Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d52c33edd5d1481…

MALICIOUS

PDF

77.2 KB Created: 2020-11-23 13:03:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: b9bd1df5242600240b2a68dbeac33187 SHA-1: 1956d7d6ea5449baf5d2e4f4c5ee50ff12a0136f SHA-256: 9d52c33edd5d14816a6fac383b981fcff207a2e74c6e25dfd1ee9cd425e889ec
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that leads to a suspicious domain, identified by heuristics and ClamAV as malicious. The document body, though heavily obfuscated, appears to be related to a game guide, suggesting a social engineering lure. No scripts were extracted, but the presence of a malicious URL and the ML classifier's high confidence indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/aws?utm_term=slay+the+spire+ascension+15+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384143/normal_5f8bfd93a530a.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/dc287460-9855-4268-84cf-fd1c56d7ad9f/32417992495.pdfIn PDF document text
    • https://s3.amazonaws.com/xabalaru/anorexia_nerviosa_en_adolescentes.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/76562454742.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/22646533411.pdfIn PDF document text
    • https://s3.amazonaws.com/polojuliragam/41932584850.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/relieving_letter_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/98465419169.pdfIn PDF document text
    • https://s3.amazonaws.com/getizar/wafuregoz.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/80181472538.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_off0000ef36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF36 5716 bytes
SHA-256: 338ff524dff7474de4f0fcadd1ef41a846dfe13c749397ce149777a8018fcc59
font_01_sfnt_off000102b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B5 10960 bytes
SHA-256: b1b779f2253d78951454d14ade3de1c5a0ff051c545537c5a3ddf21ceb555e88

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