Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f73d98fb44704a5…

MALICIOUS

PDF

77.3 KB Created: 2021-04-07 00:07:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 8495c1eeacdaa5b326c2cbeffc2e3d4c SHA-1: ec19e4ca07a3baf9d80f5055528fd2126f12d81f SHA-256: 6f73d98fb44704a549d45503bc0e0f087c612401ccba84d4d6a5226f250f762f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users to potentially harmful sites. The ClamAV detection and ML classifier strongly indicate malicious content, specifically classified as phishing and trojan. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malicious redirection attack.

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 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://seumenha.ru/strik?utm_term=what+to+eat+for+breakfast+on+fodmap+diet PDF link annotation
    • https://mofutobanu.weebly.com/uploads/1/3/1/3/131383854/4298974.pdfIn PDF document text
    • https://ronumotesagazuw.weebly.com/uploads/1/3/4/3/134373959/fofetijiwetaxuz.pdfIn PDF document text
    • http://bekokax.getenjoyment.net/believing_is_seeing_creating_the_culture_of_art_free.pdfIn PDF document text
    • https://litunuvojiv.weebly.com/uploads/1/3/0/9/130969221/ba4f4d.pdfIn PDF document text
    • https://pikoxujedogusu.weebly.com/uploads/1/3/4/6/134665618/5311249.pdfIn PDF document text
    • https://lunidopufakim.weebly.com/uploads/1/3/4/4/134482460/leditujevogasida.pdfIn PDF document text
    • https://jexujomasok.weebly.com/uploads/1/3/5/3/135343442/binivujaxixibiwo.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/21f851bf-1cdc-4889-aeed-e53aaa3d3733/free_wordpress_themes_for_business_directory.pdfIn PDF document text
    • https://e6676b24-921d-4f57-8fca-beda98688f3c.filesusr.com/ugd/144d27_e7f2d685f1fd489b9f5f7dbe74c60d4f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/laravel_5._8_email_template.pdfIn PDF document text
    • https://s3.amazonaws.com/kabisebax/xafasekufovivituda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a533e9ab-2a3d-4926-8f3d-03d173317139/skyui_installed_but_not_working.pdfIn PDF document text
    • http://pigumomibi.onlinewebshop.net/bye_bye_blackbird.pdfIn PDF document text
    • https://s3.amazonaws.com/lanaladu/rs3_p2p_fletching_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/akkurat_light_free.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/47305365450.pdfIn PDF document text
    • https://3e1ae61b-6b68-46dc-8a90-d1c7a5b9f91c.filesusr.com/ugd/b8bbd7_6f792da6c89c43ce8d15bb7d93b8ec93.pdf?index=trueIn PDF document text
    • https://ae8c1479-5121-4009-b0ed-8259dbb1205b.filesusr.com/ugd/0aff45_4ff5fd72b9364b1e969f901a68392508.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b47a480-c9ce-407b-a9e8-ed60647a03d8/kowedokezogoniwe.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_off0000ee52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE52 5468 bytes
SHA-256: 62891c13ec2f5db90779b6214218e331ce4cce1834e47ccc30e516385bd340b1
font_01_sfnt_off000100c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C5 11860 bytes
SHA-256: 6b16f0f2317b9485085a211f0c9f618d9e2ddb808f7d056c8757f13c9b68889e

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