Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5da9e0ae7aa84e0…

MALICIOUS

PDF

83.9 KB Created: 2021-09-12 19:19:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d25ed97c5e31527c5ecad6e42ceec07c SHA-1: 046a20df864d8f0c2f24c2b246dc89d104117f53 SHA-256: a5da9e0ae7aa84e06dd57ce1f3bc968f2932a8afbab27dcbc916b22f33ad02a3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs pointing to a link farm hosted on various domains, many of which are unknown or suspicious. The primary purpose appears to be directing users to these external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/joxikajofupunafin.pdf In PDF document text
    • http://lnhaihui.com/userfiles/file/20210905020403_505198591.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/setivimoronefiwolezule.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/lepubejidig.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c226a6c0ec---vafafegesexulek.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/zixigenorimotote.pdfIn PDF document text
    • http://chuabenhxuongkhop24h.com/images/files/21452838306.pdfIn PDF document text
    • https://fu-ko-property-agency.com/webroot/editor-uploads/files/40622150609.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/74441462911.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/d5d60159f4e429ddca07856f20a55f4d/tolufalitevoboxokamipaxa.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/xinivaxedetiwo.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/19526120317.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/64512029827.pdfIn PDF document text
    • https://n-tlg.com/files/file/fosawupajozemawubunesod.pdfIn PDF document text
    • https://manpowernepal.net/ckfinder/userfiles/files/57538121816.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///lebebugodate.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/nadoxepudigodajipujibar.pdfIn PDF document text
    • http://zlzljc.com/uploadfile/file///2021090816155130.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/resademoxuwikodukatoti.pdfIn PDF document text
    • https://finliz.lt/i/File/waririrakagexe.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/riridureruvanu.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/36624468051.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=animal+crossing+in+androidPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE628 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3F 10464 bytes
SHA-256: 7eb4addaf7ee2e50561c41ff4731aa271794d6d1eb488738cae8f76346411d60
font_02_sfnt_off000115b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B4 17344 bytes
SHA-256: 466144f196284302128bf59a7d6970311157abbefd3b3a79aa4249584cb2b0e9

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