Malicious PDF — malware analysis report

Static analysis result for SHA-256 fae3b8267519c925…

MALICIOUS

PDF

72.8 KB Created: 2021-09-17 11:05:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f60ba26c4c75daf75e65ba1a4fbf6d26 SHA-1: a3b8050e6c9dc0bb78ef71382fc981169eae9e44 SHA-256: fae3b8267519c925dbdcf923fe040b6d8842c35cc381b30341127668ff0b7a69
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and UTM parameters suggests an attempt to obscure the final destination and track campaign effectiveness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nbcmedia.vn/ckfinder/userfiles/files/ruvepujexamibare.pdf In PDF document text
    • https://shirbandifelt.com/userfiles/file/82008630735.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/47427465750.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210903205856_t60hk1.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/26712778265.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/fezerokegalusawe.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/54040097142.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/11376798058.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141b2749fce5---tazulixenitox.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/16831464625.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/mojapufunewuvoganop.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/nogoxab.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/97120333079.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210906_CE854ACF3CCF40C6.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/9623311847.pdfIn PDF document text
    • https://zagi.hr/files/negifiba.pdfIn PDF document text
    • http://poorclarescork.ie/images/4897635659.pdfIn PDF document text
    • http://giorgimpianti.com/userfiles/file/88365976193.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/tidopalufalodelefed.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/kedoverazuduxujobolo.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/giwudurokigolarajipow.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/27311542364.pdfIn PDF document text
    • https://pensionradvanice.cz/res/file/91856652116.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/jakudomugufe.pdfIn PDF document text
    • https://atiksigorta.com/files/gugizarojovo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=android+virenschutz+kostenlos+testPDF 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_off0000ba12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD224 16956 bytes
SHA-256: 3b1ff52e1ca533c4f72531e76d267d84463530af7bb70ceddf55c6b2049ee45a
font_02_sfnt_off0000fce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE4 10604 bytes
SHA-256: 9dc6c7775641b60f69e946edbca963f4eff0a2a89ec76a4a33ff589a2b6e9959

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