Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4f7d293f0cf6289…

MALICIOUS

PDF

78.7 KB Created: 2021-03-21 08:30:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 35a5da5faab8a5ac639ad5235592bcda SHA-1: 4a47950bac70fdb6a61a9d4e43278b4b4e58510f SHA-256: b4f7d293f0cf6289dd27d7a39fa29b1c1bbba43889e9c14ae53fcca2141ca833
126 Risk Score

Malware Insights

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

The PDF document contains numerous external URIs, many hosted on disposable domains or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a lure to external malicious content, likely for credential harvesting or further payload delivery.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://kuzutuzo.ru/123?utm_term=star+spangled+banner+sheet+music+saxophone PDF link annotation
    • https://sabutiwageb.weebly.com/uploads/1/3/5/9/135992853/geguzobatomafujobado.pdfIn PDF document text
    • https://padokerasuwo.weebly.com/uploads/1/3/5/3/135319223/884390.pdfIn PDF document text
    • https://jakilirimilibev.weebly.com/uploads/1/3/4/8/134862861/nixiwivobujarikiv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495269/normal_5ff43932e8a66.pdfIn PDF document text
    • http://wonamesavap.iblogger.org/photoshop_cs5_video_tutorials_free_download.pdfIn PDF document text
    • http://loxapul.iblogger.org/what_is_agile_software_development.pdfIn PDF document text
    • http://xubabutogazide.22web.org/mosizegawipoganowuw.pdfIn PDF document text
    • http://xunidar.iblogger.org/why_is_my_nespresso_milk_frother_flashing.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387702/normal_601327edf1a3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460461/normal_602d75fc1c109.pdfIn PDF document text
    • https://jarosebat.weebly.com/uploads/1/3/4/6/134695718/adf060ce53e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jamigiboweb.rf.gd/midland_gxt_1000_charger.pdfIn PDF document text
    • https://s3.amazonaws.com/kujesulad/14313283042.pdfIn PDF document text
    • http://pajuxiral.rf.gd/446152586.pdfIn PDF document text
    • http://vazozizid.epizy.com/que_es_un_editor_de_presentaciones_multimedia.pdfIn PDF document text
    • http://terajupatasan.rf.gd/57904929519.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/zofarova.pdfIn PDF document text
    • https://s3.amazonaws.com/gomaxod/17821150230.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/nuxetawewum.pdfIn PDF document text
    • http://nibewisule.epizy.com/agricultural_tax_exemption_form_south_carolina.pdfIn PDF document text
    • http://nofixuzupebo.epizy.com/multilingualism_in_education.pdfIn PDF document text
    • http://zuzinaxawalodi.epizy.com/vorepi.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_off0000f2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FA 5800 bytes
SHA-256: a071bf38ec3d43bc22ac4f66ff8c19d5c3ebcbb22bd517e351700dbdab3244be
font_01_sfnt_off00010689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10689 11328 bytes
SHA-256: d96dfc71140f9ed44aa58039538f648eae2de93b478e83a9797b6e60af3de740

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