Malicious PDF — malware analysis report

Static analysis result for SHA-256 769eab9ec93b08d8…

MALICIOUS

PDF

71.1 KB Created: 2021-02-27 17:22:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 18ed86e6cbfdd31ac08fc447d3c97126 SHA-1: 17e1071f0ee2a0066057ec2d1b4c1cf25e46c1e4 SHA-256: 769eab9ec93b08d8780de674f4df9a412d040b766de1b8fcfc894a4c40266d8b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ClamAV detection and ML classifier also strongly suggest malicious intent. The embedded URLs are likely used to redirect users to phishing sites or download further malware, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://golowaki.ru/wix?keyword=apk+editor+download+ios PDF link annotation
    • https://sizuzoxoxef.weebly.com/uploads/1/3/4/8/134846633/5157713.pdfIn PDF document text
    • http://eu-study.ru/wings_of_fire_book_8o2vxi.pdfIn PDF document text
    • https://siverogafexuj.weebly.com/uploads/1/3/4/0/134012696/sepofivawo.pdfIn PDF document text
    • http://spencermcman.us/weeknd_starboy_album_free_download39cki.pdfIn PDF document text
    • https://wekexodaxax.weebly.com/uploads/1/3/4/7/134713384/dewod.pdfIn PDF document text
    • http://cmbmarketing.agency/lazolila9safj.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/migivewuwe/ashoka_movie_filmyzilla.pdfIn PDF document text
    • http://nejesezape.myartsonline.com/universidad_del_tolima_programas_de_pregrado.pdfIn PDF document text
    • https://s3.amazonaws.com/tutasujal/compass_housing_application_form_darlington.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/althusser_essays_on_ideology.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/jowaxuwipofetizazov.pdfIn PDF document text
    • https://s3.amazonaws.com/widetunipet/31964084712.pdfIn PDF document text
    • http://sogivuwe.onlinewebshop.net/how_to_implement_baby_whisperer.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_off0000dbda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDA 5100 bytes
SHA-256: 900443b670a307987373d67c48795e935bd05a96ef94b8d6113138d5cdd7a619
font_01_sfnt_off0000ed52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED52 10184 bytes
SHA-256: e807007bd1b6ee70c1102f1944fdc39d13125389ad68c3925a0d06571c19a59e

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