Malicious PDF — malware analysis report

Static analysis result for SHA-256 a84e4c738e9b895f…

MALICIOUS

PDF

76.6 KB Created: 2021-04-03 13:56:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 67a5b73bd1adb5e258056d57246fce2d SHA-1: dea4eb19b4fed290c0541c619d77bec6055754e6 SHA-256: a84e4c738e9b895fdd3e8b58dcc3c3ec85b64f0d5594a7c423db724a67c9fa97
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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://midufefew.ru/strik?utm_term=mackie+control+universal+%2528mcu%2529+protocol PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460968/normal_605416aace05a.pdfIn PDF document text
    • http://paxezot.getenjoyment.net/somusitej.pdfIn PDF document text
    • http://sewawena.scienceontheweb.net/62335361704.pdfIn PDF document text
    • http://idealicait.site/sales_commission_agreement_template_california9rusl.pdfIn PDF document text
    • http://nujijaj.getenjoyment.net/kavavusopevo.pdfIn PDF document text
    • http://becloud.website/nipofufajopovoliwowego1dzm.pdfIn PDF document text
    • http://tapavinologo.mygamesonline.org/mutezadu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459029/normal_5fc6b4990f361.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374978/normal_601ad6e442133.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444657/normal_5ffc9befbcff5.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/wolina/nifubapazemoregoroninazef.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/tamifenakepiwajobanox.pdfIn PDF document text
    • https://s3.amazonaws.com/remavuj/html5_templates_with_css.pdfIn PDF document text
    • http://jozilaro.atwebpages.com/joxefoworag.pdfIn PDF document text
    • https://574dee49-ee40-4737-ae02-340ce2b26f9d.filesusr.com/ugd/b44cf7_ddfd63e8a53d41baa956a0b15661c8fe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nalifij/material_requisition_form_template_word.pdfIn PDF document text
    • https://s3.amazonaws.com/sefepugolupalax/what_is_a_carriage_return_in_html.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/square_and_rectangle_area_and_perimeter_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/retisovojor/levuleguwukorik.pdfIn PDF document text
    • https://s3.amazonaws.com/gimufesajo/55190270164.pdfIn PDF document text
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_e66cdcd82d144511bb7318360848ce5b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/62016548632.pdfIn PDF document text
    • https://s3.amazonaws.com/fedure/what_does_mecha_mean_in_japanese.pdfIn PDF document text
    • https://9e084d23-5bbf-42ad-98e9-fa9200f8584e.filesusr.com/ugd/4f663b_72027616debd4c41afaabe023aa3d07f.pdf?index=trueIn 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_off0000ec33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC33 5360 bytes
SHA-256: f8388e739fa7c5d8a06631202c9c5ea1b6d0714e848dc763b37e45f481cbcc26
font_01_sfnt_off0000fe7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7B 11240 bytes
SHA-256: 4c59c54040c31cd6ed48298c9bb31699df2aaf77ef71c7b895250c1dd901fdcd

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