Malicious PDF — malware analysis report

Static analysis result for SHA-256 d52752f4feaf7f40…

MALICIOUS

PDF

65.6 KB Created: 2020-12-20 13:58:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 46657fb78dbe4ee8ae4cb0073d14fddd SHA-1: d60ebddd0d385ff9e8d30ffc797bf64cb39ce21e SHA-256: d52752f4feaf7f40bfea6ec7919f8fb77ac419919cfa13bd372875556d6c6e0b
96 Risk Score

Malware Insights

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

The PDF file contains a heuristic indicating an external URI, specifically 'https://trafffe.ru/strik?utm_term=mills+park+middle+school'. This URL is associated with a phishing attempt, likely disguised as a school-related document to trick the user into visiting the malicious site. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=mills+park+middle+school PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366317/normal_5f8e41a91f1ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446038/normal_5fb5d251593ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381997/normal_5fdbe51f97412.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468823/normal_5fafd9c02be83.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/pukasojalu/florida_amendments_2020_pros_and_cons.pdfIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/hallelujah_piano_music_sheet_free.pdfIn PDF document text
    • https://s3.amazonaws.com/setigafat/89500209834.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/jurassic_park_movie_filmyzilla.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/meborimosiju.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_off0000c60c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC60C 5384 bytes
SHA-256: cf083775fea20deb38795c3cb10571a6a89fa356bb43283ec5813f76477aedd1
font_01_sfnt_off0000d837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD837 10060 bytes
SHA-256: 78b8348347ac9d15c1db38fdf02ffb13e828e6468cf6e54e7be8fdc400fc60f3

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