Malicious PDF — malware analysis report

Static analysis result for SHA-256 01ce1ce85899631d…

MALICIOUS

PDF

80.7 KB Created: 2021-09-16 13:33:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 988c2e70114051f9d10c25d687f0d3c8 SHA-1: 4a9fbf6d282181c01626536c9b5024eb9c510932 SHA-256: 01ce1ce85899631d1512edeb034b83cbdb39de8bf66b138bd50a7a37c7ebc4ac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=free+rom+for+android PDF link annotation
    • http://patp1ryb.ru/media/file/zukotemofiwofufikilimusu.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/40345015752.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff456a16c1---93607796577.pdfIn PDF document text
    • https://subarini.ro/mm/file/vivikupelilelub.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/63297409121.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/2012125643.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/18982476088.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/75410078600.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/rirubixelojojemafa.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/28092952962.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/26687778762.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16135bb876bdce---63020730044.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/vodudawabopebiwulezisokil.pdfIn PDF document text
    • http://kennycojewelry.com/userfiles/files/202109/1630823563.pdfIn PDF document text
    • http://megatex-plast.ru/pub/file/18953866904.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/21992598658.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/78399030266.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/xuxosowevunojuxinomi.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/bakutojixodamul.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/zufilizixafazuriririgeta.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/jopin.pdfIn PDF document text
    • http://koutingchina.com/upload/files/17539409266.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/revaxonokuvemelusiguwipog.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/kekurelu.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/zodevif.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_off0000d755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD755 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6C 10180 bytes
SHA-256: 24ec157e32ab09fb986bf9ea54213e9d2883b811b649cf8cb16b28de5947c657
font_02_sfnt_off00010617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10617 18928 bytes
SHA-256: 9d22454295d239936e087a91f13f25c659dd4c1b60ebc838c260b376ef2d8c16

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