Malicious PDF — malware analysis report

Static analysis result for SHA-256 870c8948f3cf7dd9…

MALICIOUS

PDF

82.1 KB Created: 2021-09-11 04:07:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e99291a7c6a8b42ccedd7f8b61d864c5 SHA-1: 1687fd224e2ede401dbbe7141d436f99a475996c SHA-256: 870c8948f3cf7dd9e1919af1726ca930bb75fa729cfc1d106e89e54b7357c529
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URIs and is described as a link farm on disposable hosting, suggesting it's part of a phishing or malware distribution campaign. The presence of embedded URLs and the PDF structure point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allytemp.ru/uplcv?utm_term=how+to+remove+no+sim+card+notification+android PDF link annotation
    • http://trieuduong.com/images/Download/remeziwowanovoku.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/gezuxelijaki.pdfIn PDF document text
    • http://dsagco.com/Upload/file/perejalulo.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/48182115886.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/95344316069.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/43612481342.pdfIn PDF document text
    • http://4yoga.by/pics/files/komefofebudas.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/meselalaxasuludinonatufo.pdfIn PDF document text
    • http://gfzgt.ch/upload/file/mimavat.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/vizugo.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/30853259639.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0317492001630826584.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/25021485331.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/raburulelazenabuni.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/vudoxapidiva.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/99893101692.pdfIn PDF document text
    • http://voijin.com/userfiles/files/65568717022.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/58738809326.pdfIn PDF document text
    • https://xistenze.nagydavid.com/files/files/mefegoruka.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/ronorixiwedu.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee399b7517---novizinosufomelosiwow.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/12945949045.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/7681005845.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fea6974989---95312536040.pdfIn PDF document text
    • 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_off0000da64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f27b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27B 10732 bytes
SHA-256: c45d1b610fca33c86433603714b987c88826a5c01c5ceb730944384c4905ce72
font_02_sfnt_off00010b2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2D 18292 bytes
SHA-256: a0ad5ef2ab65f67d05664f0122bbbf388d8ef64026e9fbed4dd6b76c5511490a

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