Malicious PDF — malware analysis report

Static analysis result for SHA-256 026de945ffe6da15…

MALICIOUS

PDF

75.4 KB Created: 2021-03-30 07:25:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5746460f44a55c98c307434ad78730bb SHA-1: 97d04fc3da96a2b377b4a50235e3afdffbc13513 SHA-256: 026de945ffe6da15f46c7f53f85844f27162d415464596245ccb8bf3f241ea10
196 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including a link farm and suspicious external links. The ML classifier and ClamAV detection strongly suggest this is a malicious PDF, likely used for phishing or distributing further malware. The embedded URLs point to suspicious domains, indicating a potential attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://jacksth.ru/strik?utm_term=john+deere+x320+snowblower+attachment
    • http://myirn.icu/rujudifuperibuxufujogeqzzrl.pdf
    • http://ig-supportcenter.xyz/40526952169i57ni.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/ganubifirigevi/gitulagiropinixamuve.pdf
    • https://uploads.strikinglycdn.com/files/b1c268b3-46fe-43a0-adf2-1a6a14ffd687/miller_millermatic_130xp_price.pdf
    • https://s3.amazonaws.com/vaxebisapesi/income_tax_reporting_portal.pdf
    • https://s3.amazonaws.com/jovekus/neferowifoza.pdf
    • http://pesixogid.rf.gd/544740170.pdf
    • http://gelunusa.epizy.com/totuvev.pdf
    • https://s3.amazonaws.com/gazitif/88387876409.pdf
    • https://s3.amazonaws.com/megulu/medicare_ambulatory_surgery_center_guidelines.pdf
    • http://nuxumejaxumem.epizy.com/57017525489.pdf
    • https://uploads.strikinglycdn.com/files/950c0bd7-8e59-4b33-b269-872e9c8909db/yamaha_natural_sound_av_receiver_rx-v473.pdf
    • https://ecf8b3bd-8201-449f-a39c-156acd88681e.filesusr.com/ugd/97634b_35d23dd2e88c41bbb538aca4b459e32f.pdf?index=true
    • https://s3.amazonaws.com/bibejovixapis/54460768278.pdf
    • https://s3.amazonaws.com/papuja/spring_boot_jdbctemplate_insert_example.pdf
    • https://034618a9-9b39-4f41-ad18-95bca1d1c80b.filesusr.com/ugd/48d9a1_d425697e2e3444b2b86a58e6fc2224af.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e67b.bin
a9f8ae1742a79f723ebc263ce2b5afb6071d03c2dcba6ada8cace28295e332ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE67B 5908 bytes
font_01_sfnt_off0000fa76.bin
99bee05c4540b9c1b8f98f8a92c4d7f3daec1826c4aad9af9abc2269e1cae58e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA76 11200 bytes

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