Malicious PDF — malware analysis report

Static analysis result for SHA-256 45a275466901f920…

MALICIOUS

PDF

78.9 KB Created: 2021-10-23 03:24:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9a5c66ed79c12f33c686bdf20e99f97f SHA-1: a31a4bfd8fca89e2714532fdaf77023faf902af9 SHA-256: 45a275466901f920b3591d0e2f92bcfd5f95176f06528e8e4fdcaa1ffb106196
134 Risk Score

Malware Insights

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

The PDF contains numerous links to external PDF files hosted on various domains, characteristic of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a 'download' button lure further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://aradovan.com/userfiles/file/vuzukawuvoripowuxivone.pdf In PDF document text
    • https://permargi.com/files/galeria/files/96727123848.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/4470155885.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/83788702793.pdfIn PDF document text
    • http://davcpundri.com/css/file/98529313440.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/moguvu.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/83031137055.pdfIn PDF document text
    • http://tochalco.com/uploads/files/togamozovuwejuwip.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/fefawaz.pdfIn PDF document text
    • http://isotech.si/uporabnik/file/mesifufifodu.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/39572039664.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16332030055930.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/64400173986.pdfIn PDF document text
    • https://sujatasfoodopolis.com/ckfinder/userfiles/files/27007682769.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/940641de6e26a6f634900ec8c26e49e0/defubawosid.pdfIn PDF document text
    • http://tomboy2.com/images/library/File/xolesire.pdfIn PDF document text
    • http://yilbasipromosyonu.com/userfiles/file/xavotebifelexib.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/66504700728.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/98774333143.pdfIn PDF document text
    • http://becskeicsodajo.hu/admin/fck_upload/file/31566939255.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/rofadodabujumidoloramipo.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/87659183773.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/xurodanomu.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/1hHberoKktI/uplcv?utm_term=cities+skylines+mods+for+ps4PDF 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_off0000d1cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E4 10812 bytes
SHA-256: 20fe2b6393b201cf440e981d7142eb27be74017f20cf7067c4454a5f95325888
font_02_sfnt_off000102d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D9 16984 bytes
SHA-256: 8c5304772c3ac76b3a76555de6f5aacd72da212f73d313d69f5ea41ac9277343

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