Malicious PDF — malware analysis report

Static analysis result for SHA-256 914e23909be65c5e…

MALICIOUS

PDF

67.6 KB Created: 2020-12-09 01:55:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 8d8898df3c79ccd0f7264059d7d3e291 SHA-1: 74490d1af8cde50ff9c573d4567599ce03b1d4f7 SHA-256: 914e23909be65c5e8304e9a657e6d22357700429bd40d3e0dcedc38f6898bb73
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 Weebly and other platforms, indicative of a link farm or redirection scheme. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://traffine.ru/strik?utm_term=jeff+davis+county+chamber+of+commerce'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

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
  • 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://traffine.ru/strik?utm_term=jeff+davis+county+chamber+of+commerce In PDF document text
    • https://bubixoduxufito.weebly.com/uploads/1/3/1/0/131070588/movimifatizujil_dimatesagegoja.pdfIn PDF document text
    • https://sesuwulot.weebly.com/uploads/1/3/1/4/131438847/fibexitoma_fixedulodupekam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391302/normal_5fad251ba6b0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366654/normal_5f873d22ebc2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375891/normal_5f96266d96da3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469375/normal_5fad26daea658.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409811/normal_5fc88021c5523.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449009/normal_5fbf14510cf77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369306/normal_5f8b59b6a04be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404287/normal_5fa8a6d782f47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390071/normal_5fa39de4915ea.pdfIn PDF document text
    • https://polatubogo.weebly.com/uploads/1/3/4/5/134598163/jasugobomarotojul.pdfIn PDF document text
    • https://dapevorejux.weebly.com/uploads/1/3/4/6/134695165/tapadubabexukowolewo.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/jaloto/nitusonomadobasuwireraso.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/50825793282.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D1 5520 bytes
SHA-256: 5ba547183a8352006a829c102088f4124b396e7c5357624d8e6bd110a1b80dca
font_01_sfnt_off0000c77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC77C 10916 bytes
SHA-256: b86feee484af7010fd3f290c19120edc37b67fe905b5b34a565bd833c8773688
font_02_sfnt_off0000ec36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC36 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15

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