Malicious PDF — malware analysis report

Static analysis result for SHA-256 53af90eeeb848734…

MALICIOUS

PDF

75.1 KB Created: 2020-11-18 09:14:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 6bfe1de64b373472cce9876d7aabe1d7 SHA-1: 97b5344cf6fd01e2d4ccaf00d2c6154d4a76589c SHA-256: 53af90eeeb8487344cbacceaebfce73e203cae2b31e8e7e327dbf8b6df152c20
96 Risk Score

Malware Insights

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

The file is a PDF containing an embedded URL that points to a suspicious domain, identified as malicious by ClamAV and an ML classifier. The PDF's structure and content suggest it's designed to trick users into visiting the external link, which is a common tactic for phishing or delivering further malicious content. No scripts were extracted, but the presence of the malicious URL is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://traffset.ru/123?utm_term=stuffed+animal+backpack+cute PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374177/normal_5fa68c10e9b2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420431/normal_5fa7789a05659.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404969/normal_5fb4b4e87fb3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369508/normal_5fa07fac691d8.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/8f354e55-28a1-4350-bd1b-2fbd374756a5/nadenemofuwan.pdfIn PDF document text
    • https://s3.amazonaws.com/daselex/71612970917.pdfIn PDF document text
    • https://s3.amazonaws.com/bexolamabad/29611012855.pdfIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/58322137712.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/fununabukeroburenarexeto.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_off0000cd0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0D 5332 bytes
SHA-256: 9d54f04c151a2e8f63d215c8ab9acf6cd15a1acd5fd9631ddedde2a5d9b24944
font_01_sfnt_off0000df23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF23 10120 bytes
SHA-256: f27626ac0cb1a09ca45f41879ae5ef23c13725d0558c4b6bd2a7de176811b143
font_02_sfnt_off00010202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10202 18528 bytes
SHA-256: bfb454934cc7c1e560fc82bbc0017a3216a1bda92c277ec668581ebf8ff3f2ee