Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4d76870652c8a71…

MALICIOUS

PDF

80.4 KB Created: 2021-09-11 10:28:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3dcf0892b5b46abfef76d67f6b088800 SHA-1: 8d0c3d6363a5e43686338802c12492ea6ecf3c23 SHA-256: e4d76870652c8a71f285468351bc2bd73577e527cec51ab410c79d5ce664774d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a high density of external links, many pointing to disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://synerhu.ru/uplcv?utm_term=dls+2017+obb PDF link annotation
    • https://coaching-jk-academic.com/ckfinder/userfiles/files/muxonunofik.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/54872991315.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/43449099086.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/84117636563.pdfIn PDF document text
    • https://xcheck.vn/uploads/userfiles/file/38404433105.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/lofedibugulawijunexorezej.pdfIn PDF document text
    • https://dobski.pl/userfiles/file/63124431723.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/bavugisafefad.pdfIn PDF document text
    • http://4darchitecture.org/img/all/budusovijopivibikinu.pdfIn PDF document text
    • https://sanagustin.cl/files/ralazulezajupeki.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f91b962866---zajojop.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/wigitavigivolebup.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/5192921440.pdfIn PDF document text
    • http://tucholainfo.pl/userfiles/file/27589029177.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/15206385743.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/98652033037.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/dijaxi.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/vafuxosagenuke.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/70639594636.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/62832608527.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/36852297082.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/83195785023.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/kafadudofosibovoxasotivam.pdfIn PDF document text
    • https://pomacanthe-art.fr/imagebeforeafter/files/35516770235.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109021727344696.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/fogigikorubasul.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_off0000d063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD063 20580 bytes
SHA-256: cd7f8654aefa44f3b3e12469a8f4650d14a36978df52a92a9384f171dd06d362
font_01_sfnt_off00010633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10633 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E49 9896 bytes
SHA-256: 1d8c77cf6bc204ea881df19dff8b725664162dbe5f5150a8b4495cdbae461e3b