PDF malware analysis — malicious · c33bbe25dc63a9fa

MALICIOUS

PDF

74.9 KB Created: 2020-11-23 06:45:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27

MD5: 83d31c332ca7e062eb4f1b4489ea0e58 SHA-1: 5e2257cab7676f9d35bb63bd1688c07eb1b83d96 SHA-256: c33bbe25dc63a9fa633a99d955e1cb36ad455924159501683ef78c1559c7cd54

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF document that contains an embedded URI pointing to a suspicious domain, identified as malicious by ClamAV and an ML classifier. The document body, though heavily obfuscated, suggests a report, likely a lure to encourage clicking the malicious link. No scripts were extracted, but the presence of the external URI is a strong indicator of a phishing attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 4

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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://traffnew.ru/aws?utm_term=grain+size+distribution+test+report PDF link annotation
- https://cdn-cms.f-static.net/uploads/4470542/normal_5fadb3c463f79.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4366340/normal_5fa247d23f086.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4426972/normal_5fab0c57270aa.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4368996/normal_5fa75f67ccf70.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4454420/normal_5fb49f0a8ef9c.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4465564/normal_5fa64806ab2c0.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4365638/normal_5f8710d036bcb.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/sezebepit/tajesijuribow.pdfIn PDF document text
- https://s3.amazonaws.com/devuxuzejozam/bexaxone.pdfIn PDF document text
- https://s3.amazonaws.com/napisakaluja/chemquest_23_answer_key.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/9e44bdca-1f73-481d-9268-4b343cdae43b/majibobagadunex.pdfIn PDF document text
- https://s3.amazonaws.com/webipejonavuv/catalogo_bticino_living_now.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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e68d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE68D	5140 bytes
SHA-256: `d6cb6f32449a919ac86d51f14f9ec623222bf750e390087f4272043381fff238`
`font_01_sfnt_off0000f819.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF819	11276 bytes
SHA-256: `84cd73bf5c82b498a4e3cd4d7d30b878fbfee2d700c9104813edf57f497e449d`

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