Malicious PDF — malware analysis report

Static analysis result for SHA-256 8790ee6ff6efa0f6…

MALICIOUS

PDF

93.2 KB Created: 2021-09-13 13:06:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f4bb285e6e2cd548327ecc179dcdc32a SHA-1: c93d13246ad415789dc1f216a85e73c4db1044e1 SHA-256: 8790ee6ff6efa0f6b3c06b3d8faec2823e305730c6bf5965ab1cfa5550ab6f93
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous external URIs, including one that appears to be a redirector with a 'fake steps pokemon go' UTM term, suggesting a phishing or scam lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the distribution of further malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=fake+steps+pokemon+go PDF link annotation
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/bokudedegewi.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/vinuxuvi.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/83651288721.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/47011885079.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/58265141547.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/wazudarutusej.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/xidupi.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/95002257639.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/lfamjpo1e6n1quq80eelphosp1/rijonamudupomuvijozamum.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/dokegelu.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/17605839465.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/rurevenisatiwevumeb.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/raziluwojebibetexugale.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/vuresawafukevimixaru.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/laduxufigojebipim.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210903103005.pdfIn PDF document text
    • http://wpchkg.com/upload/image/file/batebifor.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/46870524608.pdfIn PDF document text
    • http://bbbo.handyfriendship.com/upload/files/vimodug.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/32507827731.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16130072a48ccb---jobovukarevafekixi.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_off0001077c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077C 10424 bytes
SHA-256: 9f40d8c257a72949283890ed1bee2b752eb25f6649d3106966385747f5bf42ba
font_01_sfnt_off00011f24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F24 18440 bytes
SHA-256: 535378707e23c7ea0f070642c696c7f36c898c4670f4d72125aa971a50d34369
font_02_sfnt_off00014f5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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