Malicious PDF — malware analysis report

Static analysis result for SHA-256 999e4a014150ccda…

MALICIOUS

PDF

87.2 KB Created: 2021-09-12 18:45:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c17fd7a6a0e092e9f2d9fc342bf95731 SHA-1: d840fa19546005831b396c84b4d2d571e035b4f2 SHA-256: 999e4a014150ccda7c962b7f3d50b7a7172196d9ea29a83d9e7e5bdd12677a87
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains an embedded JavaScript stream and multiple external URIs, indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document is designed to redirect users to various potentially malicious websites. The ML classifier and ClamAV detection further confirm its malicious nature, likely involving exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://philabc.ru/uplcv?utm_term=best+free+porn+games+for+android PDF link annotation
    • https://congnghieptauthuyvietnam.vn/upload/files/wizexa.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/17712163774.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/16828897968.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/sitafemabadadanopizojenid.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/40098168773.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/91392314090.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/61074361426.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/nizusuwifu.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/fugototowus.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/20928396960.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db446704c1---36507272256.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/87727687181.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/bezebi.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/woninedonodo.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/54404918496.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/watuvan.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/62556453467.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/44492066197.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/75578128864.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/terafewebiximavujugeviz.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/sogodenonajukediguwoxil.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/4672992387.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fda2ab2f7f---bosutewa.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/gulimedekesirujasekenagev.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/678255843.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/nolajugivor.pdfIn PDF document text
    • http://wx-test.com/upload/ckimg/files/202109022015595015.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_off0000f1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A0 17172 bytes
SHA-256: 56315474310bffe76bf38f49c83057b711909f300bd30ecf6e60cf48053cf79b
font_01_sfnt_off00011df8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001360f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1360F 10848 bytes
SHA-256: b959f4428a5d6a482a4966792a79e644a5f8dc6749e8dc5ec64e641113093af5