Malicious PDF — malware analysis report

Static analysis result for SHA-256 913cbeb0b965c257…

MALICIOUS

PDF

68.9 KB Created: 2021-02-14 06:42:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 00af4934454368a19894c63bad077d04 SHA-1: 014805ec98e976c2115c6a72dc5a059e7c1b79e0 SHA-256: 913cbeb0b965c2570e9f5b9ee5eb77902767872be29c13cf838d3bdb947f3ed0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains heuristics indicating it is a phishing lure, specifically prompting the user to install a browser extension or update. It also contains numerous external links, with one pointing to a potential landing page for malicious content. The ML classifier strongly flagged this PDF as malicious, and ClamAV detected it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://baarspo.ru/wb?keyword=roll20%20character%20sheet%20export PDF link annotation
    • http://cloudmarket.website/descriptive_essays_examplesnxuy2.pdfIn PDF document text
    • https://lefexaro.weebly.com/uploads/1/3/5/3/135324439/b9582442d69d.pdfIn PDF document text
    • https://sapofekotor.weebly.com/uploads/1/3/1/6/131637774/6916372.pdfIn PDF document text
    • https://kosodakugup.weebly.com/uploads/1/3/4/6/134655388/3816668.pdfIn PDF document text
    • https://rofixuninapo.weebly.com/uploads/1/3/5/3/135313709/lugovowaze.pdfIn PDF document text
    • http://mushygushysayings.com/78466835363dh5sl.pdfIn PDF document text
    • https://gaburidukir.weebly.com/uploads/1/3/4/4/134463400/nidof.pdfIn PDF document text
    • http://reduslim-shopufficiale.site/794624358369uf77.pdfIn PDF document text
    • http://mirror-x.org/chiari_malformation_support_groups_uk6ai1a.pdfIn PDF document text
    • https://zowukudikumo.weebly.com/uploads/1/3/1/3/131382828/853c4e9fddf3.pdfIn PDF document text
    • https://nuvarimo.weebly.com/uploads/1/3/1/3/131378817/menomoxelev_vepawarisupufaf.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/jixerubowi/armored_warfare_assault_free.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/atheros_ar9271_wireless_network_adapter_drivers.pdfIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/13891895279.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/business_plan_template_for_online_retail_store.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/49036531269.pdfIn PDF document text
    • https://s3.amazonaws.com/wowonesoribu/jolly_phonics_songs_free_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/kiwopusafize/xipan.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_off0000cfbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBF 5372 bytes
SHA-256: f2162eeed7e9f85a6798279b113bc297dcff6847a58af085be525f59af6dfb11
font_01_sfnt_off0000e201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE201 10832 bytes
SHA-256: 0bcb34c73bbe7c04424254edf80b022b7447dd85324dc9eacc6018d1bb6aa826

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