Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd44ca192afe4c4e…

MALICIOUS

PDF

59.1 KB Created: 2020-11-22 03:08:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: d99d493a9ae8eadf39362bfd90caafe2 SHA-1: 2ad155e662be1b61387b15684bb8fcbe11bd487b SHA-256: cd44ca192afe4c4e22a7472f9dff5b1a625f8571615954f6483b45054c589a2d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which are to other PDFs, suggesting a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafficel.ru/123?utm_term=us+history+benchmark+test+1+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4496592/normal_5fb665211215f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454665/normal_5fb668d9ddb20.pdfIn PDF document text
    • https://kezojafedekekav.weebly.com/uploads/1/3/4/0/134096401/bopuzusepof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370285/normal_5f8b5fb523d48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369783/normal_5faab87669900.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393641/normal_5f94eabca8b2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372361/normal_5f9af42ccf552.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420934/normal_5fad8cecabc5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410448/normal_5f99986972c08.pdfIn PDF document text
    • https://faremuxonebaw.weebly.com/uploads/1/3/4/5/134598019/3079801.pdfIn PDF document text
    • https://mesirurot.weebly.com/uploads/1/3/4/7/134706751/35ca330d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365649/normal_5fb80d8f43ff1.pdfIn PDF document text
    • https://kisotupojez.weebly.com/uploads/1/3/4/4/134493444/fewev_nawadofaxusi_lifezamego.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382194/normal_5f926cb379426.pdfIn PDF document text
    • https://donokodupotev.weebly.com/uploads/1/3/4/3/134317189/wugakonagedez-zubove-tubito.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/0a596849-ef74-4d60-8667-bf0f5660f7d9/free_robux_copy_and_paste.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02fc4372-d3bc-4eff-9b2d-a36aa718dc6b/cours_introduction_au_droit.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_off0000ae75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE75 5448 bytes
SHA-256: 6464ff1b4d237d854f1217ce67463918dff7292b69b572cd78672c9264ca5d2f
font_01_sfnt_off0000c0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0EE 9220 bytes
SHA-256: 0787da4a87626981e07b6af653d16374c90a2471eafbe917c8334cf7128a713c

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