Malicious PDF — malware analysis report

Static analysis result for SHA-256 13700ce1edb30b6a…

MALICIOUS

PDF

69.2 KB Created: 2021-09-30 16:09:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ebb6a35e454a00fb242584fc82a38f45 SHA-1: 93575f646ca6617fdedf785a705633621267ef28 SHA-256: 13700ce1edb30b6a1298a57ddff8e1a457e48783f1c060883d16c437f0191f26
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and contains numerous external URIs. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates it functions as a link farm on disposable hosting, likely to distribute further malicious content or phish for credentials. Embedded JavaScript streams are also present, suggesting potential for further exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://coretry.ru/uplcv?utm_term=mengirim+file+dari+iphone+ke+android PDF link annotation
    • http://agnieszkapawlik.com/userfiles/file/kuvesuzuborinuzopabosi.pdfIn PDF document text
    • http://iuf.kr/pds_down/files/gefowimibozukikafidutev.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/7218440188.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/44138601167.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/5170405306.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/14859319355.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/65668406825.pdfIn PDF document text
    • http://bdsductri.com/upload/files/18258850099.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/29931335141.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/16840888426.pdfIn PDF document text
    • https://inprovitbrasil.com/ckfinder/userfiles/files/zexesutujomikosafibakuf.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/rowusufowikutoz.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/jugabujem.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/85825536459.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/86888743474.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/vagipotimepurofadunima.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/31875932369.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161383232ba4a3---jazekanupuzux.pdfIn PDF document text
    • http://thamcohoaian.com/webroot/img/files/31016659318.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/jajufewevajelo.pdfIn PDF document text
    • http://jcnjl.com/userfiles/files/59476437202.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/6eb6df6c886a28000402ad6e38de846c/perewufuvikojis.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55182097931.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_off0000b230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB230 14516 bytes
SHA-256: ea72f46d90c8a9fde5712c552e91ea79c660347bbf49fc25e623c9dd69f19b2c
font_01_sfnt_off0000d698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD698 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eeaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAF 10764 bytes
SHA-256: e94def435347d7d8d40b2ce8e62e1a52c7f53da5dbd2e7f7ccde5996d7f36440