Malicious PDF — malware analysis report

Static analysis result for SHA-256 c31ee3ffd0e8a1f8…

MALICIOUS

PDF

81.4 KB Created: 2021-10-04 21:17:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e200df3bbbff750391e2f27fc18f0ddb SHA-1: a21a3026b6bab787635f48feba636813b254bd23 SHA-256: c31ee3ffd0e8a1f8a83a019997cb762e40d879717b5bdab4b5e4c74320c060cb
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded content, though heavily obfuscated, are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://ajej.pretty-match.com/upload/files/solajolanas.pdf In PDF document text
    • https://isleo.com/i_photos/file/nufefekabexi.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/2924253f67b8b82d1a17fd79b8f99c12/zegidowexufajutijipo.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/razisefisadipolokuvuw.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/65476358971.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0a1427c4a---kitowesokefobajire.pdfIn PDF document text
    • https://minjar.mebel18.com/uploads/files/sogorexovewalo.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/24967829634.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/53840007555.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/luzunufekapozusuz.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/pudiluxizanedijikezoxafot.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/71201334855.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/58841945823.pdfIn PDF document text
    • https://worldtradezone.com/userfiles/file/90673412709.pdfIn PDF document text
    • http://guchen.ru/d/files/67619210659.pdfIn PDF document text
    • https://bazk.info/public_htmluploads/file/banarofusejitotonaziwilob.pdfIn PDF document text
    • https://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/bikisupujanemimoxigebit.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/zakoxeduzorodonotomab.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///vikosewipuzowal.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/11132565716.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/21951486885.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/retukin.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/vevufefewusuluwajole.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+trim+video+vlcPDF 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_off0000daba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D1 10240 bytes
SHA-256: 12d1c5b5eb8662308296a4210f6584551c75bbfc4cbce4f2660b09e8dcf86cd7
font_02_sfnt_off000109cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CB 17740 bytes
SHA-256: 3b800cb10ff3cb10689e3e89c0871d61c4c99de3f3f16a3f09043ae6505bd696

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