozibeju.pdf
    • https://gumopukuzi.weebly.com/uploads/1/3/4/4/134481114/5952550.pdf
    • https://noduxureravit.weebly.com/uploads/1/3/4/7/134743755/lojipasusive_zunuso.pdf
    • https://cdn-cms.f-static.net/uploads/4415756/normal_5fa182f3814f9.pdf
    • https://cdn-cms.f-static.net/uploads/4486751/normal_5fbc9ae100b37.pdf
    • https://cdn-cms.f-static.net/uploads/4388041/normal_5fb664bfbf6ca.pdf
    • https://cdn-cms.f-static.net/uploads/4369782/normal_5f8ea8991122b.pdf
    • https://cdn-cms.f-static.net/uploads/4451208/normal_5fa0cb77088fe.pdf
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/kitodobamakumekufa.pdf
    • https://diloxutal.weebly.com/uploads/1/3/4/5/134598378/nijube.pdf
    • https://cdn-cms.f-static.net/uploads/4394071/normal_5faf9baf1b0fa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/535a1a4d-0b42-4940-8cf7-50c307393623/tozigiwufofomazatipu.pdf
    • https://uploads.strikinglycdn.com/files/9979a55c-43e6-4224-9014-d5749b78d80a/32394750303.pdf
    • https://uploads.strikinglycdn.com/files/1275b475-d9a4-4cb3-b58a-e85d02f14d12/jebovutesi.pdf
    • https://uploads.strikinglycdn.com/files/819b41fa-d95b-464f-bb72-455df6951bdc/practice_makes_perfect_english_conversation.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce62.bin
7216ac7228e309e44acf1c3bd26bfbd5996bcac75c9d8884af0bf8b81eb53d8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE62 5312 bytes
font_01_sfnt_off0000e09a.bin
94d0d02a8abe54f5d9a5397be9f518730e7278aaaff65f66c6090cd8e91d7753		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE09A 11868 bytes

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