Malicious PDF — malware analysis report

Static analysis result for SHA-256 886228125a6da614…

MALICIOUS

PDF

77.3 KB Created: 2021-10-12 22:59:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2a4f8a0c07069fec1d98f5b282f32ea6 SHA-1: 568c53137742136d7ac39c5bdf5cc7656a9bde55 SHA-256: 886228125a6da614b435ecbe6baed938a2fe1fdaad777fcc901ef523c6daf637
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs pointing to disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. The embedded JavaScript likely facilitates the malicious activity, such as downloading further payloads or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://szallas-karpatalja.net/upload/87806142441.pdf In PDF document text
    • http://indcms.testingmachines.com/images/file/82952852373.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/woluxaziturusobepoxolel.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614473942993d---futafawoguvexe.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/56707511085.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/24319908491.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/80716412867.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/78142151716.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20219261358466223.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/zogodokinexefuruxadebip.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/jaruzavefa.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/tipemafebarubeg.pdfIn PDF document text
    • http://fgsconsulta.com.br/ckfinder/uploads/userfiles/files/zovufoxev.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/lutegosobaxoviwusifu.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/divanememolilofosup.pdfIn PDF document text
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/xabozutis.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/zoraxavunekezuwovogam.pdfIn PDF document text
    • http://apvn.info/userfiles/file/84240391547.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/xebaverutugito.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/jetizowojososixejeja.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/pimuduk.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/gijefedawuvuxinuzenofuk.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/25896926105.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/kuvezajep.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/49539396166.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/896FEnmJZlk/uplcv?utm_term=windows+7+apk+download+for+pcPDF 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_off0000cc27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC27 16732 bytes
SHA-256: f03d962e309a07fc61aefa4875158615585bc1fabab6b68afe11915fd405136d
font_01_sfnt_off0000f6bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED4 10604 bytes
SHA-256: d842e8c2ae679b5dda7bb8e1b7b864a923275251ff6555d359a6ac5d12af8f71