Malicious PDF — malware analysis report

Static analysis result for SHA-256 05e7eecd5f152b58…

MALICIOUS

PDF

90.6 KB Created: 2021-02-25 06:39:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 11f8175a51fcc12dadf2019e8c1fec1a SHA-1: 671f4ad8d541be9f23e7330764a016e897c4d6fd SHA-256: 05e7eecd5f152b58dc004cd553f696516e5dbff982a26cc1ff5d61808fa6d7ab
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of numerous external URIs and the overall heuristic profile point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/123?utm_term=dante+purgatorio+canto+11+parafrasi PDF link annotation
    • http://limevekobo.iblogger.org/aqa_gcse_physics_hodder_textbook_answers.pdfIn PDF document text
    • http://bigswinner.space/health_psychology_dissertation_topics5y8qv.pdfIn PDF document text
    • https://cdn.sqhk.co/degavorofala/ggxVz8s/lefimejebogale.pdfIn PDF document text
    • https://cdn.sqhk.co/mifijizudi/igijc2t/48013305184.pdfIn PDF document text
    • https://cdn.sqhk.co/ritasuxa/hHwSH8x/pc_building_simulator_for_mac.pdfIn PDF document text
    • http://logivojem.22web.org/38614717578.pdfIn PDF document text
    • https://cdn.sqhk.co/lofopapenow/Vk7Aijd/gabukix.pdfIn PDF document text
    • http://xenipufuk.22web.org/bufojidupar.pdfIn PDF document text
    • https://cdn.sqhk.co/rikopekela/whbicgc/nixodaragibejolowo.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisidumes/xhbEvZN/wujidutavesezupa.pdfIn PDF document text
    • http://fifukeluforonis.22web.org/newejo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bosurigazo.epizy.com/std_guidelines_chlamydia.pdfIn PDF document text
    • https://s3.amazonaws.com/jodabiladezot/website_template_code_in_html.pdfIn PDF document text
    • http://xewaxal.epizy.com/pabevawobajan.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_off000124bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BC 5204 bytes
SHA-256: ab74a18f40d6b472034b51acd1023fe23a44c33a341f3ead3fb1208485570d2e
font_01_sfnt_off00013697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13697 11512 bytes
SHA-256: 34ff428544a32600c0210e4a5ed92b96008fa65fca52ce698d5e6300244123ce

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