Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed08d40ddf1b4722…

MALICIOUS

PDF

71.3 KB Created: 2021-09-25 05:31:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: aa4f6f4af8f1e59b7b56bab8dd2fd15a SHA-1: 723b840cc4f3c5fa0b7814b1433f7dd15e616a89 SHA-256: ed08d40ddf1b4722c76a2ad8c79f2a1b128bd07e4e2ab7747bece416a23dae1f
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://a2designbg.com/userfiles/file/53561357509.pdf In PDF document text
    • https://coluer.ir/documents/file/salajabutikogeb.pdfIn PDF document text
    • https://service-panev.com/userfiles/8979097104.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/99218083809.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/wapewoxiwexum.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/347096115.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/7468310324.pdfIn PDF document text
    • https://equalitas.es/userfiles/file/45812800003.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/raxewoxiwamorizonan.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/72695998202.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/82d2684353fa84d0d7be9ba6f5cd57b3/46836179775.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614d42896182b---76591805682.pdfIn PDF document text
    • http://valosagoskincsesbanya.com/upload/file/xigijupufurewi.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/wadepoje.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210910102658.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/mexivajoj.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/penalagufifenawopuw.pdfIn PDF document text
    • https://diagoldjewels.com/userfiles/file/43413499461.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/rosemovefetegulezepofol.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/43078125539.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/63288995098.pdfIn PDF document text
    • http://madang.eu/f_pds/fck/file/44436042192.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/51023703464.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/48732891185.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/62759125249.pdfIn PDF document text
    • http://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/fakaziwire.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=online+video+converter+4kPDF 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_off0000b582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB582 10292 bytes
SHA-256: 674f7f107727d979cbbbfe5167c3a150620a44751c8faceef5471256ee3e1d04
font_01_sfnt_off0000ccd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD6 16464 bytes
SHA-256: 39aa713dfa19bde4df67215123cce5e43cdb0077a6a7670f25f23a58e58aeb6f
font_02_sfnt_off0000f721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF721 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1